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Article
Optics
Hui Chen et al.
Summary: This study proposes a gate-tunable bolometer based on two strongly coupled graphene nanomechanical resonators. The properties of one bolometer can be measured directly by tracking the resonance frequency shifts, while the other bolometer can be indirectly measured through mechanical coupling. The sensitivity and response bandwidth of both bolometers can be independently adjusted by tuning the corresponding gate voltages. The method has the potential to optimize the design of large-scale bolometer arrays and open new horizons in infrared/terahertz astronomy and other fields.
Article
Optics
Steffen Schoenhardt et al.
Summary: Integrated photonic resonators based on bound states in the continuum (BICs) on the silicon-on-insulator (SOI) platform have the potential for novel, mass-manufacturable resonant devices. To overcome the size limitation of traditional resonator structures, this study investigates the translation of BIC-based ridge resonators into a guided mode system with finite lateral dimensions. Numerical simulations demonstrate that, similar to BIC-based resonators, such a waveguide system can exhibit spectrally narrow-band inversion of its transmissive behavior.
Article
Chemistry, Multidisciplinary
Jin Tao et al.
Summary: An ultracompact full-duplex metabroadcasting communication system is designed and demonstrated, showcasing high performance and small size. By combining optical wireless-broadcasting communication and metasurfaces, it opens up a new avenue for enhancing the quality of optical wireless broadcasting communications.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Changhua Bao et al.
Summary: This study reveals the ultrafast dynamics of Dirac fermions in a 3D Dirac semimetal, showing their cooling mechanism and population inversion phenomenon. The linear dependence of relaxation rate on energy suggests cooling through intraband relaxation, and the observation of accumulated photoexcited carriers in the conduction band indicates population inversion with a relatively long lifetime compared to 2D graphene.
Article
Optics
Bo Meng et al.
Summary: Dissipative Kerr solitons are self-organized optical waves that arise from the interaction between the Kerr effect and dispersion, forming in nonlinear microresonators by tuning the parameters of the external pump laser. The experimental observation of dissipative Kerr solitons in a ring cavity with a fast semiconductor gain medium extends the spectral range of soliton microcombs to mid-infrared wavelengths, showing potential for integrated, battery-driven spectrometers in the molecular fingerprint region.
Article
Optics
Jin Leng et al.
Summary: The study found that changes in asymmetry significantly impact the Q factor and depth of amplitude modulation of Fano resonance, the carrier concentration of silicon plays a significant role in the intensity of excited Fano resonance, and a uniform graphene layer can effectively modulate Fano resonance.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Optics
Peng Suo et al.
Summary: We report on the ultrafast photocarrier dynamics and coherent phonon excitation in platinum ditelluride (PtTe2) thin films, which are type-II Dirac semimetals. Using femtosecond pump-probe spectroscopy at room temperature, we quantitatively analyze the incoherent electronic relaxation and observe the generation of coherent acoustic phonon (CAP) and coherent optical phonon (COP). Our findings provide deep insight into the excitation and dynamics of CAP and COP, as well as the photocarriers' recovery pathway and lifetimes in PtTe2.
PHOTONICS RESEARCH
(2022)
Article
Optics
A. Fisher et al.
Summary: The terahertz gap is a region in the electromagnetic spectrum where high power radiation sources are scarce but the demand for scientific and industrial applications is increasing. This study demonstrates the use of a circular waveguide and a strongly tapered helical undulator to efficiently extract resonant energy from a short electron beam, resulting in an average energy efficiency of about 10%.
Article
Optics
Haihang Ruan et al.
Summary: This paper proposes an efficient terahertz image super-resolution model using sub-pixel convolution and attention mechanism to improve the quality and resolution of terahertz images. Experiments show that the model achieves better accuracy and visual improvement compared to other algorithms.
Article
Nanoscience & Nanotechnology
Marianne Aellen et al.
Summary: This article discusses the extraction of optical gain in photonic amplifiers and lasers, focusing on the confinement factor. A more general and accurate description of the confinement factor is proposed and its validity and limitations are examined through numerical examples. The findings highlight the importance of using the general formula for accurate characterization, particularly in the design of nanophotonic and plasmonic devices.
Review
Nanoscience & Nanotechnology
Zhihui Mao et al.
Summary: In this article, we provide an overview of the recent research progress on two-dimensional materials in the field of surface plasmon resonance biosensors, focusing on the application and mechanisms of graphene and molybdenum sulfide in sensor interface construction and sensitivity enhancement.
Article
Chemistry, Multidisciplinary
Weixin Liu et al.
Summary: We propose an all-dielectric metamaterial-assisted comb (ADMAC) waveguide to greatly enhance the sensing capability. Our sensor operates in the underdeveloped long-wave infrared spectral region, where absorption fingerprints of plentiful chemical bonds are located.
Article
Nanoscience & Nanotechnology
Nicole R. Blumenfeld et al.
Summary: This study proposes a strategy using plasmonic polymerase chain reaction for multiplexed fluorescence detection of SARS-CoV-2 RNA in human samples, showing potential as a point-of-care approach. The use of small optical components enables rapid and accurate molecular clinical diagnostics in decentralized settings.
NATURE NANOTECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Jiaojian Shi et al.
Summary: Researchers have developed a room-temperature terahertz camera and polarimeter based on a quantum-dot-enhanced THz-to-visible upconversion mechanism. The camera offers broadband and fast responses and can detect THz pulses with peak fields as low as 10 kV cm(-1).
NATURE NANOTECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Xiaoyong He et al.
Summary: Based on 3D Dirac semimetals, the tunable propagation properties of quasi-bound in continuum resonance have been investigated. The results show that by altering the rotation angle of elliptical resonator, a sharp BIC transmission dip is observed. The DSM Fermi level and the configuration of resonators also affect the BIC resonance, with the Fermi level significantly influencing the resonance and modifying the configuration causing additional transmission dips.
Article
Materials Science, Multidisciplinary
Wenjie Zhang et al.
Summary: The photocarrier dynamics in Cd3As2 film was investigated using time-resolved terahertz spectroscopy. The results showed that photoexcitation led to a sudden increase in THz photoconductivity, followed by a single exponential relaxation. The relaxation time increased with temperature, while the lifetime remained almost constant above 220 K. The fitting of a model revealed a narrow energy gap around the Dirac node.
Article
Materials Science, Multidisciplinary
Jiayu Li et al.
Summary: This study demonstrates a graphene-nanowire coupled plasmonic metasurface that utilizes the hybrid localized surface plasmon modes of the nanowire array and graphene. The spectral emissivity can be actively tuned by graphene, and the polarization dependence of nanowire emission can be eliminated.
Article
Multidisciplinary Sciences
Wenhan Cao et al.
Summary: Atomic force microscopy (AFM) offers high resolution imaging but is constrained to small areas. This study introduces a massively parallel AFM approach with over 1000 probes in a cantilever-free probe architecture, along with an optical method that enables sub-10nm vertical precision in detecting probe-sample contact.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Peng Suo et al.
Summary: In this study, the photocarrier dynamics of PtTe2 thin films were systematically studied using optical pump-terahertz probe spectroscopy. The research revealed unusual behaviors of terahertz photoconductivity and provided insights into simultaneous carrier cooling and polaron formation on a subpicosecond timescale. These findings are crucial for the design of optoelectronic devices based on PtTe2.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Physical
Canhui Wang et al.
Summary: This study demonstrates that endothermic reactions requiring higher activation energy can be initiated at room temperature using deep-UV localized surface plasmons. By exciting multiple localized surface plasmon modes, the reduction of CO2 to CO by carbon was successfully achieved at room temperature.
Article
Materials Science, Multidisciplinary
Hamid T. Chorsi et al.
ADVANCED OPTICAL MATERIALS
(2020)
Article
Chemistry, Multidisciplinary
Yanju Ji et al.
APPLIED SCIENCES-BASEL
(2020)
Article
Multidisciplinary Sciences
Yang Wang et al.
Article
Nanoscience & Nanotechnology
Jun Peng et al.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2020)
Article
Optics
Kelvin J. A. Ooi et al.
Article
Optics
Gui-Dong Liu et al.
Article
Materials Science, Multidisciplinary
O. V. Kotov et al.
Article
Chemistry, Physical
Xiaoyong He
Article
Physics, Applied
Thamani M. Wijesinghe et al.
JOURNAL OF APPLIED PHYSICS
(2015)
Article
Optics
Giulio Biagi et al.
Article
Chemistry, Physical
Tian Liang et al.
Article
Chemistry, Multidisciplinary
Cameron L. C. Smith et al.
Article
Chemistry, Physical
Z. K. Liu et al.
Article
Optics
Christine Donnelly et al.
Article
Nanoscience & Nanotechnology
Jacek Gosciniak et al.
Article
Physics, Applied
Hong-Son Chu et al.
APPLIED PHYSICS LETTERS
(2010)
Article
Optics
R. F. Oulton et al.
Article
Multidisciplinary Sciences
KL Wang et al.