Article
Physics, Applied
Jiuxu Wang, Guanhai Li, Kai Ou, Feilong Yu, Jin Chen, Zhifeng Li, Xiaoshuang Chen, Wei Lu
Summary: This study proposes a method to generate and control chiral emission using plasmonic chiral metasurfaces, achieving desired effects at specific wavelengths and directions. The research demonstrates the dependence of emission chirality on impacting positions and wavelengths, as well as insensitivity of chirality to impacting positions at specific wavelengths. Simulated far field intensity distributions confirm the approach to implement different chiral emissions.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Siyuan Shen, Zhaohui Ruan, Yuan Yuan, Heping Tan
Summary: This paper discusses the conditions for establishing the generalized Snell's law of refraction in all-dielectric metasurfaces, and summarizes the relationship between the highest achievable anomalous refraction efficiency and the number of nanoparticles. Additionally, conditions for establishing the polarization-independent generalized Snell's law of refraction are presented.
Article
Nanoscience & Nanotechnology
Maxim Gorkunov, Alena Mamonova, Irina Kasyanova, Alexander A. Ezhov, Vladimir V. Artemov, Ivan Simdyankin, Artur R. Geivandov
Summary: This study demonstrates the spatial modulation of transmitted light wavefronts by self-assembled liquid crystals on nanopatterned alignment layers. By using a double-sided metasurface design, the spectral range is expanded and additional functionality is acquired. The results show efficient and reversible light refraction within the visible wavelength range, as well as remarkable mechanical reconfigurability.
Article
Engineering, Electrical & Electronic
Lei Zhang, Ming Zheng Chen, Wankai Tang, Jun Yan Dai, Long Miao, Xiao Yang Zhou, Shi Jin, Qiang Cheng, Tie Jun Cui
Summary: Digitally programmable metasurfaces can be used for wireless communication to implement both space- and frequency-division multiplexing, encoding messages through multiple channels to transmit directly to different users at different locations simultaneously without the need for digital-to-analogue conversion and mixing processes. Using a dual-channel wireless communication system based on a two-bit space-time-coding digital metasurface, two different pictures were transmitted to two users simultaneously in real time.
NATURE ELECTRONICS
(2021)
Article
Physics, Multidisciplinary
Wen-Yu Li, Ran Sun, Jing-Yu Liu, Tian-Hua Meng, Guo-Zhong Zhao
Summary: Metasurfaces have the ability to manipulate electromagnetic waves, however, traditional devices suffer from low efficiency and narrow bandwidth. In this study, multilayered unit cells were designed to convert the polarization states of terahertz waves and maintain high cross-polarized transmission amplitudes in an ultra-wide frequency range. The constructed ultra-thin anomalous refraction metalens and vortex phase plate exhibited high efficiency and excellent propagation characteristics.
Article
Chemistry, Multidisciplinary
Wei Zhu, Yuancheng Fan, Ruisheng Yang, Guangzhou Geng, Quanhong Fu, Changzhi Gu, Junjie Li, Fuli Zhang
Summary: This article demonstrates silicon-based metasurfaces capable of generating versatile wavefronts under different polarization light incidence at visible wavelengths, with great potential for applications in integrated functional optical devices.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Zhening Fang, Haipeng Li, Yan Chen, Shulin Sun, Shiyi Xiao, Qiong He, Lei Zhou
Summary: This paper proposes a deterministic approach to design passive metasurfaces that can reflect impinging light to arbitrary nonspecular directions with almost 100% efficiencies. By matching boundary conditions and solving self-consistently with all allowed near-field modes based on given incident and out-going far-field waves, passive meta-atoms can be constructed and metadevices can be designed deterministically. Experimental results demonstrate the feasibility of this approach.
Article
Chemistry, Multidisciplinary
Qing'an Sun, Wangying Yang, Lei Jin, Jingcheng Shangguan, Yilin Wang, Tong Cui, Kun Liang, Li Yu
Summary: A simple and reliable method for generating multichannel optical vortices on gold nanoporous metasurfaces is reported in this paper. The instantaneous field of arbitrary-order optical vortices can be regulated and concentrated by adapting photonic spin-orbit interaction and geometric phase.
Article
Nanoscience & Nanotechnology
Xiaoping He, Guozhou Li, Dong Wu
Summary: Dynamic plasmonic colors have great potential in various fields, but obtaining high-efficiency and high-purity colors is still a challenge. This study proposes a cross-polarization strategy and controlling the deformation of a PDMS film to achieve directional and fast-changing plasmonic colors. The results show that this method can produce high-efficiency, high-purity, and controllable colors, while significantly improving the scanning speed compared to current technology.
Article
Materials Science, Multidisciplinary
Yong-Qiang Liu, Wenqiang Chen, Xuemei Du, Yingchao Shu, Lujun Wu, Zhongru Ren, Hongcheng Yin, Jinhai Sun, Kainan Qi, Yongxing Che, Liangsheng Li
Summary: This paper presents an ultrathin plasmonic metalens with high transmissive efficiency and focusing efficiency, which can play a significant role in the low frequency range. By changing the cell size on the lens surface, an ultra-thin metalens with a thickness of only 0.1 times the working wavelength is designed. Experimental results show that the metalens achieves 80% transmissive efficiency and 50% focusing efficiency on the focal plane. The influence of the open angle of the symmetric split ring transmitarray metasurface on the focusing performance of the metalens is also studied and analyzed, providing new insights for optimizing its performance.
RESULTS IN PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Maria Benetou, Kosmas L. Tsakmakidis
Summary: The researchers have successfully created periodically perforated plasmonic metasurfaces with various key functionalities, operating at telecom wavelengths. These metasurfaces can be adjusted for different parameters and could be used for sensing and optical signal processing applications.
Review
Nanoscience & Nanotechnology
Siqi Liu, Zhenyu Ma, Jian Pei, Qingbin Jiao, Lin Yang, Wei Zhang, Hui Li, Yuhang Li, Yubo Zou, Xin Tan
Summary: This paper summarizes the current research progress on abnormal refractive and reflective metasurfaces and discusses their types, applications, and future development. It also highlights the technical obstacles faced by existing technology and prospects for future development and applications of abnormal refractive and reflective metasurfaces.
NANOTECHNOLOGY AND PRECISION ENGINEERING
(2022)
Article
Optics
Xiuyu Wang, Xiaoman Wang, Jihong Xin, Jitao Li, Qun Ren, Haocheng Cai, Yuxin Lang, Zhihao Lan, Yuqi Jia, Ruiqi Jin, Yuqing He, Jian Wei You, Wei E. I. Sha, Yanwei Pang
Summary: Metasurfaces offer new opportunities for applications in nonlinear optics, plasmonics and electromagnetics by controlling and enhancing nonlinear effects at the nanoscale. This paper proposes a tri-capacitance-like metasurface that generates multiple high-Q resonances, which can significantly improve the second order nonlinear efficiency and facilitate sum and difference frequency generation.
OPTICS COMMUNICATIONS
(2023)
Article
Automation & Control Systems
Zhichao Hua, K. T. Chau, Wei Han, Wei Liu, T. W. Ching
Summary: This article proposes and implements an output-controllable efficiency-optimized wireless power transfer scheme using hybrid modulation. The scheme combines pulse frequency modulation (PFM) and ON-OFF keying (OOK) modulation and utilizes feedback control to maintain high system efficiency during the output voltage regulation process.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Yasin Celik, Sultan Aldirmaz-Colak
Summary: The proposed EFIQSSK modulation scheme combines EQSM and FIQSSK to achieve high bit rates using only antenna indices. It can be implemented with any number of antennas and has low complexity. Monte Carlo simulations show that it outperforms other schemes in the literature with the same spectral efficiency, particularly when using 3 or more transmit antennas.
SIGNAL IMAGE AND VIDEO PROCESSING
(2022)
Article
Optics
Song Gao, Changyi Zhou, Wenwei Liu, Wenjing Yue, Shuqi Chen, Sang-Shin Lee, Duk-Yong Choi, Yang Li
Summary: In this study, a double dielectric metasurface based on two polarization-filtering meta-atoms is proposed as an efficient and simple solution to address the challenges of multilayered metallic metasurfaces in the visible band. The presented double dielectric metasurface exhibits multiple functionalities and significant advantages over traditional metallic metasurfaces in terms of design complexity, efficiency, and fabrication.
LASER & PHOTONICS REVIEWS
(2022)
Article
Physics, Applied
Zhancheng Li, Wenwei Liu, Dina Ma, Shiwang Yu, Hua Cheng, Duk-Yong Choi, Jianguo Tian, Shuqi Chen
Summary: Few-layer metasurfaces, artificial arrays composed of multiple functional layers, have the potential for integrated and miniaturized optical devices. This study presents an inverse design strategy based on deep-learning technology, which reduces the complexity and time cost of structural optimization.
PHYSICAL REVIEW APPLIED
(2022)
Article
Optics
Bo Yang, Dina Ma, Wenwei Liu, Duk-Yong Choi, Zhancheng Li, Hua Cheng, Jianguo Tian, Shuqi Chen
Summary: This research proposes a direct polarization detection method based on colorimetric asymmetrical all-dielectric metasurfaces, which can accurately measure the polarization angles of light. The double-layer nanopillars with independently tunable periods and diameters enable high-performance dual-color palettes, and the polarization detection network based on deep learning can accurately recognize slight polarization variations.
Article
Materials Science, Multidisciplinary
Zhancheng Li, Guangzhou Geng, Jiaqi Cheng, Wenwei Liu, Shiwang Yu, Boyang Xie, Hua Cheng, Junjie Li, Wenyuan Zhou, Jianguo Tian, Shuqi Chen
Summary: This paper investigates the feasibility of using nano rectangular hollow (NRH) metasurfaces to confine and manipulate Mie resonances in the frequency domain through theoretical and experimental analyses. By adjusting the diameter and side length of the NRH, the authors demonstrate the confinement of Mie resonances and manipulation of excitation wavelength. The potential applications of NRH metasurfaces in frequency-selective intensity encoding and optical encryption are presented.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Dina Ma, Zhancheng Li, Wenwei Liu, Guangzhou Geng, Hua Cheng, Junjie Li, Jianguo Tian, Shuqi Chen
Summary: This study proposes a hybrid framework based on a neural network and an evolutionary strategy for the inverse design of nanostructures with desired characteristics. By precisely controlling the resonance wavelength and bandwidth of the nanostructures, crosstalk between different wavelength channels can be eliminated, achieving the concept validation of multicolor meta-holography.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Leixin Liu, Wenwei Liu, Fei Wang, Hua Cheng, Duk-Yong Choi, Jianguo Tian, Yangjian Cai, Shuqi Chen
Summary: This study successfully manipulates the spatial coherence of light fields by loading different random phase distributions onto the wavefront, thereby generating partially coherent light with a predefined degree of coherence. This design strategy can easily be applied to manipulate arbitrary phase-only special beams with the same degree of coherence.
Article
Optics
Xi Zhao, Zhancheng Li, Jiaqi Cheng, Wenwei Liu, Shiwang Yu, Yuebian Zhang, Hua Cheng, Jianguo Tian, Shuqi Chen
Summary: This study utilizes dielectric bilayer polyatomic metasurfaces to achieve the maximum optical intrinsic chirality over a wide bandwidth range, providing a new method for spin-selective optical wave manipulation.
Article
Materials Science, Multidisciplinary
Jiaqi Cheng, Zhancheng Li, Duk-Yong Choi, Shiwang Yu, Wenwei Liu, Haoyu Wang, Yuebian Zhang, Hua Cheng, Jianguo Tian, Shuqi Chen
Summary: A new design strategy based on the collective interference effect in diatomic metasurfaces is proposed to achieve full and subtle intensity manipulation of circularly polarized optical waves. This design approach allows for convenient control of the reflection intensity of circularly polarized waves by changing a single structural parameter in the diatomic metasurface. The proposed approach has been experimentally demonstrated to enable high-level grayscale imaging with subwavelength spatial resolution, showing promise for advanced display and information encryption applications.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Yifan Jiang, Wenwei Liu, Zhancheng Li, Duk-Yong Choi, Yuebian Zhang, Hua Cheng, Jianguo Tian, Shuqi Chen
Summary: Optical chirality, which plays an important role in physical photonics, biochemical processes, and molecular recognition, has recently been manipulated through the asymmetric optical responses of chiral nanostructures. This study introduces a design strategy to achieve spin-selective coding metasurfaces using amorphous silicon resonators with C-2 symmetry. The chiral coding metasurface allows for significant chiral transmission and wavefront control, expanding the information capacity in optical systems for both linear and nonlinear regimes.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Physics, Applied
Zhancheng Li, Yifan Jiang, Wenwei Liu, Yuebian Zhang, Hua Cheng, Junjie Li, Jianguo Tian, Shuqi Chen
Summary: We demonstrate that hybrid bilayer plasmonic metasurfaces, fabricated through a simple one-step nanofabrication process, are ideal candidates for realizing intrinsic chiral optical responses and spin-selective transmission. The proposed metasurfaces offer advantages such as compact design, easy control of chiral optical response, and lower fabrication demand, thus expanding the application potential of chiral plasmonic nanostructures in spin nanophotonics, nonlinear optics, and optical sensing.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Ziwei Zhu, Zhaocheng Liu, Changxi Zheng
Summary: We propose a fully differentiable framework that seamlessly integrates wave optical components with geometrical lenses, providing a method to enhance the performance of large-scale end-to-end optical systems. In this study, we focus on the integration of a metalens, a geometrical lens, and image data. Through the use of gradient-based optimization techniques, we demonstrate the design of nonparaxial imaging systems and the correction of aberrations inherent in geometrical optics. Our framework enables efficient and effective optimization of the entire optical system, leading to improved overall performance.
Proceedings Paper
Computer Science, Artificial Intelligence
Yingtao Luo, Zhaocheng Liu, Qiang Liu
Summary: Researchers propose a method called Causal Healthcare Embedding (CHE) to improve the prediction accuracy of deep learning models on patients' Electronic Health Records (EHR) by eliminating spurious relationships between diagnoses and procedures. Extensive experiments show that CHE significantly improves the performance of deep learning models on out-of-distribution data and leverages causal structures for more reasonable predictions of historical records.
2022 IEEE INTERNATIONAL CONFERENCE ON DATA MINING (ICDM)
(2022)
