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
Materials Science, Multidisciplinary
Jinglin He, Zhuolin Shi, Sheng Ye, Minhua Li, Jianfeng Dong
Summary: A reconfigurable bi-functional metasurface is proposed in this paper, which can switch between transmission and absorption modes in a specific wavelength range using phase-change material, and its response is independent of the polarization of the incident wave.
RESULTS IN PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Kentaro Nishida, Koki Sasai, Rongyang Xu, Te-Hsin Yen, Yu-Lung Tang, Junichi Takahara, Shi-Wei Chu
Summary: In this paper, we demonstrated the photothermal nonlinearities of a quasi-perfect absorbing silicon-based metasurface with lambda/7 thickness through theoretical and experimental approaches. Laser irradiation efficiently heats up the metasurface, which modulates the scattering spectra via thermo-optical effect. By exciting the metasurface with a few milliwatts of continuous-wave laser at its resonance wavelength, the backward scattering cross-section doubles while the forward scattering cross-section is reduced by half. Our findings pave the way for all-optical dynamical control of scattering directionality in silicon photonic devices.
Article
Chemistry, Multidisciplinary
Qi Wu, Wenhui Fan, Chong Qin
Summary: Terahertz orbital angular momentum (OAM) technology has promising applications in future wireless communication. However, the conventional THz vortex beam is limited in co-propagation of multiple OAM modes. In this study, we demonstrate two perfect vortex beam (PVB) generators based on all-dielectric metasurfaces for polarization-independent PVB and spin multiplexed PVB, respectively. Moreover, we propose a method to generate stable perfect Poincare beams with arbitrary polarization and phase distribution on a hybrid-order Poincare Sphere using spin-decoupled metasurfaces. This research provides a compact and efficient platform for PVB generation and superposition in the THz region.
Article
Multidisciplinary Sciences
Mingze Liu, Pengcheng Huo, Wenqi Zhu, Cheng Zhang, Si Zhang, Maowen Song, Song Zhang, Qianwei Zhou, Lu Chen, Henri J. Lezec, Amit Agrawal, Yanqing Lu, Ting Xu
Summary: The authors successfully demonstrate the generation of a generalized perfect Poincare beam with a wide spectrum using an all-dielectric metasurface platform, where the beam radius is independent of the topological charge number. This approach opens up new possibilities for optical information encryption.
NATURE COMMUNICATIONS
(2021)
Article
Optics
Peng Luo, Guilian Lan, Jinpeng Nong, Xiaojian Zhang, Ting Xu, Wei Wei
Summary: A tungsten-based metamaterial absorber for broadband coherent perfect absorption (CPA) was proposed using genetic algorithm inverse design, offering wide tunability and exceptional angular stability. It has potential applications in optical signal processing chips, all-optical modulators, and optical switchers.
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
Nanoscience & Nanotechnology
Yash D. Shah, Adetunmise C. Dada, James P. Grant, David R. S. Cumming, Charles Altuzarra, Thomas S. Nowack, Ashley Lyons, Matteo Clerici, Daniele Faccio
Summary: A new all-dielectric metapolarimeter is introduced in this research for direct measurement of any arbitrary polarization state with high resolution and fidelity. This has significant implications for polarization imaging and quantum state tomography.
Article
Multidisciplinary Sciences
Changqing Wang, William R. Sweeney, A. Douglas Stone, Lan Yang
Summary: Exceptional points, degeneracies in open wave systems, have been observed in photonics, acoustics, and electronics. In addition to resonant degeneracy, an absorbing exceptional point with distinct physical features can be realized by engineering degeneracies in the absorption spectrum of dissipative optical microcavities. The distinct scattering properties of an absorbing exceptional point provide opportunities for fundamental study and applications of non-Hermitian degeneracies.
Article
Chemistry, Multidisciplinary
Raktim Sarma, Jiaming Xu, Domenico de Ceglia, Luca Carletti, Salvatore Campione, John Klem, Michael B. Sinclair, Mikhail A. Belkin, Igal Brener
Summary: This study focuses on optimizing the electromagnetic modes in meta-atoms and engineering material nonlinearities at the nanoscale to enhance the efficiency of second-harmonic generation using all-dielectric metasurfaces. By simultaneously optimizing heterostructures and meta-atoms, an all-dielectric polaritonic metasurface with high second-harmonic generation power conversion factor and power conversion efficiencies is experimentally realized. These results open up a new direction for designing efficient nonlinear all-dielectric metasurfaces for classical and quantum light sources.
Article
Chemistry, Physical
Marian Baah, Alesia Paddubskaya, Andrey Novitsky, Nadzeya Valynets, Mukesh Kumar, Tommi Itkonen, Markku Pekkarinen, Ekaterina Soboleva, Erkki Lahderanta, Maria Kafesaki, Yuri Svirko, Polina Kuzhir
Summary: A novel technique involving 3D printing, electroplating, and chemical vapor deposition was used to fabricate a polymer nanomembrane covered with multilayered graphene, showing nearly perfect absorption in the THz frequency range. The theoretical explanation provided insights into the dark mode formation of the metasurface, enabling potential applications in various fields requiring graphene/polymer nanomembranes.
Article
Optics
Wanli Zhao, Ming Chen, Xiangyang Wang, Wenhao Han, Renjie Li, Xinyu Shi, Jinbiao Liu, Chuanxin Teng, Shijie Deng, Libo Yuan
Summary: In this study, we propose a multidimensional tunable chiral graphene metasurface that achieves high circular conversion dichroism (CCD) at 2.4 THz using coherent control. The device has a tunable operating frequency and nearly perfect modulation depth, and it exhibits advantages in differential absorption mechanism and near-field imaging.
Article
Optics
Zhao Chen, Yudong Weng, Junku Liu, Nan Guo, Yaolun Yu, Lin Xiao
Summary: In this study, a dual-band perfect absorber for mid-infrared detectors based on dielectric metal metasurfaces is theoretically demonstrated. The absorber shows two narrow absorption peaks with high absorption values, and a thermal detector with fast response time is realized at room temperature. This research provides a promising approach for designing high-performance photodetectors in nano-integrated photonics.
PHOTONICS RESEARCH
(2021)
Article
Optics
Baoku Wang, Ke Gai, Ruoxing Wang, Fei Yan, Li Li
Summary: This paper presents an interesting scheme of an ultra-broadband perfect terahertz (THz) absorber using a periodic-conductivity graphene metasurface. By modulating the conductivity of graphene in a periodic manner, the absorber can generate dense high-order resonance modes and achieve ultra-broadband continuous absorption. This scheme is significant for the development of broadband THz absorbers and has promising application prospects in THz stealth, imaging, and communication fields.
OPTICS AND LASER TECHNOLOGY
(2022)
Correction
Optics
Bolun Zhang, Zheng-Da Hu, Jicheng Wang, Jingjing Wu, Tian Sang
Summary: There are some mistakes in this paper that need to be revised.
Article
Engineering, Electrical & Electronic
Zhenfei Li, Dajun Zhang, Ji Liu, Jin Zhang, Linda Shao, Xiong Wang, Ronghong Jin, Weiren Zhu
Summary: This article reports an advanced strategy for the 3-D manipulation of dual-helical electromagnetic wavefronts using a noninterleaved multitasked metaplexer. The strategy involves designing metasurface phase distribution and spin-decoupled meta-atoms to encode different image information into circularly polarized waves at different planes. The proposed strategy has potential applications in MIMO communications, radar detection, information storage, and 3-D microwave imaging.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Nanoscience & Nanotechnology
Xudong Bai, Fuli Zhang, Li Sun, Anjie Cao, Chong He, Jin Zhang, Weiren Zhu
Summary: In this paper, a programmable metasurface is proposed to stimulate dynamic multi-mode mmWave vortex beams. By modulating the real-time coding distribution on the metasurface, the generation of mmWave OAM beams with different mode numbers is designed and experimentally verified. This study provides a new perspective for the cross amalgamation of mmWave and multi-mode OAM technologies.
Article
Multidisciplinary Sciences
Xudong Bai, Fuli Zhang, Li Sun, Anjie Cao, Jin Zhang, Chong He, Longhai Liu, Jianquan Yao, Weiren Zhu
Summary: This paper introduces a time modulation strategy for reducing the sidelobe levels of 1-bit transmissive programmable metasurfaces, achieving remarkable improvements in phase shift accuracy and sidelobe levels through high-speed modulation of coding sequences.
Article
Nanoscience & Nanotechnology
Jin Zhang, Zhenfei Li, Chiben Zhang, Linda Shao, Weiren Zhu
Summary: This paper presents a general strategy for designing a graphene-based active meta-device for dynamic polarization control at microwave frequencies, and the simulated and measured results demonstrate its feasibility and potential applications.
NPJ 2D MATERIALS AND APPLICATIONS
(2022)
Article
Biophysics
Chiben Zhang, Tingjia Xue, Jin Zhang, Zhenfei Li, Longhai Liu, Jianhua Xie, Jianquan Yao, Guangming Wang, Xiaodan Ye, Weiren Zhu
Summary: This study presents a strategy for enhancing the Q factor of electrical resonance through the interference of a toroidal dipole. An experimental biosensor for detecting lung cancer cells was developed based on the proposed metasurface, and the dielectric permittivity of the cells was estimated using simulated and measured results.
BIOSENSORS & BIOELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Zhenfei Li, Jurui Qi, Wenman Hu, Ji Liu, Jin Zhang, Linda Shao, Chiben Zhang, Xiong Wang, Ronghong Jin, Weiren Zhu
Summary: In this paper, a dispersion-assisted dual-phase hybrid strategy is proposed for dual-frequency independent control of amplitude and phase. By controlling dispersion and energy allocation, frequency and phase decoupling is achieved, and the design and verification of dual-frequency multi-focal point are demonstrated.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Mengmeng Sun, Jingyi Qian, Xudong Bai, Liguo Zhou, Yanting Lv, Fanwei Kong, Weiren Zhu, Ronghong Jin
Summary: This letter presents compact hybrid choke rings to improve the performance of a dual-band circularly polarized GPS antenna. The choke rings effectively reduce radiation back lobes and improve the front to back ratio. The measured results demonstrate good return loss and bandwidth coverage for GPS L2 and GPS L1 frequencies, along with a high front to back ratio.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Optics
L. I. N. D. A. Shao, Z. H. E. N. F. E. I. LI, J. I. A. L. I. N. Feng, J. I. N. Zhang, H. O. N. G. Y. U. Shi, X. U. D. O. N. G. Bai, W. E. I. R. E. N. Zhu
Summary: This article proposes a general method for independent wavefront manipulation in a single polarization-multiplexing transmissive metasurface and demonstrates it with a transmission-type anisotropic metasurface. The measured results validate the independent wavefront manipulations with arbitrary polarization conversions. Compared to traditional meta-devices, the polarization-multiplexed metasurfaces with mixed polarization and phase control greatly enhance the system's functionality.
PHOTONICS RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Zhenfei Li, Jin Zhang, Ji Liu, Longhai Liu, Xiong Wang, Malin Premaratne, Jianquan Yao, Weiren Zhu
Summary: Introduces a novel strategy of multiplexing metasurface with non-interleaved meta-atoms array, which fully explores wave propagation direction and distance degrees of freedom. The design utilizes complex-amplitude encoding method and transmission-reflection selective meta-atom to shape wavefront and increase the propagation direction degrees of freedom. A six-channel metasurface is experimentally generated, capable of reconstructing aperture-field printing image and radiation-field holographic image simultaneously in different modes.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Chemistry, Physical
Qingge Li, Jin Zhang, Ivan D. Rukhlenko, Weiren Zhu
Summary: This study reports on a graphene-based absorbing metasurface capable of independent dynamic control of reflection amplitude and resonance frequency. Numerical simulations and experiments demonstrate that changing the resistance of the graphene sheet allows for significant amplitude change and frequency shift in the reflected waves.
Article
Materials Science, Multidisciplinary
Faizan Faraz, Yuanqing Huang, Haoyang Liu, Taufeeq Ur Rehman Abbasi, Xiong Wang, Liming Si, Weiren Zhu
Summary: This work demonstrates a highly efficient dual-band metasurface with independent phase responses for structures with different-fold rotational symmetries. By rotating the resonators within the unit cell, highly efficient independent full phase controls can be achieved with circularly polarized incident waves. A metasurface prototype is fabricated and experimentally tested by generating independent holographic images to validate the design paradigm.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Chiben Zhang, Tingjia Xue, Jin Zhang, Longhai Liu, Jianhua Xie, Guangming Wang, Jianquan Yao, Weiren Zhu, Xiaodan Ye
Summary: In this study, a novel label-free and low-cost strategy for rapid detection and distinction of lung cancer cells using plasmonic toroidal metasurfaces at terahertz frequencies is proposed. This strategy shows potential for clinical diagnosis and expands the capabilities of plasmonic metamaterials in biological detection.
Article
Optics
Linda Shao, Jin Zhang, Ivan D. Rukhlenko, Weiren Zhu
Summary: This article reviews the recent progress in tunable and reconfigurable metasurfaces, discussing the engineering approaches, programmable metasurfaces, and time-modulated metasurfaces.
CHINESE OPTICS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Xinyun Song, Xudong Bai, Weiren Zhu
Summary: A varactor-based metasurface is proposed in this paper for dynamic and continuous modulation of reflection, transmission, and absorption. By controlling the bias voltages applied to the varactors, nearly full-range and continuous modulation of reflection, transmission, and absorption can be achieved.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Linda Shao, Dajun Zhang, Ji Liu, Jin Zhang, Zhenfei Li, Xiong Wang, Weiren Zhu
Summary: A general method for generating multiband vector beam conversion using noninterleaved metasurfaces is proposed in this study. A novel meta-atom with nested resonators is designed to achieve full 2π phase modulations at multiple frequencies, enabling independent phase modulations by adjusting resonator orientations. As a proof of concept, a triband metasurface is numerically investigated and experimentally verified to generate azimuthally, radially, and hybrid polarized vector beams at different frequencies.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
