☆ 4.7 Review

Applications of bound states in the continuum in photonics

NATURE REVIEWS PHYSICS (2023)

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Article Multidisciplinary Sciences

Bound states in the continuum based on the total internal reflection of Bloch waves

Peng Hu et al.

Summary: This article elaborates on the formation mechanisms of bound states in the continuum in a photonic-crystal slab and develops a highly efficient solver based on total internal reflections of Bloch waves. A photonic-crystal slab can support bound states in the continuum (BICs) that have infinite lifetimes but are embedded into the continuous spectrum of optical modes in free space. The formation of BICs requires a total internal reflection (TIR) condition at both interfaces between the slab and the free space. The article shows that the TIR of Bloch waves can be directly obtained based on the generalized Fresnel equations proposed. A BIC solver with low computational complexity and fast convergence speed is developed, which can also work efficiently at high frequencies beyond the diffraction limit where multiple radiation channels exist. Two examples of multi-channel BICs are shown and their topological nature in momentum space is also revealed. The concept of the generalized TIR and the TIR-based BIC solver developed offer highly effective approaches for explorations of BICs that could have many potential applications in guided-wave optics and enhanced light-matter interactions.

NATIONAL SCIENCE REVIEW (2023)

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Article Multidisciplinary Sciences

Observation of intrinsic chiral bound states in the continuum

Yang Chen et al.

Summary: Photons with spin angular momentum possess intrinsic chirality, which has a wide range of applications. Current experimental attempts rely on false/extrinsic chirality, but this study has achieved true/intrinsic chiral response using resonant metasurfaces, achieving near-unity circular dichroism and a high quality factor for visible frequencies.

NATURE (2023)

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Review Optics

Nonlocal flat optics

Kunal Shastri et al.

Summary: 'Nonlocality' in electromagnetics and photonics refers to the dependence of a material or system's response/output at a certain point in space on the input field across an extended region of space. Nonlocal flat optics aims to exploit strong effective nonlocality to enhance the response of metasurfaces. This article summarizes the latest advances in this field, highlighting its fundamental principles and various applications, from optical computing to space compression. The convergence of local and nonlocal flat optics may revolutionize the control of light using ultra-thin platforms in real and momentum space.

NATURE PHOTONICS (2023)

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Article Physics, Multidisciplinary

Topological Unidirectional Guided Resonances Emerged from Interband Coupling

Xuefan Yin et al.

Summary: In this Letter, a mechanism to achieve unidirectional guided resonances (UGRs) through interband coupling effect and up-down symmetry breaking is reported. The topological nature of UGRs, including their generation, evolution, and annihilation, is investigated using phase winding numbers as topological indices. The findings provide new possibilities for light manipulation.

PHYSICAL REVIEW LETTERS (2023)

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Article Nanoscience & Nanotechnology

Resonant Chiral Effects in Nonlinear Dielectric Metasurfaces

Kirill Koshelev et al.

Summary: We study the resonant enhancement of linear and nonlinear chiroptical effects in planar silicon metasurfaces with an in-plane asymmetry supporting multipolar Mie resonances and quasi-bound states in the continuum (quasi-BICs). We demonstrate theoretically and observe in experiment the pronounced linear circular dichroism at the quasi-BIC resonances originating from the interaction of modes with the substrate. We further find that both local field enhancement and third-harmonic signal are large for Mie resonances and some quasi-BIC modes due to the critical coupling.

ACS PHOTONICS (2023)

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Article Chemistry, Physical

Intrinsic strong light-matter coupling with self-hybridized bound states in the continuum in van der Waals metasurfaces

Thomas Weber et al.

Summary: In this study, strong coupling in bound state in the continuum metasurfaces on nanostructured bulk WS2 is demonstrated, with sharp resonances, tailored linewidths, and controllable light-matter coupling strength.

NATURE MATERIALS (2023)

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Article Chemistry, Physical

Strongly enhanced light-matter coupling of monolayer WS2 from a bound state in the continuum

Eugenio Maggiolini et al.

Summary: In this study, strong light-matter interaction enhancement and large exciton-polariton nonlinearities at room temperature were demonstrated by combining a tungsten disulfide monolayer and a topologically protected bound state in the continuum formed by a one-dimensional photonic crystal. By optimizing for the electric-field strength at the monolayer position through Bloch surface wave confinement, a 100 meV photonic bandgap with the bound state in the continuum and a Rabi splitting of 70 meV were achieved in a fully open architecture. This architecture opens up possibilities for polariton devices based on topologically protected and highly interacting bound states in the continuum.

NATURE MATERIALS (2023)

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Article Physics, Multidisciplinary

Hyperparametric Oscillation via Bound States in the Continuum

Fuchuan Lei et al.

Summary: Optical hyperparametric oscillation based on the third-order nonlinearity is a significant mechanism to generate coherent electromagnetic radiation and produce quantum states of light. Advances in dispersion-engineered high-Q microresonators have allowed for generating signal waves far from the pump and decreasing the oscillation power threshold. However, the efficiency and absolute power of the pump-to-signal conversion are limited by parasitic mode competition and the achievable cavity intrinsic Q to coupling Q ratio.

PHYSICAL REVIEW LETTERS (2023)

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Article Physics, Multidisciplinary

Universal Mirror-Stacking Approach for Constructing Topological Bound States in the Continuum

Luohong Liu et al.

Summary: We propose a simple but universal mirror-stacking approach to turn nontrivial bound states of any topological monolayer model into topological bound states with extraordinary robustness. By tuning the interlayer couplings, the topological bound state of one subspace can move into and out of the continuum of the other subspace continuously without hybridization. We construct one-dimensional first-order and two-dimensional higher-order topological bound states and demonstrate them unambiguously by acoustic experiments.

PHYSICAL REVIEW LETTERS (2023)

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Article Multidisciplinary Sciences

High-efficiency nonlocal reflection-type vortex beam generation based on bound states in the continuum

Tongyu Li et al.

Summary: A guideline for designing high-efficiency nonlocal reflection-type vortex generators based on temporal-coupled-mode theory is proposed. The conversion efficiency of vortex beams is limited by the ratio of radiative loss to intrinsic absorption in practical systems.

NATIONAL SCIENCE REVIEW (2023)

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Article Materials Science, Multidisciplinary

Experimental Observation of Vector Bound States in the Continuum

Huizhen Zhang et al.

Summary: This study theoretically designs and experimentally realizes vector bound states in the continuum (BICs) in photonic crystal (PhC) slabs, overcoming the limitation of current BICs implementations restricted to surface-enhanced applications. The results show that symmetry-protected vector BICs can be achieved by tuning the geometric parameters of PhC slabs, generating homogeneous superchiral fields three orders of magnitude larger than circular polarized lights, which can have important applications in ultrasensitive detections of molecular chirality.

ADVANCED OPTICAL MATERIALS (2023)

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Article Nanoscience & Nanotechnology

Increasing the Q-Contrast in Large Photonic Crystal Slab Resonators Using Bound-States-in-Continuum

Ming Zhou et al.

Summary: Photonic-crystal surface-emitting lasers (PCSELs) have potential for large-area single-mode lasers. However, the scaling challenge in increasing PCSEL area while preserving single-mode operation has hindered progress. This study shows that the existence of bound states in the continuum (BIC) can overcome this challenge by enabling a large and constant Q-contrast independent of crystal size. An analytical theory and full-wave simulations confirm the size-invariant Q-contrast enabled by BIC. The study also suggests increasing Q-contrast by introducing specific spatial nonuniformities, opening new possibilities for ultralarge-area PCSEL design.

ACS PHOTONICS (2023)

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Review Physics, Applied

Free-electron-light interactions in nanophotonics

Charles Roques-Carmes et al.

Summary: When free electrons impinge on optical structures or pass nearby, they emit electromagnetic radiation called cathodoluminescence. These effects have been extensively studied in high-energy physics, but recent progress in nanophotonics has led to new applications in shaping and controlling free-electron radiation. In this review, we present a unified framework for understanding free-electron light-matter interaction and discuss experimental techniques for characterizing and controlling free-electron radiation in nanophotonic systems. We also outline future directions for this field, including ultrafast and quantum effects, tunable short-wavelength emitters, and free-electron radiation from topological states.

APPLIED PHYSICS REVIEWS (2023)

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Article Multidisciplinary Sciences

High-harmonic generation from a subwavelength dielectric resonator

Anastasiia Zalogina et al.

Summary: Higher-order optical harmonics have been observed in nanostructured solids such as optical gratings and metasurfaces. By structuring materials at the subwavelength scale, we can enhance nonlinear processes and reduce the size of high-harmonic sources. In our study, we generated up to a seventh harmonic from a single subwavelength resonator made of AlGaAs material. This was achieved by carefully engineering the resonator geometry and exciting the resonant modes with an azimuthally polarized tightly focused beam.

SCIENCE ADVANCES (2023)

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Article Chemistry, Multidisciplinary

High-Q Nanophotonics over the Full Visible Spectrum Enabled by Hexagonal Boron Nitride Metasurfaces

Lucca Kuehner et al.

Summary: All-dielectric optical metasurfaces with high-Q resonances throughout the visible spectrum have been achieved by leveraging symmetry-broken quasi bound states in the continuum (qBICs). These qBIC resonances effectively suppress radiation losses, allowing for the use of low-index van der Waals materials such as hexagonal boron nitride (hBN). The experimental results also demonstrated enhanced second-harmonic generation using the high-Q resonances.

ADVANCED MATERIALS (2023)

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Article Optics

Second-Harmonic Generation in Etchless Lithium Niobate Nanophotonic Waveguides with Bound States in the Continuum

Fan Ye et al.

Summary: This article reports the experimental results of second-harmonic generation from telecom to near-visible wavelengths using a photonic bound state in the continuum (BIC) on an etchless lithium niobate platform. These results are of great significance in the field of nonlinear integrated photonics and can be applied to on-chip applications such as optical parametric generation, signal processing, and quantum photonics.

LASER & PHOTONICS REVIEWS (2022)

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Review Nanoscience & Nanotechnology

Advances and applications of nanophotonic biosensors

Hatice Altug et al.

Summary: This Review presents the progresses in label-free nanophotonic biosensors based on photonic or dielectric surfaces and metasurfaces, and discusses their challenges and benefits in the fields of public health, well-being, and biosafety. Nanophotonic devices can control light and enhance light-matter interactions at subwavelength scales, offering exciting prospects for biosensing applications.

NATURE NANOTECHNOLOGY (2022)

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Article Physics, Multidisciplinary

Bound States in the Continuum in Compact Acoustic Resonators

Ilya Deriy et al.

Summary: Finite-size solid acoustic resonators are found to support genuine bound states in the continuum (BICs) localized inside the resonator, which can be classified based on multipole theory. Breaking the symmetry of the resonator leads to quasi-BICs, reflected as high Q Fano resonances in the scattering spectra. These novel states have significant implications for pushing the performance limits of acoustic devices and serving as high-Q building blocks for acoustic sensors, antennas, and topological acoustic structures.

PHYSICAL REVIEW LETTERS (2022)

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Article Materials Science, Multidisciplinary

High-Harmonic Optical Vortex Generation from Photonic Bound States in the Continuum

Lei Kang et al.

Summary: Momentum-space polarization vortices in photonic structures based on BICs can generate optical vortex beams, while harmonic generation from nanostructures exhibits a nonlinear geometric phase. Third- and fifth-harmonic optical vortex generation from an amorphous silicon photonic crystal slab has been numerically demonstrated, showing that the topological charge of the nth-harmonic OV beams follows a certain pattern determined by the nonlinearity phase. By exploiting harmonic multiplexing, the channel capacity of OV generators based on topologically protected optical BICs can be significantly improved.

ADVANCED OPTICAL MATERIALS (2022)

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Article Materials Science, Multidisciplinary

Realization of Polaritonic Topological Charge at Room Temperature Using Polariton Bound States in the Continuum from Perovskite Metasurface

Nguyen Ha My Dang et al.

Summary: Exciton-polaritons are hybrid excitations resulting from the strong coupling between an active excitonic material and photonic resonances. The experimental investigation of the formation of polariton BICs, arising from the mixing between hybrid inorganic-organic perovskite excitons and an optical bound state in a continuum, confirms the transfer of the topological nature of the photonic BIC to the polariton BIC, paving the way for room temperature polaritonic devices.

ADVANCED OPTICAL MATERIALS (2022)

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Article Nanoscience & Nanotechnology

High-Harmonic Generation from Resonant Dielectric Metasurfaces Empowered by Bound States in the Continuum

George Zograf et al.

Summary: This study introduces the concept of BICs to the field of high-harmonic generation and uses resonant dielectric metasurfaces to efficiently generate optical harmonics up to the 11th order, including the observation of a transition to the nonlinear regime. This research bridges the fields of perturbative and nonperturbative nonlinear optics at the subwavelength scale.

ACS PHOTONICS (2022)

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Observation of miniaturized bound states in the continuum with ultra-high quality factors

Zihao Chen et al.

Summary: This study presents a compound method that combines lateral mirrors and bound states in the continuum to achieve on-chip optical cavities with high quality factors and small modal volumes. Unlike traditional methods, this approach enables light trapping in all three dimensions and demonstrates high quality factors and low modal volumes.

SCIENCE BULLETIN (2022)

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Excitonic devices with van der Waals heterostructures: valleytronics meets twistronics

Alberto Ciarrocchi et al.

Summary: 2D semiconducting transition metal dichalcogenides are a promising class of materials that have unique properties, including large exciton binding energies. The ability to control interlayer excitons in van der Waals heterostructures provides opportunities for spin and valley degree of freedom manipulation in solid-state devices. This review discusses recent progress in device architectures and engineering techniques for tailored properties of interlayer excitons.

NATURE REVIEWS MATERIALS (2022)

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Schrodinger's red pixel by quasi-bound-states-in-the-continuum

Zhaogang Dong et al.

Summary: A study has found that the design of nanoantennas can achieve saturated and bright red colors with high reflectance, surpassing traditional red pigments. This design also has potential applications in information encryption.

SCIENCE ADVANCES (2022)

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Article Multidisciplinary Sciences

Polariton Bose-Einstein condensate from a bound state in the continuum

V Ardizzone et al.

Summary: This study discovered bound states in the continuum (BICs) in a planar photonic crystal lattice, which have a long lifetime and are not affected by radiation. The researchers also demonstrated non-equilibrium Bose-Einstein condensation occurring in the BIC. By combining bosonic condensation and symmetry-protected radiation eigenmodes, they showed a way to impart topological properties onto macroscopic quantum states.

NATURE (2022)

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Review Optics

High harmonic generation in condensed matter

Eleftherios Goulielmakis et al.

Summary: When solids are exposed to intense laser fields, nonlinear optics occurs and high-order harmonics are emitted from the bulk of materials. The study of this phenomenon has offered new possibilities for probing the electronic structure of solids and has led to advances in solid-state photonics. This review summarizes recent experimental and theoretical progress in this field and discusses potential future directions and applications.

NATURE PHOTONICS (2022)

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Can Weak Chirality Induce Strong Coupling between Resonant States?

Yang Chen et al.

Summary: This study demonstrates strong coupling between quasibound states in the continuum of a high-Q metasurface, assisted with externally introduced enantiomers of weak chirality. A chirality-involved Hamiltonian is established to quantitatively describe the correlation between the coupling strength and the chirality of such systems, providing an insightful recipe for enhancing the coupling of resonant states further in the presence of quite weak chirality. The findings present a distinct strategy for manipulating optical coupling between resonances, revealing opportunities in chiral sensing, topological photonics, and quantum optics.

PHYSICAL REVIEW LETTERS (2022)

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Tunable structured light with flat optics

Ahmed H. Dorrah et al.

Summary: Flat optics, with its subwavelength resolution, ease of integration, and compact design, has become a crucial player in the field of structured light and its applications. The new generation of meta-optics can shape the light and dark features of an optical field with unprecedented complexity and multifunctionality. These advancements have the potential to revolutionize camera systems, microscopes, holography, portable devices, and wearable technology, and may also open up new possibilities in optical communications and sensing.

SCIENCE (2022)

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Highly efficient nonlinear optical emission from a subwavelength crystalline silicon cuboid mediated by supercavity mode

Mingcheng Panmai et al.

Summary: The low quantum efficiency of silicon has been a long-standing challenge. In this study, scientists proposed a strategy to modify the carrier dynamics in silicon nanoparticles by exploiting the intrinsic excitation of carriers at high temperatures. They observed a significant improvement in quantum efficiency by injecting dense electron-hole plasma via two-photon-induced absorption.

NATURE COMMUNICATIONS (2022)

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Article Nanoscience & Nanotechnology

Boundary-Induced Embedded Eigenstate in a Single Resonator for Advanced Sensing

Rasmus E. Jacobsen et al.

Summary: This work demonstrates the localization of embedded eigenstates, also known as bound states in the continuum (BICs), in a single subwavelength resonator by suitably tailoring the boundaries around it, leading to a new level of control for symmetry breaking. Experimental results show that boundary-induced BICs can be used to trace highly subwavelength perturbations in tiny water droplets, providing exciting opportunities for sensing.

ACS PHOTONICS (2022)

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Review Nanoscience & Nanotechnology

Emerging exciton physics in transition metal dichalcogenide heterobilayers

Emma C. Regan et al.

Summary: This Review discusses two approaches for realizing emergent excitonic physics in two-dimensional semiconductor heterostructures: the introduction of a moire superlattice and the formation of an optical cavity.

NATURE REVIEWS MATERIALS (2022)

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Review Physics, Multidisciplinary

Nanophotonic nonlinear and laser devices exploiting bound states in the continuum

Min-Soo Hwang et al.

Summary: This article reviews the recent progress in the development of nanophotonic devices using bound states in the continuum (BICs), which have high quality factors and spatial confinement. The suppression of cavity radiative losses enables strong nonlinear optical responses or low-power operation. Harnessing the long-lived, spatially-confined BICs has emerged as a promising approach to enhance nanophotonic quality factors. The article discusses the formation mechanisms of various types of BICs and reviews their recent applications in passive and active nanophotonic devices.

COMMUNICATIONS PHYSICS (2022)

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Article Physics, Multidisciplinary

Spin Hall Effect of Light via Momentum-Space Topological Vortices around Bound States in the Continuum

Jiajun Wang et al.

Summary: We theoretically propose and experimentally demonstrate the spin Hall effect of light in photonic crystal slabs using momentum-space topological vortices around BICs. Our findings reveal spin-related topological effects around BICs, opening up possibilities for the application of BICs in integrated spin-optical devices and information processing.

PHYSICAL REVIEW LETTERS (2022)

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Article Physics, Multidisciplinary

Extended State in a Localized Continuum

Wei Wang et al.

Summary: This Letter reports the discovery of an extended state in a localized continuum (ELC), which is an inversion of the bound state in a continuum (BIC). The ELC is a single extended state embedded in a continuous spectrum entirely consisting of localized modes. The emergence of ELC is due to the interplay between the BIC and the non-Hermitian skin effect (NHSE), and its realization has been experimentally demonstrated using an active mechanical lattice.

PHYSICAL REVIEW LETTERS (2022)

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Article Optics

Global phase diagram of bound states in the continuum

Peng Hu et al.

Summary: This study classifies different types of bound states in the continuum (BICs) in photonic-crystal slabs and reveals the origin of these BICs. It shows that single-resonance parametric BICs are formed through the coupling of guided resonance and Fabry-Perot modes, while symmetry-protected BICs are formed through the coupling of degenerate guided resonance modes. A global phase diagram of BICs can be obtained based on this classification, and phase transitions can be observed when BICs are created or annihilated.

OPTICA (2022)

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Article Optics

Diffractive Nonlocal Metasurfaces

Adam Overvig et al.

Summary: Metasurfaces have the potential to control optical wavefronts in a multifunctional way, thanks to recent advances in their frequency response control. By leveraging diffractive nonlocal metasurfaces, which use controlled geometric perturbations, ultrasharp optical responses can be achieved. This novel class of metasurfaces allows for both wavefront shaping and wavefront selectivity, offering new prospects for various applications.

LASER & PHOTONICS REVIEWS (2022)

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Article Multidisciplinary Sciences

Plasmonic bound states in the continuum to tailor light-matter coupling

Andreas Aigner et al.

Summary: Researchers have designed and successfully fabricated plasmonic nanofin metasurfaces, which play a crucial role in nanophotonics. By manipulating the geometric parameters, they achieved high-quality factor modes and demonstrated powerful performance in molecular sensing. The precise control of light-matter interactions is essential in this study. This research provides a new approach for enhancing light-matter interactions in various applications.

SCIENCE ADVANCES (2022)

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Article Multidisciplinary Sciences

Low-threshold nanolasers based on miniaturized bound states in the continuum

Yuhao Ren et al.

Summary: This research combines bound states in the continuum and photonic bandgaps to achieve miniaturized light confinements, demonstrating compact lasers with high-quality factors. The study is important for achieving compact BIC lasers with ultralow power consumption.

SCIENCE ADVANCES (2022)

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Article Multidisciplinary Sciences

Scalable single-mode surface-emitting laser via open-Dirac singularities

Rushin Contractor et al.

Summary: In this study, the authors propose and demonstrate the existence of open-Dirac electromagnetic cavities that exhibit scale invariant single-mode lasing. The physical mechanism behind this phenomenon lies in the convergence of the complex part of the free spectral range in open-Dirac cavities towards a constant, determined by the loss rates of different Bloch bands. The authors name these sources Berkeley surface-emitting lasers (BerkSELs) and show that their far-field corresponds to a topological singularity of charge two.

NATURE (2022)

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Article Physics, Multidisciplinary

Moire Quasibound States in the Continuum

Lei Huang et al.

Summary: This study combines the concept of moire structures in twisted bilayer photonic crystal slabs with the notion of bound states in the continuum (BICs) to create a new optical state, referred to as moire quasi-BIC. It demonstrates that this state possesses characteristics of moire flat bands and quasi-BICs. The research also explores the mechanism behind the formation of moire flat bands and shows that decreasing the twist angle can lead to a near-perfect BIC with significantly reduced radiation loss. Additionally, it highlights the advantage of moire quasi-BICs in enhancing second-harmonic generation (SHG) compared to dispersive quasi-BICs.

PHYSICAL REVIEW LETTERS (2022)

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Article Optics

Multifunctional resonant wavefront-shaping meta-optics based on multilayer and multi-perturbation nonlocal metasurfaces

Stephanie C. Malek et al.

Summary: We experimentally demonstrate nonlocal dielectric metasurfaces that provide both spatial and spectral control over light, focusing light exclusively over a narrowband resonance. We also realize a versatile platform for multispectral wavefront shaping, applicable in augmented reality and transparent displays.

LIGHT-SCIENCE & APPLICATIONS (2022)

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Article Multidisciplinary Sciences

Resonant metasurfaces for generating complex quantum states

Tomas Santiago-Cruz et al.

Summary: This study demonstrates the generation of entangled photons through spontaneous parametric downconversion in semiconductor metasurfaces with high-quality factor and quasi-bound state in the continuum resonances. The metasurfaces enhance the quantum vacuum field, leading to the emission of nondegenerate entangled photons in multiple narrow resonance bands and over a wide spectral range. By pumping a single resonance or multiple resonances at different wavelengths, multifrequency quantum states, including cluster states, can be generated.

SCIENCE (2022)

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Article Multidisciplinary Sciences

Chiral emission from resonant metasurfaces

Xudong Zhang et al.

Summary: Ultracompact sources of circularly polarized light are important for both classical and quantum optical information processing. The efficient and controllable emission of circularly polarized light from resonant metasurfaces using the physics of chiral quasi-bound states in the continuum has been demonstrated, promising multiple applications in nanophotonics and quantum optics.

SCIENCE (2022)

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Article Multidisciplinary Sciences

Radial bound states in the continuum for polarization-invariant nanophotonics

Lucca Kuehner et al.

Summary: The authors have developed a nanophotonic platform for enhanced on-chip biomolecular sensing and nonlinear light generation. This platform features high-Q resonances and a small spatial footprint. They have successfully demonstrated its applications in sensitive biomolecular detection and enhanced second-harmonic generation.

NATURE COMMUNICATIONS (2022)

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Article Materials Science, Multidisciplinary

Electrically Tunable and Robust Bound States in the Continuum Enabled by 2D Transition Metal Dichalcogenide

Chen Zhao et al.

Summary: High quality factor (Q-factor) resonance can enhance light-matter interactions, but fabrication imperfections and material impurities limit its performance. Manipulating merging bound states in the continuum (BICs) by electrically tuning material properties offers a solution for optimizing on-chip photonic devices.

ADVANCED OPTICAL MATERIALS (2022)

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Article Materials Science, Multidisciplinary

Fabry-Perot bound states in the continuum in an anisotropic photonic crystal

Stepan V. Nabol et al.

Summary: In this study, a non-uniform photonic crystal with two anisotropic defect layers is investigated, and it is demonstrated that the system can support a Fabry-Perot bound state in the continuum (FP-BIC) in a continuous medium.

PHYSICAL REVIEW B (2022)

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Review Physics, Applied

Non-Hermitian topology and exceptional-point geometries

Kun Ding et al.

Summary: Non-Hermitian theory is a theoretical framework used to describe open systems, featuring unique mathematical structures and topological properties. It accurately describes the degrees of freedom and interactions of a system with the external environment, and has significant implications in applications. This Review provides an overview of non-Hermitian topology and discusses recent developments in the field.

NATURE REVIEWS PHYSICS (2022)

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Article Physics, Multidisciplinary

Magic configurations in moir? superlattice of bilayer photonic crystals: Almost-perfect flatbands and unconventional localization

Dung Xuan Nguyen et al.

Summary: In this study, the physics of photonic band structures in moire patterns formed by overlapping two unidimensional photonic crystal slabs with mismatched periods is investigated. The system's band structure is determined by the interplay between intralayer and interlayer coupling mechanisms, which can be adjusted by varying the distance between the two layers. An effective Hamiltonian is derived that accurately reproduces all numerical simulations of electromagnetic solutions. Magic distances corresponding to the emergence of photonic flatbands within the entire Brillouin zone of the moire superlattice are observed. Furthermore, a single-band tight-binding model is proposed to describe the moire minibands, with the tunneling rate tunable via the interlayer strength. The results demonstrate that the band structure of bilayer photonic moire can be engineered in a similar way to electronic/excitonic counterparts.

PHYSICAL REVIEW RESEARCH (2022)

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Article Materials Science, Multidisciplinary

Unfolded band structures of photonic quasicrystals and moire superlattices

Yanbin Zhang et al.

Summary: This article applies the band-unfolding approach to investigate the dispersions of different types of photonic quasiperiodic structures, including highly-rotational symmetric photonic quasicrystals lacking translational symmetry, and moire superlattices formed by twisting two primary lattices. The band-unfolding approach offers a simple visualization of the band structure of these quasiperiodic structures, which can be directly compared with experimental results. This approach is envisioned to be a fundamental method for introducing the rich concepts of photonics in condensed-matter physics to photonic quasiperiodic systems.

PHYSICAL REVIEW B (2022)

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Article Nanoscience & Nanotechnology

Dielectric Metasurfaces Enabling Advanced Optical Biosensors

Ming Lun Tseng et al.

Summary: Dielectric metasurfaces have emerged as a powerful platform for novel optical biosensors, demonstrating low optical loss and strong light-matter interactions. Their unique characteristics enable the advancement of cutting-edge sensing techniques for new applications, with a promising future in research and development.

ACS PHOTONICS (2021)

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Article Nanoscience & Nanotechnology

Active nonlocal metasurfaces

Stephanie C. Malek et al.

Summary: Optical metasurfaces for wavefront shaping face challenges in actively tuning and reconfiguring wavefronts, with nonlocal metasurfaces functioning based on modes supported by adjacent meta-units. These nonlocal metasurfaces can produce sharp spectral features but typically lack spatial control of the outgoing wavefront. Leveraging enhanced light-matter interactions associated with sharp Fano resonances, active modulation of optical spectra and wavefronts can be explored without the need for unusual materials and fabrication or active control of individual meta-units.

NANOPHOTONICS (2021)

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Article Chemistry, Multidisciplinary

Optical Bound States in Continuum in MoS2-Based Metasurface for Directional Light Emission

Naseer Muhammad et al.

Summary: The study investigates bound states in the continuum (BIC) in a Mie nanoresonator based on MoS2, revealing the existence of symmetry protected BIC and quasi-BIC (q-BIC).

NANO LETTERS (2021)

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Article Chemistry, Multidisciplinary

Low-Loss Zero-Index Materials

Haoning Tang et al.

Summary: This study reduces losses in zero-index on-chip photonic crystals by introducing high-Q resonances, achieving an order-of-magnitude reduction in propagation loss at near-infrared wavelengths. This work presents a viable approach to fabricate low-loss zero-index on-chip nanophotonic devices.

NANO LETTERS (2021)

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Article Optics

Ultra-low-loss on-chip zero-index materials

Tian Dong et al.

Summary: The researchers have designed a zero-index medium with ultra-low loss, capable of achieving zero refractive index at the telecommunications wavelength. This material can be used in nonlinear and quantum optics applications, benefiting from infinite coherence length.

LIGHT-SCIENCE & APPLICATIONS (2021)

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Article Optics

Enhanced Strong Coupling of TMDC Monolayers by Bound State in the Continuum

Ibrahim A. M. Al-Ani et al.

Summary: Strong coupling between excitons in TMDC monolayers and resonators can be achieved by adjusting parameters such as grating angle and TMDC monolayer position, leading to significant Rabi-splitting.

LASER & PHOTONICS REVIEWS (2021)

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Article Chemistry, Multidisciplinary

Topological Control of 2D Perovskite Emission in the Strong Coupling Regime

Seongheon Kim et al.

Summary: By exploiting momentum space topology, topological control of 2D perovskite emission in the strong coupling regime via polaritonic bound states in the continuum (BICs) is demonstrated, with observation of polarization singularities and achieving high degree of circular polarization in symmetry-broken structures. Lower polariton modes shifting to low-loss spectral region in strong coupling regime results in strong emission enhancement and large degree of circular polarization.

NANO LETTERS (2021)

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Review Multidisciplinary Sciences

Excitons and emergent quantum phenomena in stacked 2D semiconductors

Nathan P. Wilson et al.

Summary: This review discusses the exciton physics of transition metal dichalcogenides, focusing on moire patterns and exciton many-body physics, and outlines future research directions in the field. The design and control of material interfaces are foundational for realizing technologically useful effects and engineering material properties, especially in two-dimensional materials.

NATURE (2021)

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Article Physics, Multidisciplinary

Dynamics of Topological Polarization Singularity in Momentum Space

Yixuan Zeng et al.

Summary: The study uncovers polarization singularities in momentum space, revealing topological features in photonic crystal slabs such as vortex eigenpolarization singularities and circular polarization points. It explores the processes of asymmetric generation and annihilation of C points, as well as topological phenomena related to radiative lifetimes.

PHYSICAL REVIEW LETTERS (2021)

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Article Physics, Multidisciplinary

Evolution and Nonreciprocity of Loss-Induced Topological Phase Singularity Pairs

Mengqi Liu et al.

Summary: The paper demonstrates the origin, evolution, and application of topological phase singularity pairs (TPSPs) resulting from BICs in nonreciprocal and non-Hermitian systems. The nonreciprocity contributes to creating accidental BICs asymmetrically, each of which can split into TPSP with topological charges 11 in reflection phases by inserting loss. Criteria to predict both number and angular positions of asymmetric BICs are established, providing new opportunities in thermal science, magneto-optics, or topological metasurfaces.

PHYSICAL REVIEW LETTERS (2021)

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Article Physics, Multidisciplinary

Bound states of the continuum in photonic structures

Kirill L. Koshelev et al.

PHYSICS-USPEKHI (2021)

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Article Chemistry, Multidisciplinary

From Fano to Quasi-BIC Resonances in Individual Dielectric Nanoantennas

Elizaveta Melik-Gaykazyan et al.

Summary: There is a close connection between Fano and quasi-BIC resonances in high-index dielectric nanostructures, which show great potential for applications in nanoscale lasers and sensors. Our experimental results demonstrate the relationship and suggest a unified approach for analyzing sharp resonances in subwavelength nanostructures.

NANO LETTERS (2021)

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Article Physics, Multidisciplinary

Chiral Quasi-Bound States in the Continuum

Adam Overvig et al.

Summary: The study introduces quasi-bound states in the continuum (QBICs) born of chiral perturbations, encoding arbitrary elliptical polarization states and enabling geometric phase engineering. Metasurfaces with ultrasharp spectral features are designed as a result, shaping impinging wave fronts with near-unity efficiency. The findings extend Fano resonances beyond their conventional limits, opening opportunities for nanophotonics, classical and quantum optics, and acoustics.

PHYSICAL REVIEW LETTERS (2021)

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Review Multidisciplinary Sciences

Multidimensional phase singularities in nanophotonics

Jincheng Ni et al.

Summary: The rapid progress in miniaturizing vortex devices is driven by their integration with optical sensing, micromanipulation, and optical communications. A new branch of singular optics has recently emerged seeking phase singularities in multiple dimensions to realize vortex beams with compact nanodevices. Research in this area focuses on topological phase singularities in real space, momentum space, and the spatiotemporal domain for generating vortex beams.

SCIENCE (2021)

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Review Physics, Multidisciplinary

Exceptional topology of non-Hermitian systems

Emil J. Bergholtz et al.

Summary: This review discusses the current understanding of the role of topology in non-Hermitian systems and its physical consequences in dissipative settings, focusing on the concept of exceptional degeneracies and its distinct phenomena, as well as the new notions of gapped phases in single-band systems. The unique sensitivity of non-Hermitian matrices to boundary conditions is highlighted, leading to anomalous relationships between bulk and boundary physics. Additionally, applications of non-Hermitian topology in classical and quantum systems are reviewed, showing its relevance beyond the field of topological phases.

REVIEWS OF MODERN PHYSICS (2021)

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Review Nanoscience & Nanotechnology

Topological polarization singularities in metaphotonics

Wenzhe Liu et al.

Summary: This paper reviews recent research on the generation and observation of polarization singularities in metaphotonics, including discussions on polarization singularities in Mie theory, various photonic-crystal structures, and conversions from polarization to phase singularities. The authors suggest that polarization singularities can provide novel perspectives for light-matter manipulation.

NANOPHOTONICS (2021)

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Article Physics, Applied

Observation of Giant Extrinsic Chirality Empowered by Quasi-Bound States in the Continuum

Jiaju Wu et al.

Summary: This study demonstrates giant extrinsic chirality in achiral metasurfaces by breaking the mirror symmetry of the system. The transmittance of two different polarization states and the signs of circular dichroism can be controlled by tilting the metasurface plane. Additionally, an application of polarization-multiplexed-field image display assisted by chiral quasi-BICs is shown.

PHYSICAL REVIEW APPLIED (2021)

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Article Multidisciplinary Sciences

Observation of bound states in the continuum embedded in symmetry bandgaps

Alexander Cerjan et al.

Summary: By microprinting a three-dimensional photonic crystal structure using two-photon polymerization, the limitation of symmetry-protected bound states in the continuum (BICs) to single-frequency applications can be overcome. This concept substantially expands the design freedom available for developing next-generation devices with high-Q states by protecting a line of BICs in a symmetry bandgap of the crystal.

SCIENCE ADVANCES (2021)

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Review Engineering, Electrical & Electronic

Wireless power transfer based on novel physical concepts

Mingzhao Song et al.

Summary: This article reviews the development of new physical effects and materials for wireless power transfer, including various new technologies such as coherent perfect absorption, parity-time symmetry and exceptional points, on-site power generation, metamaterials and metasurfaces, and acoustic power transfer.

NATURE ELECTRONICS (2021)

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Article Optics

Metasurfaces for quantum photonics

Alexander S. Solntsev et al.

Summary: Progress in the field of quantum-photonics applications of metasurfaces is rapidly advancing, enabling the development of optical chips and advanced quantum tomography. With the use of metamaterials and metaphotonics, bulky optical assemblies are being replaced with thin nanostructured films, leading to innovative approaches in controlling non-classical light properties.

NATURE PHOTONICS (2021)

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Article Optics

Rabi oscillations of bound states in the continuum

Stefano Longhi

Summary: In this study, a simple photonic structure is investigated, and it is shown that breaking mirror symmetry and allowing for non-nearest neighbor couplings can sustain a pair of quasi-BIC states, enabling weakly damped embedded Rabi oscillations of photons between the waveguides.

OPTICS LETTERS (2021)

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Article Physics, Multidisciplinary

Merging Bound States in the Continuum at Off-High Symmetry Points

Meng Kang et al.

PHYSICAL REVIEW LETTERS (2021)

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Article Physics, Multidisciplinary

Self-Isolated Raman Lasing with a Chiral Dielectric Metasurface

Jefferson Dixon et al.

Summary: By utilizing high-Q dielectric metasurfaces with intrinsic chirality, a single device that functions both as a light source and an optical isolator has been developed. Through careful manipulation of the geometry of constituent silicon metaatoms, three-dimensionally chiral modes were designed to act as optical spin-dependent filters. This design presents a new approach towards compactly isolating integrated light sources by directly tailoring the emission properties of the light source itself.

PHYSICAL REVIEW LETTERS (2021)

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Article Physics, Multidisciplinary

Theory for Twisted Bilayer Photonic Crystal Slabs

Beicheng Lou et al.

Summary: The scattering properties of twisted bilayer photonic crystal slabs were analyzed using a high-dimensional plane wave expansion method, showing strongly tunable resonance properties and chiral behavior. A semi-analytical explanation was provided for the resonant properties, along with a correspondence to a simpler structure.

PHYSICAL REVIEW LETTERS (2021)

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Article Physics, Applied

Magnetic Quasi-Bound State in the Continuum for Wireless Power Transfer

Yaozu Xie et al.

Summary: The study reveals that quasi-bound states in the continuum of metasurfaces can provide resonant enhancement of wireless power transfer, and this physical mechanism can also be applied in resonant coupling WPT systems. It is anticipated that the results of this study can be generalized and applied in other physical systems.

PHYSICAL REVIEW APPLIED (2021)

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Article Chemistry, Multidisciplinary

Giant Enhancement of Continuous Wave Second Harmonic Generation from Few-Layer GaSe Coupled to High-Q Quasi Bound States in the Continuum

Zhuojun Liu et al.

Summary: Two-dimensional layered materials like GaSe have shown promise as novel nonlinear optical materials, but their nonlinear responses are limited by short interaction lengths with light. By coupling 2D GaSe flakes to silicon metasurfaces, a significant enhancement of second-harmonic generation (SHG) has been achieved, opening up new possibilities for high-power coherent light sources.

NANO LETTERS (2021)

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Article Chemistry, Multidisciplinary

Hybrid anisotropic plasmonic metasurfaces with multiple resonances of focused light beams

Yao Liang et al.

Summary: This study demonstrates multiple resonances with high absorption amplitudes by utilizing the physics of bound states in the continuum, providing novel strategies for designing photonic devices that manipulate focused light.

NANO LETTERS (2021)

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Article Nanoscience & Nanotechnology

Magic-angle lasers in nanostructured moire superlattice

Xin-Rui Mao et al.

Summary: A new type of optical device called magic-angle laser has been proposed and developed in this study, utilizing twisted photonic graphene superlattices for localized feedback of light fields. Unlike conventional laser cavities, magic-angle lasers do not require discontinuity of material property or disorder, and can achieve strong field confinement and high quality factor nanocavities through a simple twist.

NATURE NANOTECHNOLOGY (2021)

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Article Optics

Ultra-coherent Fano laser based on a bound state in the continuum

Yi Yu et al.

Summary: Quantum noise is suppressed by a bound state in the continuum (BIC) approach, enabling a microlaser with narrow linewidth compared to other small lasers.

NATURE PHOTONICS (2021)

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Article Physics, Multidisciplinary

Extremize Optical Chiralities through Polarization Singularities

Weijin Chen et al.

Summary: Chiral optical effects are typically quantified along specific incident directions or as direction-independent properties by averaging responses among all structure orientations. However, the extremization of chirality with respect to incident directions or structure orientations has not been systematically explored. This study examines chiral responses of open photonic structures using quasinormal modes and polarization singularities, revealing the ideal maximization and minimization of optical chiralities for circular and linear polarizations, respectively, when plane waves are incident in certain directions.

PHYSICAL REVIEW LETTERS (2021)

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Article Physics, Multidisciplinary

Flat Bands in Magic-Angle Bilayer Photonic Crystals at Small Twists

Kaichen Dong et al.

Summary: This study utilized a coupled-mode theory to discover magic-angle photonic flat bands with a non-Anderson-type localization in low-angle twisted bilayer honeycomb photonic crystals. It also demonstrated that the interlayer separation can be used as a convenient degree of freedom to tune photonic moire bands without high pressure, providing a new avenue for the development of photonics.

PHYSICAL REVIEW LETTERS (2021)

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Article Physics, Multidisciplinary

Point Defect Localized Bound States in the Continuum in Photonic Crystals and Structured Fibers

Sachin Vaidya et al.

Summary: The study demonstrates that point defects in two-dimensional photonic crystals can support bound states in the continuum (BICs), serving as an alternative mechanism to confine light in the absence of band gaps. Additionally, these BICs can propagate in a fiber geometry with arbitrarily small group velocity, potentially enhancing nonlinear effects and light-matter interactions in structured fibers.

PHYSICAL REVIEW LETTERS (2021)

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Article Physics, Multidisciplinary

Polarization Singularities of Photonic Quasicrystals in Momentum Space

Zhiyuan Che et al.

Summary: This study reports the observation of polarization singularities in the momentum space of 2D photonic quasicrystal slabs, uncovering the relationship between the topological charges of these singularities and the symmetry of the photonic quasicrystal slabs. It confirms that these singularities are protected by the point-group symmetry of the photonic quasicrystal slab and correspond to quasi-bound states with high-quality factors in the continuum. Additionally, polarization singularities of different topological charges are experimentally verified, introducing core concepts of optical singularities into quasiperiodic systems.

PHYSICAL REVIEW LETTERS (2021)

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Article Multidisciplinary Sciences

Imaging-based spectrometer-less optofluidic biosensors based on dielectric metasurfaces for detecting extracellular vesicles

Yasaman Jahani et al.

Summary: The single-wavelength imaging biosensors introduced in this study achieve superior sensitivity for real-time detection of breast cancer extracellular vesicles, paving the way for miniaturized devices for point-of-care diagnostics. The method is based on reconstructing spectral shift information induced by biomarkers dynamically using diatomic dielectric metasurfaces supporting bound states in the continuum.

NATURE COMMUNICATIONS (2021)

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Article Materials Science, Multidisciplinary

Ultralow-Loss Etchless Lithium Niobate Integrated Photonics at Near-Visible Wavelengths

Yue Yu et al.

Summary: The article discusses the development of etchless lithium niobate integrated photonics to achieve minimal propagation loss and maximal intrinsic Q factor at near-visible wavelengths. The platform supports various visible-light applications.

ADVANCED OPTICAL MATERIALS (2021)

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Article Nanoscience & Nanotechnology

Ways to achieve efficient non-local vortex beam generation

Wenzhe Liu et al.

Summary: This study analyzes the efficiency factors of nonlocal vortex beam generation and proposes two approaches to improve efficiency. The mechanisms are theoretically analyzed and verified through full-wave simulations, showing a significant improvement in efficiency.

NANOPHOTONICS (2021)

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Article Nanoscience & Nanotechnology

Dispersive bands of bound states in the continuum

Stefano Longhi

Summary: BICs have brought a new paradigm in optics and photonics, leading to the formation of a tightly-bound dispersive energy miniband with a wide range of applications. The concept of a crystal made of BICs and its applications in optics were introduced in the study.

NANOPHOTONICS (2021)

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Article Materials Science, Multidisciplinary

Strong coupling between excitons in a two-dimensional atomic crystal and quasibound states in the continuum in a two-dimensional all-dielectric asymmetric metasurface

Peng Xie et al.

Summary: Researchers investigated the interaction between excitons and quasibound states in a two-dimensional atomic crystal and all-dielectric asymmetric metasurface. They found that both coherent and incoherent coupling processes coexist in the strong coupled system, leading to sub/superradiant polariton states. The topology of the two-dimensional all-dielectric metasurface modulates the fractions of magnetic and electric dipole ingredients, showing different features in high- and low-energy hybrid modes in the strong coupling system.

PHYSICAL REVIEW B (2021)

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Article Physics, Multidisciplinary

PT Symmetry Induced Rings of Lasing Threshold Modes Embedded with Discrete Bound States in the Continuum

Qianju Song et al.

Summary: This study reveals that introducing PT-symmetric perturbations into a photonic crystal (PhC) slab can lead to the creation of a new type of BICs, called pt-BICs, embedded in rings of lasing threshold modes. These pt-BICs exhibit reduced Q-factor divergence rates and anisotropy in momentum space, and can even appear at off-high symmetry lines of the Brillouin zone. The research also shows that pt-BICs carry topological charges and can be created or annihilated while conserving total charge, providing insights into the interplay between PT symmetry and BICs in PhC slabs.

CHINESE PHYSICS LETTERS (2021)

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Article Materials Science, Multidisciplinary

Quasibound states in the continuum induced by PT symmetry breaking

Denis V. Novitsky et al.

Summary: This study proposes a novel mechanism for the quasi-BIC manifestation driven by the PT symmetry breaking in optical structures. Singularities separating PT symmetric and broken-PT symmetry states in the parametric space are revealed, coinciding with BIC positions at the frequency of volume plasmon excitation. The quasi-BICs with ultrahigh quality factors and almost perfect transmission show promise in sensing, nonlinear optics, and other applications.

PHYSICAL REVIEW B (2021)

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Article Materials Science, Multidisciplinary

Photonic analog of bilayer graphene

Mourad Oudich et al.

Summary: This paper presents a photonic analog inspired by bilayer graphene, with two stacked graphenelike photonic crystals coupled through spoof surface plasmons. The photonic dispersion and band structure of the bilayer photonic graphene can be tailored through interlayer coupling and twist degree of freedom, leading to the prediction of magic angles and high-order photonic topological insulators. The proposed bilayer photonic graphene could potentially lead to the discovery of new quantum materials and next-generation photonic devices.

PHYSICAL REVIEW B (2021)

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Review Physics, Applied

Higher-order band topology

Biye Xie et al.

Summary: The emergence of higher-order topological insulators with gapless hinge or corner states has expanded our understanding of topological phases. These unconventional TIs have significant contributions to the development of photonic, phononic, and circuit systems, and their discovery has unveiled the hierarchical structure of topological band theory.

NATURE REVIEWS PHYSICS (2021)

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Article Quantum Science & Technology

Quantum Embedded Superstates

Nikita Nefedkin et al.

Summary: Optical supercavity modes play a crucial role in sensing applications, enabling compact systems with unprecedented sensitivity. Quantum sensors can overcome the shot-noise limit of classical quasi-BIC sensors, and three-level quantum systems can support the quantum analog of superstates with unboundedly narrow emission lines.

ADVANCED QUANTUM TECHNOLOGIES (2021)

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Article Physics, Multidisciplinary

Cavity optomechanics with photonic bound states in the continuum

Jamie M. Fitzgerald et al.

Summary: The study introduces a versatile free-space cavity optomechanics platform that enables efficient coupling between light and force, particularly for exploring new regimes of optomechanical interaction.

PHYSICAL REVIEW RESEARCH (2021)

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Review Materials Science, Multidisciplinary

Photonic Bound States in the Continuum: From Basics to Applications

Shaimaa Azzam et al.

Summary: The introduction of Bound States in the Continuum (BICs) has revolutionized cavity design and light-matter interactions in photonics, with high quality factors and applications in various fields. This review provides an overview of different types of BICs in photonic systems, their physics, and formation mechanisms, focusing on current and emerging applications shaping the interaction of light and matter.

ADVANCED OPTICAL MATERIALS (2021)

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Article Chemistry, Multidisciplinary

Observation of Supercavity Modes in Subwavelength Dielectric Resonators

Mikhail Odit et al.

Summary: This study investigates the experimental observation of supercavity modes in dielectric resonators with high refractive index, and discusses the achievement of supercavity modes through precise tuning of resonator dimensions. Experimental results demonstrate efficient excitation of supercavity modes in both near- and far-fields, exhibiting characteristic Fano resonance properties.

ADVANCED MATERIALS (2021)

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Article Physics, Multidisciplinary

Direct Visualizing the Spin Hall Effect of Light via Ultrahigh-Order Modes

Hailang Dai et al.

PHYSICAL REVIEW LETTERS (2020)

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Article Multidisciplinary Sciences

Ultrafast control of vortex microlasers

Can Huang et al.

SCIENCE (2020)

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Article Multidisciplinary Sciences

Subwavelength dielectric resonators for nonlinear nanophotonics

Kirill Koshelev et al.

SCIENCE (2020)

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Article Chemistry, Multidisciplinary

Lasing Action in Single Subwavelength Particles Supporting Supercavity Modes

Vasilii Mylnikov et al.

ACS NANO (2020)

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Article Chemistry, Physical

Normal-Incidence-Excited Strong Coupling between Excitons and Symmetry-Protected Quasi-Bound States in the Continuum in Silicon Nitride-WS2 Heterostructures at Room Temperature

Shun Cao et al.

JOURNAL OF PHYSICAL CHEMISTRY LETTERS (2020)

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Letter Optics

Nonlinear polaritons in a monolayer semiconductor coupled to optical bound states in the continuum

Vasily Kravtsov et al.

LIGHT-SCIENCE & APPLICATIONS (2020)

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Article Chemistry, Multidisciplinary

Bound States in the Continuum in Anisotropic Plasmonic Metasurfaces

Yao Liang et al.

NANO LETTERS (2020)

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Article Multidisciplinary Sciences

Observation of topologically enabled unidirectional guided resonances

Xuefan Yin et al.

NATURE (2020)

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Article Physics, Multidisciplinary

Singular Points of Polarizations in the Momentum Space of Photonic Crystal Slabs

Weimin Ye et al.

PHYSICAL REVIEW LETTERS (2020)

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Article Physics, Applied

On-Chip Diffraction-Free Beam Guiding beyond the Light Cone

Ye Lin et al.

PHYSICAL REVIEW APPLIED (2020)

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Article Optics

Doubly resonant second-harmonic generation of a vortex beam from a bound state in the continuum

Jun Wang et al.

OPTICA (2020)

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Review Nanoscience & Nanotechnology

Electronic-structure methods for twisted moire layers

Stephen Carr et al.

NATURE REVIEWS MATERIALS (2020)

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Review Nanoscience & Nanotechnology

Flat optics with dispersion-engineered metasurfaces

Wei Ting Chen et al.

NATURE REVIEWS MATERIALS (2020)

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Article Physics, Multidisciplinary

One-dimensional photonic bound states in the continuum

P. S. Pankin et al.

COMMUNICATIONS PHYSICS (2020)

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Article Chemistry, Multidisciplinary

Quasi-BIC Resonant Enhancement of Second-Harmonic Generation in WS2 Monolayers

Nils Bernhardt et al.

NANO LETTERS (2020)

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Article Optics

Generating optical vortex beams by momentum-space polarization vortices centred at bound states in the continuum

Bo Wang et al.

NATURE PHOTONICS (2020)

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Article Physics, Multidisciplinary

Generation and Annihilation of Topologically Protected Bound States in the Continuum and Circularly Polarized States by Symmetry Breaking

Taiki Yoda et al.

PHYSICAL REVIEW LETTERS (2020)

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Article Physics, Multidisciplinary

Multifunctional Nonlocal Metasurfaces

Adam C. Overvig et al.

PHYSICAL REVIEW LETTERS (2020)

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Article Optics

Dispersive optomechanics of supercavity modes in high-index disks

Laura Mercade et al.

OPTICS LETTERS (2020)

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Article Physics, Multidisciplinary

Metasurfaces with Maximum Chirality Empowered by Bound States in the Continuum

Maxim Gorkunov et al.

PHYSICAL REVIEW LETTERS (2020)

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Article Physics, Multidisciplinary

Unconventional Singularity in Anti-Parity-Time Symmetric Cavity Magnonics

Y. Yang et al.

PHYSICAL REVIEW LETTERS (2020)

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Article Multidisciplinary Sciences

Coexistence of a new type of bound state in the continuum and a lasing threshold mode induced by PT symmetry

Qianju Song et al.

SCIENCE ADVANCES (2020)

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Article Chemistry, Multidisciplinary

Continuous Wave Second Harmonic Generation Enabled by Quasi- Bound-States in the Continuum on Gallium Phosphide Metasurfaces

Aravind P. Anthur et al.

NANO LETTERS (2020)

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Article Chemistry, Multidisciplinary

Integrated Molar Chiral Sensing Based on High-Q Metasurface

Yang Chen et al.

NANO LETTERS (2020)

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Review Chemistry, Physical

Graphene bilayers with a twist

Eva Y. Andrei et al.

NATURE MATERIALS (2020)

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Article Physics, Multidisciplinary

Observation of a Higher-Order Topological Bound State in the Continuum

Alexander Cerjan et al.

PHYSICAL REVIEW LETTERS (2020)

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Article Materials Science, Multidisciplinary

Bound states in the continuum of higher-order topological insulators

Wladimir A. Benalcazar et al.

PHYSICAL REVIEW B (2020)

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Review Chemistry, Physical

Parity-time symmetry and exceptional points in photonics

S. K. Ozdemir et al.

NATURE MATERIALS (2019)

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Article Nanoscience & Nanotechnology

Transition metal dichalcogenide nanodisks as high-index dielectric Mie nanoresonators

Ruggero Verre et al.

NATURE NANOTECHNOLOGY (2019)

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Article Optics

Ultrasensitive hyperspectral imaging and biodetection enabled by dielectric metasurfaces

Filiz Yesilkoy et al.

NATURE PHOTONICS (2019)

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Article Physics, Multidisciplinary

Singularities and Poincare Indices of Electromagnetic Multipoles

Weijin Chen et al.

PHYSICAL REVIEW LETTERS (2019)

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Article Physics, Multidisciplinary

Optical Bound States in the Continuum with Nanowire Geometric Superlattices

Seokhyoung Kim et al.

PHYSICAL REVIEW LETTERS (2019)

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Article Materials Science, Multidisciplinary

Symmetry-Protected Dual Bound States in the Continuum in Metamaterials

Longqing Cong et al.

ADVANCED OPTICAL MATERIALS (2019)

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Article Multidisciplinary Sciences

Room temperature nanocavity laser with interlayer excitons in 2D heterostructures

Yuanda Liu et al.

SCIENCE ADVANCES (2019)

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Article Multidisciplinary Sciences

Angle-multiplexed all-dielectric metasurfaces for broadband molecular fingerprint retrieval

Aleksandrs Leitis et al.

SCIENCE ADVANCES (2019)

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Article Chemistry, Multidisciplinary

All-Dielectric Active Terahertz Photonics Driven by Bound States in the Continuum

Song Han et al.

ADVANCED MATERIALS (2019)

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Article Optics

Tuning the exponential sensitivity of a bound-state-in-continuum optical sensor

Silvia Romano et al.

OPTICS EXPRESS (2019)

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Article Physics, Multidisciplinary

Bound States in the Continuum through Environmental Design

Alexander Cerjan et al.

PHYSICAL REVIEW LETTERS (2019)

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Article Nanoscience & Nanotechnology

Nonlinear Metasurfaces Governed by Bound States in the Continuum

Kirill Koshelev et al.

ACS PHOTONICS (2019)

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Article Physics, Applied

Giant Enhancement of the Goos-Hanchen Shift Assisted by Quasibound States in the Continuum

Feng Wu et al.

PHYSICAL REVIEW APPLIED (2019)

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Article Optics

Spectral and temporal evidence o robust photonic bound states in the continuum on terahertz metasurfaces

Diego R. Abujetas et al.

OPTICA (2019)

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Article Physics, Multidisciplinary

Circularly Polarized States Spawning from Bound States in the Continuum

Wenzhe Liu et al.

PHYSICAL REVIEW LETTERS (2019)

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Article Optics

Doubly resonant χ(2) nonlinear photonic crystal cavity based on a bound state in the continuum

Momchil Minkov et al.

OPTICA (2019)

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Review Nanoscience & Nanotechnology

Near-zero-index materials for photonics

Nathaniel Kinsey et al.

NATURE REVIEWS MATERIALS (2019)

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Article Physics, Applied

Terahertz sensing of 7 nm dielectric film with bound states in the continuum metasurfaces

Yogesh Kumar Srivastava et al.

APPLIED PHYSICS LETTERS (2019)

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Article Multidisciplinary Sciences

Interlayer exciton laser of extended spatial coherence in atomically thin heterostructures

Eunice Y. Paik et al.

NATURE (2019)

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Article Multidisciplinary Sciences

Topologically enabled ultrahigh-Q guided resonances robust to out-of-plane scattering

Jicheng Jin et al.

NATURE (2019)

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Article Optics

Photosensitive chalcogenide metasurfaces supporting bound states in the continuum

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Photonic integrated circuits with bound states in the continuum

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Corner states in a second-order acoustic topological insulator as bound states in the continuum

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Radiative control of dark excitons at room temperature by nano-optical antenna-tip Purcell effect

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Low index contrast heterostructure photonic crystal cavities with high quality factors and vertical radiation coupling

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APPLIED PHYSICS LETTERS (2018)

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Trapping Light in Plain Sight: Embedded Photonic Eigenstates in Zero-Index Metamaterials

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Bound states in the continuum in a two-dimensional PT - symmetric system

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Giant Nonlinear Response at the Nanoscale Driven by Bound States in the Continuum

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Colloquium: Excitons in atomically thin transition metal dichalcogenides

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Imaging-based molecular barcoding with pixelated dielectric metasurfaces

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Label-free sensing of ultralow-weight molecules with all-dielectric metasurfaces supporting bound states in the continuum

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PHOTONICS RESEARCH (2018)

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Surface-Enhanced Raman and Fluorescence Spectroscopy with an All-Dielectric Metasurface

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Asymmetric Metasurfaces with High-Q Resonances Governed by Bound States in the Continuum

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PHYSICAL REVIEW LETTERS (2018)

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Formation of Bound States in the Continuum in Hybrid Plasmonic-Photonic Systems

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PHYSICAL REVIEW LETTERS (2018)

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Zero-Index Bound States in the Continuum

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Bound states in the continuum and high-Q resonances supported by a dielectric ridge on a slab waveguide

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PHOTONICS RESEARCH (2018)

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Strong coupling between excitons in transition metal dichalcogenides and optical bound states in the continuum

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Topological properties of bound states in the continuum in geometries with broken anisotropy symmetry

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Lasing action from photonic bound states in continuum

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Room-temperature continuous-wave lasing from monolayer molybdenum ditelluride integrated with a silicon nanobeam cavity

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Probing dark excitons in atomically thin semiconductors via near-field coupling to surface plasmon polaritons

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Magnetic brightening and control of dark excitons in monolayer WSe2

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Non-Hermitian photonics based on parity-time symmetry

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Anisotropy-induced photonic bound states in the continuum

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Topological Bound States in the Continuum in Arrays of Dielectric Spheres

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Metasurface Polarization Optics: Independent Phase Control of Arbitrary Orthogonal States of Polarization

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High-Q Supercavity Modes in Subwavelength Dielectric Resonators

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In-Plane Propagation of Light in Transition Metal Dichalcogenide Monolayers: Optical Selection Rules

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Frequency comb generation by symmetry-protected bound state in the continuum

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Particle Statistics Affects Quantum Decay and Fano Interference

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Observation and Differentiation of Unique High-Q Optical Resonances Near Zero Wave Vector in Macroscopic Photonic Crystal Slabs

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Experimental Observation of Optical Bound States in the Continuum

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Light Propagation with Phase Discontinuities: Generalized Laws of Reflection and Refraction

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Orbital angular momentum: origins, behavior and applications

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ADVANCES IN OPTICS AND PHOTONICS (2011)

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Fano resonances in nanoscale structures

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Optical analogue of coherent population trapping via a continuum in optical waveguide arrays

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Resonance-enhanced optical forces between coupled photonic crystal slabs

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OPTICS EXPRESS (2009)

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Adiabatic transfer of light via a continuum in optical waveguides

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OPTICS LETTERS (2009)

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Optical analog of population trapping in the continuum: Classical and quantum interference effects

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Bound states in the continuum in photonics

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Generation and photonic guidance of multi-octave optical-frequency combs

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Colloquium:: Light scattering by particle and hole arrays

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Manipulating electromagnetic wave polarizations by anisotropic metamaterials

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Effective medium theory for magnetodielectric composites: Beyond the long-wavelength limit

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Optical spin-to-orbital angular momentum conversion in inhomogeneous anisotropic media

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Displacement sensing using evanescent tunneling between guided resonances in photonic crystal slabs

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Optical microcavities

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Displacement-sensitive photonic crystal structures based on guided resonance in photonic crystal slabs

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Ultra-high-Q toroid microcavity on a chip

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Analysis of guided resonances in photonic crystal slabs

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Dispersion relation and optical transmittance of a hexagonal photonic crystal slab

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Photonic band structure of dielectric membranes periodically textured in two dimensions

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Two-dimensional vector-coupled-mode theory for textured planar waveguides

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