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Article
Optics
Chao Zhao et al.
Summary: In this paper, a gas concentration sensor with parity-time symmetry is proposed for high sensitivity at low concentrations. The sensor can detect toxic gases such as benzene, bromine, and acetone by probing the faint changing of the permittivity. The sensitivity level can be adjusted by the resistance segment, providing a novel idea for the development of future gas concentration sensors.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
(2022)
Article
Optics
Alessandro Tuniz et al.
Summary: We evaluate the sensing properties of plasmonic waveguide sensors by calculating their resonant transmission spectra in different regions of the non-Hermitian eigenmode space. Our findings highlight the limitations of using modal dispersion calculations alone to predict sensor performance. We show that the resonant wavelength and spectral width crucially depend on the length of the sensing region, and the narrowest spectra occur where directional coupling is supported.
PHOTONICS RESEARCH
(2022)
Article
Optics
Chuanxun Du et al.
Summary: In this study, two non-Hermitian arrays were proposed to investigate light transfer dynamics based on Nth-order exceptional points (EPs). One array exhibits parity-time (PT) symmetry, while the other exhibits anti-PT symmetry. The light transfer dynamics in these arrays exhibit different behaviors, including oscillation and localization, depending on the symmetry of the matrices.
Article
Optics
Jianing Zhang et al.
Summary: In this study, parity time symmetry breaking was achieved in a specially designed fiber ring laser with a homemade tunable isolator. The dynamic evolution of the cavity eigenmodes around the exceptional point was experimentally investigated. The results demonstrated that operating the laser near the exceptional point enabled single longitudinal mode lasing without the need for narrow-band filters.
Article
Optics
Arpan Roy et al.
Summary: The engineering of exceptional points (EPs) in open optical systems has attracted significant attention for future all-optical devices. However, there is a lack of investigation on the fascinating features of EPs in fiber geometries. In this study, a feasible dual-core optical fiber segment is designed to host a dynamical EP encirclement scheme. An asymmetric conversion process between supported modes is achieved by exploiting the chirality of the encountered EP. This scheme provides an advanced platform for designing mode-manipulative all-optical components in communication and all-fiber photonic devices.
Article
Optics
D. Kaltsas et al.
Summary: This paper presents a systematic method to construct infinite optical waveguide lattices that exhibit higher order exceptional points. The spectral properties and sensitivity of these lattices around such points are investigated using the pseudospectra method.
Article
Optics
Alice De Corte et al.
Summary: This study introduces tailored dipole sources for directional excitation in a PT-symmetric structure, achieving qualitatively different wave propagation on the two sides of the dipole, including mode beatings and one-sided gain. These findings offer new possibilities for integrated photonics applications, routing setups, and lasing behavior.
Article
Optics
Wei-Chao Gao et al.
Summary: The concept of parity-time (PT) symmetry, originating from quantum mechanics, has been introduced into various systems in recent years for studying the dynamic behaviors of Hamiltonian and energies. This experimental study on a two-level quantum system under PT symmetric Hamiltonian using single-photon system provides a new approach for further exploiting the exotic properties of PT symmetric Hamiltonian for quantum simulation and quantum information processing, by enlarging the system with ancillary qubit and utilizing the dilation method effectively.
Article
Optics
Chuan-Xun Du et al.
Summary: The study investigates the topological features in a trimerized lattice with parity-time symmetry, finding that the variation in topological regions is influenced by the nearest-neighbor and next-nearest-neighbor couplings as well as the Peierls phase. By adjusting the next-nearest-neighbor coupling, it is possible to locally enhance or weaken localization in specific regions, leading to a two-step phase transition of "zero-two-four" edge states.
Article
Optics
Yulin Wu et al.
Summary: This paper investigates the response order of high-order non-Hermitian systems, provides guidelines for designing a sensor with high response order, and demonstrates an optical sensor with a fourth-order response. The sensor shows a large sensitivity enhancement factor over 100 compared to traditional single resonator-based sensors under small perturbation conditions.
Article
Optics
C. N. Alexeyev et al.
Summary: The study found that strong coupling does not alter the structure of supermodes but affects only their propagation constants. The research also highlighted the evolution of OVs, differences in power distribution, and the negligible influence of interference effects in forming the total OAM under strong coupling. It was demonstrated that in such systems, it is sufficient to consider only the coupling of OVs with equal topological charges.
Article
Optics
Matthew J. Grant et al.
Summary: The study reveals that a passive coupled-ring optical gyroscope operated at its exceptional point does not provide higher sensitivity or lower minimum detectable rotation rate in the quantum-noise limit compared to a standard single-ring gyroscope. Operating at the exceptional point does not offer any sensitivity or resolution benefit in this particular passive sensor.
Article
Optics
C. N. Alexeyev et al.
Summary: This paper investigates the transmission of optical vortices through ring resonators based on multimode fibres. By analyzing the parameters of the ring resonators, the study shows the ability to control the topological charges and orbital angular momentum of the outgoing field, as well as the wavelength-scale sensitivity to variations in the ring's length. Additionally, the research examines the impact of losses on OV transmission and how controlling the attenuation parameter can influence the topological charge of the output field.
Article
Optics
C. N. Alexeyev et al.
Summary: This Letter discusses the impact of losses and gains on the generation of optical vortices in a chiral fiber, showing that losses can play a constructive role. The study of field evolution at the exceptional point reveals the formation of a special attractor mode with average OAM at the generalized Poincare sphere. This attractor mode is represented by the OAM black hole, analogous to the spin black hole introduced in a previous study.
Article
Optics
Chang-Long Zhu et al.
Summary: This study presents a mechanism for achieving synchronization of mechanical modes in two coupled optomechanical resonators with a parity-time (PT)-symmetric structure. It is shown that decreasing the coupling strength between the resonators can increase the degree of synchronization between mechanical modes. Additionally, the presence of stochastic noises near the exceptional point can enhance the synchronization of the system within a specific parameter regime.
PHOTONICS RESEARCH
(2021)
Article
Optics
Anubhav Paul et al.
Summary: The study investigates the emergence of higher-order EPs in a planar coupled-waveguide geometry and designs a waveguide array to support multiple quasiguided hybrid modes. By introducing customized gain-loss profiles, the research reveals both the chiral and nonchiral dynamics of light assisted by asymmetric mode conversions.
Article
Optics
Wei Xiong et al.
Summary: The study proposes a benchmark cavity optomechanical system for predicting third-order exceptional points and discusses the characteristics of different cavity systems in symmetric and asymmetric cases. Their proposal provides a potential way to realize sensitive detection and study other physical phenomena around higher-order exceptional points in non-Hermitian COM systems.
Article
Optics
Hai Xu et al.
Summary: Theoretical study on the dynamics of an optomechanical system in both PT- and broken-PT-symmetric regimes reveals the phase diagram and various regimes of PT symmetry and stability. By adjusting mechanical gain or optomechanical coupling appropriately, the phase transitions of PT symmetry and system stability can be controlled flexibly, leading to radical changes in the dynamical behaviors of average displacement, photons, and phonons in different regimes. This physical mechanism is general and can be extended to other dissipative and amplified coupled systems, showing the potential of PT-symmetric optomechanical devices for manipulation of mechanical motion, photons, and phonons.
Article
Optics
Wenxiu Li et al.
Summary: This study introduces a new optical gyroscope configuration based on a single resonator to establish an exceptional surface and enhance frequency splitting. By tuning the system, high sensitivity rotation detection is achieved, with experimental results showing a frequency change four orders of magnitude higher than that of traditional gyroscopes.
Article
Optics
Menglin L. N. Chen et al.
Summary: The effects of gain and loss on the band structures of a bulk topological dielectric photonic crystal and the PC-air-PC interface were studied, with a focus on the importance of parity-time (PT) symmetry. It was found that a PT-symmetric system exhibited a phase transition as the strength of gain and loss increased, while PT-asymmetric and lossy systems did not. The topology of the PT-symmetric system in the PT exact phase remained unchanged according to Wilson loop calculation, and different edge states in Hermitian systems under influence of gain and loss were also studied.
Article
Optics
Dmitry A. Zezyulin et al.
Summary: A two-dimensional nonlinear waveguide with distributed gain and losses is studied, where the system consists of an unperturbed complex potential and a small nonseparable perturbation. The system features an exceptional point in its spectrum, driving it into the unbroken phase and resulting in stable propagation of two-component envelope solitons. In the original model, taking both traverse directions into account leads to metastable two-component bright solitons that persist over long propagation distances.
Article
Optics
Nimrod Moiseyev et al.
Summary: The study explores the propagation of light in waveguides near an exceptional point while slightly breaking PT symmetry. It is found that breaking the PT symmetry does not affect the output signal structure, although the propagation constants become slightly complex. Only with a strong breaking of PT symmetry can the signal be significantly enhanced or suppressed.
Article
Optics
S. Vignesh Raja et al.
Summary: This paper presents a comb spectrum generating device based on Bragg grating superstructures with gain and loss, providing different optimization methods for various applications and requirements, including physical length, gain-loss parameters, etc.
Article
Optics
Victor V. Kotlyar et al.
Review
Optics
Jan Wiersig
PHOTONICS RESEARCH
(2020)
Article
Optics
Bo Zhu et al.
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Engineering, Electrical & Electronic
Zhiqiang Fan et al.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2020)
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Optics
C. N. Alexeyev et al.
Article
Multidisciplinary Sciences
Alfredo Rueda et al.
Review
Chemistry, Physical
S. K. Ozdemir et al.
Article
Optics
C. N. Alexeyev et al.
Review
Multidisciplinary Sciences
Han Zhao et al.
NATIONAL SCIENCE REVIEW
(2018)
Article
Optics
Zhishen Zhang et al.
Article
Optics
M. Sumetsky
Article
Multidisciplinary Sciences
A. Turpin et al.
SCIENTIFIC REPORTS
(2017)
Article
Optics
Sunkyu Yu et al.
Article
Physics, Multidisciplinary
Giovanni Milione et al.
PHYSICAL REVIEW LETTERS
(2011)
Article
Optics
C. N. Alexeyev et al.
Article
Physics, Multidisciplinary
Christian E. Rueter et al.
Article
Optics
C. N. Alexeyev et al.
Article
Optics
C. N. Alexeyev et al.
JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS
(2009)
Article
Physics, Multidisciplinary
A. Guo et al.
PHYSICAL REVIEW LETTERS
(2009)
Article
Multidisciplinary Sciences
P. Del'Haye et al.
Article
Optics
C. N. Alexeyev et al.
JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS
(2007)
Article
Physics, Multidisciplinary
MV Berry
CZECHOSLOVAK JOURNAL OF PHYSICS
(2004)
Article
Multidisciplinary Sciences
DJ Jones et al.
Article
Physics, Fluids & Plasmas
WD Heiss
