Article
Multidisciplinary Sciences
Yevgeny Slobodkin, Gil Weinberg, Helmut Hoerner, Kevin Pichler, Stefan Rotter, Ori Katz
Summary: One of the key insights of non-Hermitian photonics is the concept of coherent perfect absorber (CPA), which can be achieved by reversing the operation of well-established concepts like lasers. This study demonstrates the possibility of overcoming the limitation of CPA by time-reversing a degenerate cavity laser based on a unique cavity that self-images any incident light field onto itself. The results show that placing a weak, critically coupled absorber into this cavity allows for nearly perfect absorption of any incoming wavefront, even complex and dynamically varying speckle patterns. This opens up new possibilities for applications in light harvesting, energy delivery, light control, and imaging.
Article
Nanoscience & Nanotechnology
Philipp Grimm, Gary Razinskas, Jer-Shing Huang, Bert Hecht
Summary: The study demonstrates that a generalized version of coherent perfect absorption (gCPA) can be applied to nanoresonators with radiative losses, offering the possibility of achieving perfect impedance matching between different components in plasmonic systems.
Article
Materials Science, Multidisciplinary
Ting Hu, Qi Wei, Xing-Feng Zhu, Jie Yao, Da-Jian Wu
Summary: The proposed acoustic anti-parity-time (A-PT) symmetric structure demonstrates extraordinary scattering properties, achieving acoustic coherent perfect absorption and equivalent laser effects in the symmetric phase of the scattering matrix. This structure may facilitate further experimental realizations and offer an alternative approach to design acoustic functional devices.
Review
Nanoscience & Nanotechnology
Yu Yao, Jin Zhou, Zhengqi Liu, Xiaoshan Liu, Guolan Fu, Guiqiang Liu
Summary: Metamaterial light absorbers have gained significant attention for their absorption efficiency and wide range of applications, but traditional noble metals based absorbers can suffer from structural damage due to local high temperatures. Intensive research has focused on developing absorbers that can maintain efficient light absorption and structural stability at high temperatures. Refractory materials are seen as key to providing robust thermal stability and high performance for light absorption.
Article
Optics
Miao-Di Guo, Hai-Feng LI, Feng-Lei Wang, Chun-Xiao Zhou, Ya-Jie Wu
Summary: In this research, a scheme is proposed to operate a bistable switch with convertible CPA and/or CPR, allowing for extreme manipulation of an optical field. The switch can be operated in both the linear and nonlinear or bistable regime, and its efficiency is highly dependent on the input-field intensity. This work has potential applications in sensitive optical detecting.
Article
Chemistry, Multidisciplinary
Jihoon Choi, Heeso Noh
Summary: In this study, single-port coherent perfect loss (CPL) was numerically demonstrated in a photonic crystal nanobeam using a Fabry-Perot resonator and a perfect magnetic conductor-like boundary. By designing and optimizing a simple Fabry-Perot resonator and coupler in the nanobeam, the researchers were able to achieve CPL with zero reflection in a single port. Adjustment of the lattice constant of the photonic crystal allowed for control of coupling loss in the resonator, ultimately leading to the successful realization of the CPL mode.
Article
Multidisciplinary Sciences
Stylianos D. Assimonis, Gabriel G. Machado, Vincent Fusco
Summary: This study introduces a novel coherent absorber printed using conventional inkjet-printing technology, featuring low cost, frequency independence, polarization insensitivity, wide-angle absorption, and the ability for recongifurable absorbance. Experimental results show near perfect absorption can be achieved with a printed sheet of thickness lambda/215.
SCIENTIFIC REPORTS
(2022)
Article
Acoustics
Golakoti Pavan, Sneha Singh
Summary: This paper presents a new Porous Labyrinthine Acoustic Metamaterial (PLAM) that achieves near-perfect sound absorption at low frequencies through a folded slit labyrinthine structure in a micro-porous matrix. The research provides a new approach for designing labyrinthine metamaterials with broader sound absorption range for aerodynamic noise control applications.
Article
Optics
Philipp del Hougne, K. Brahima Yeo, Philippe Besnier, Matthieu Davy
Summary: Recent attention has been drawn to non-Hermitian photonic systems that can perfectly absorb incident radiation due to their exotic scattering phenomenon and technological promise. The reflection dip in these systems is a key feature for applications in sensing, communication, and filtering. A theoretical description has been developed to explain the shape of the reflection dip, showing a link between coherent perfect absorption and system sensitivity to perturbations. Experimental confirmation has been achieved in a 3D chaotic cavity, demonstrating on-demand CPA without relying on fixed operation frequencies. The optimal sensitivity of CPA conditions to system perturbations has been theoretically proven and experimentally verified.
LASER & PHOTONICS REVIEWS
(2021)
Article
Nanoscience & Nanotechnology
Dongyang Yan, Ran Mei, Mingyan Li, Zhikai Ma, Zhi Hong Hang, Jie Luo
Summary: In coherent perfect absorption (CPA), the connectivity of defects plays a critical role in achieving and controlling CPA. The establishment of long-range connectivity is crucial for realizing CPA and it exhibits remarkable resilience against defects' deformation and changes in the media. Minor disruptions to this connectivity result in a complete reduction of absorption.
Article
Engineering, Multidisciplinary
Liyun Cao, Yifan Zhu, Sheng Wan, Yi Zeng, Badreddine Assouar
Summary: This study presents a non-Hermitian loss-modulation beam and plate model based on complex wavenumber plane for designing lossy elastic metamaterials. The high-performance absorption of the metamaterial is achieved through a combination of dissipation-radiation balance and multiple reflections. The study provides a new approach for broadband low-frequency vibration suppression and offers an effective paradigm for wave engineering in non-Hermitian elastic wave systems.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2022)
Article
Physics, Applied
Ting Zhou, Shuai Wang, Yanzi Meng, Shiyu Wang, Yanghong Ou, Hongjian Li, Huangqing Liu, Xiang Zhai, Shengxuan Xia, Lingling Wang
Summary: The composite metasurface made of InSb strips and SiO2 substrate achieves multi-band coherent perfect absorption in the terahertz frequency range. By controlling the relative phase or intensity, absorption at each resonance frequency can be independently modulated. The design also exhibits thermal tunability and sensitivity to refractive index, making it suitable for sensing applications in the terahertz band.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Fangfang Ju, Chen Liu, Ying Cheng, Shengyou Qian, Xiaojun Liu
Summary: This study extends parity-time symmetric systems to acoustics by using coupled Mie resonators, achieving PT symmetry with only passive materials. Coherent perfect absorption is observed in the PT symmetric phase, showcasing potential applications in tunable noise control and acoustic modulators.
Article
Optics
Jipeng Wu, Jie Tang, Rongzhou Zeng, Xiaoyu Dai, Yuanjiang Xiang
Summary: Through investigating the phenomenon of coherent perfect absorption (CPA) with bulk Dirac semimetal (BDS) thin film, it is found that CPA can be achieved under different polarizations and incidence circumstances, and its frequency and dynamic regulation can be adjusted by changing the thickness of the thin film and Fermi energy.
CHINESE OPTICS LETTERS
(2021)
Article
Physics, Applied
Zhongming Gu, Tuo Liu, He Gao, Shanjun Liang, Shuowei An, Jie Zhu
Summary: A simple scheme to achieve acoustic CPA and laser modes by embedding a non-Hermitian dopant in a zero index metamaterial is proposed in this work. The effectiveness of these modes is ensured through theoretical derivation and numerical simulation, and their sensitivity can be controlled by adjusting structure parameters or the relative phase.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Optics
Mengke Sun, Tianshuo Lv, Ziying Liu, Fatian Wang, Wenjia Li, Yang Zhang, Zheng Zhu, Chunying Guan, Jinhui Shi
Summary: This study proposes a novel VO2-enabled transmission-reflection switchable coding terahertz metamaterial, which can switch between refractive and reflective scattering beams by temperature control. It also successfully constructs an OAM generator based on the coding metasurface.
Article
Optics
Yuan Jin, Jing Yang, Chunying Guan, Hongzhou Chen, Jinhui Shi, Ping Li, Jun Yang, Libo Yuan
Summary: A refractive index sensor based on a tapered hole-assisted dual-core fiber is proposed, which operates on the coupling between the fundamental mode and the low-order mode in two cores. The sensor shows high sensitivity, simple structure, and stable performance, and can simultaneously measure the refractive index of different solutions.
Article
Optics
Shun Wan, Keda Wang, Fatian Wang, Chunying Guan, Wenjia Li, Jianlong Liu, Andrey Bogdanov, Pavel A. Belov, Jinhui Shi
Summary: Ultrahigh-Q chiroptical resonance metasurfaces based on merging bound states in the continuum are investigated and numerically demonstrated. The destruction of C-2 symmetry leads to leakage of bound states into quasi-bound states, and a chiral quasi-bound state is obtained by oblique incidence or continuous destruction of the mirror symmetry. The resulting chiral resonance peak has a significantly higher Q factor (over 2x10^5) compared to previous work. The proposed structure is also advantageous in terms of fabrication simplicity, as no additional out-of-plane asymmetry is required. This research holds importance for chiral biosensing applications.
Article
Physics, Applied
Wenxia Xu, Wenjia Li, Zhaoqi Jiang, Botian Sun, Chunhua Qin, Bo Lv, Chunying Guan, Jianlong Liu, Jinhui Shi
Summary: In this study, a versatile on-chip silicon-patterned silicon-nitride photonic integrated waveguide is proposed to produce a direction-dependent polarization modulator for Cherenkov diffraction radiation. The radiation angle can be manipulated arbitrarily by arranging the period of the grating and the propagation direction of the electron beam. Furthermore, the polarization and the number of output directions of the radiation can be controlled by the gradient metasurfaces.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Optics
Yicheng Li, Zhengwei Deng, Chunhua Qin, Shicheng Wan, Bo Lv, Chunying Guan, Jun Yang, Shuang Zhang, Jinhui Shi
Summary: This study proposes a bilayer metasurface with orthogonally oriented split-ring resonators (SRRs), in which a phase transition of eigenpolarization states is introduced by changing the conductivity of vanadium dioxide (VO2) patch. The metasurface exhibits a passive parity-time (PT) symmetry, and an exceptional point (EP) in polarization space is observed at a certain conductivity of the VO2. Two sensing schemes using the metasurface are proposed for high-sensitivity sensing of temperature and refractive index in the terahertz (THz) range. The metasurface shows great potential for THz biosensing and polarization manipulation applications.
Article
Physics, Applied
Hongzhou Chen, Zhenyu Duan, Chunying Guan, Shan Gao, Peng Ye, Yan Liu, Jing Yang, Hongchao Liu, Jinhui Shi, Jun Yang, Libo Yuan
Summary: In this study, a compact all-fiber speckle spectrometer was constructed using cascading coreless fibers and photonic crystal fibers, achieving high resolution performance. The proposed fiber structure generates more guided modes and forms speckle patterns through modal interferences. With a 10 cm-long fiber, a resolution of 0.03 nm over a bandwidth from 1540 to 1560 nm was achieved. The performance of this spectrometer surpasses that of a 2 m multimode fiber spectrometer and is approximately 20 times higher than that of the same length multimode fiber.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Jing Liu, Chunying Guan, Hongzhou Chen, Bo Liu, Tailei Cheng, Jing Yang, Jinhui Shi, Libo Yuan
Summary: A transverse multi-position optical fiber tweezer is developed by integrating an all-dielectric metasurface on the end of the dual-core optical fiber, enabling trapping of nanoscale nanoparticles in far field. The tweezer utilizes the deflection of the emitted beams from the fiber cores to form interference fringes. The dielectric metasurface-based fiber tweezer shows higher efficiency and stronger capturing force compared to metal-based metasurfaces.
OPTICS COMMUNICATIONS
(2023)
Article
Optics
Kaihao Zheng, Wenjia Li, Botian Sun, Yehan Wang, Chunying Guan, Jianlong Liu, Jinhui Shi
Summary: In this study, we investigate the annular transverse scattering and unidirectional transverse scattering by magnetoelectric coupling of the Ω particle. The annular transverse scattering is achieved by the longitudinal dipole mode of the Ω particle. Furthermore, we demonstrate highly asymmetric unidirectional transverse scattering by adjusting the transverse electric dipole and longitudinal magnetic dipole modes, while suppressing forward and backward scattering through interference. The lateral force exerted on the particle is accompanied by transverse scattering, providing a useful toolset for manipulating scattered light and expanding the application range of magnetoelectric particles.
Article
Nanoscience & Nanotechnology
Chunhua Qin, Yiyuan Wang, Ziying Liu, Wenjia Li, Yuxiang Li, Ping Li, Zheng Zhu, Chunying Guan, Jinhui Shi, Kenneth T. V. Grattan
Summary: In this study, a miniaturized high-efficiency polarizer based on an Au-on-silica grating structure has been proposed, which can cover the entire visible and near-infrared spectral ranges with an extinction ratio (ER) of 60 dB in this range. By regulating the thickness of the grating, an ER of up to 150 dB can be achieved. By integrating this high-performance polarizer with an optical fiber meta-tip, a refractive polarizer with an ER value of >45 dB over the entire spectral range has been demonstrated.
Article
Engineering, Electrical & Electronic
Ziyang Xiong, Shan Gao, Binbing Li, Yan Liu, Ping Li, Jing Yang, Jinhui Shi, Libo Yuan, Chunying Guan
Summary: A temperature sensor based on side-polished two-core fiber Michelson interferometer has been demonstrated, showing high sensitivity and minimal influence from humidity, making it suitable for applications in industrial, chemical, pharmaceutical, and other fields.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Yuan Jin, Peng Ye, Jing Yang, Shan Gao, Feng Zou, Xuelan He, Zheng Zhu, Jinhui Shi, Libo Yuan, Chunying Guan
Summary: A vector bending sensor based on hole-assisted three-core fiber Mach-Zehnder interferometer is presented. The sensor includes multi-mode fiber HATCF MMF structure embedded between two single-mode fibers. The wavelength of the interference peak can be used to identify the bending curvature and direction, with a maximum bending sensitivity of -28.726 nm/m(-1) at a direction of 220 degrees. Additionally, the sensor exhibits a temperature sensitivity of 44 pm/degrees C and is not affected by external refractive index.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Optics
Yu Liu, Shan Gao, Jing Yang, Zhenyu Duan, Peng Ye, Linhui Cai, Zheng Zhu, Jinhui Shi, Jun Yang, Libo Yuan, Chunying Guan
Summary: A hole-assisted three-core fiber (HATCF) has been proposed as a sensor for simultaneous measurement of refractive index (RI) and temperature. By changing the phase matching wavelength between the center core and the suspended core, the measurement of the solution can be achieved, with advantages such as a simple structure, high integration, and dual parameter measurement.
Article
Optics
Yu Liu, Jing Yang, Yuxiao Xue, Shan Gao, Peixuan Tian, Peng Ye, Zhenyu Duan, Jinhui Shi, Jun Yang, Libo Yuan, K. T. V. Grattan, Chunying Guan
Summary: An optical fiber sensor based on a hole-assisted dual-core fiber has been proposed for dual-parameter measurements, achieving simultaneous measurement of salinity and temperature. The sensor offers advantages of simplicity in fabrication, high integration, and potential applications in marine environment measurements.
Article
Optics
Hongzhou Chen, Zhenyu Duan, Chunying Guan, Xixin Li, Shan Gao, Xiao Hu, Peng Ye, Jing Yang, Ping Li, Jinhui Shi, Libo Yuan
Summary: This study proposes a method that balances miniaturization and high performance of fiber optic speckle spectrometers. By using periodically tapered coreless fiber as the scattering element, high-resolution spectral reconstruction is achieved with significant improvement in device miniaturization.
Article
Optics
Qingdong Yang, Yi Wang, Jinhui Shi, Changxu Liu, Shuang Zhang
Summary: This study proposes a novel method for achieving arbitrary power distribution by leveraging the unique properties of an Epsilon Near Zero (ENZ) environment. It shows that power from a single source can be transferred to multiple receivers inside an ENZ medium by modifying the optical properties of the receivers. This approach eliminates the need for complex configurations and communications and enables efficient energy transfer.
LASER & PHOTONICS REVIEWS
(2023)
