Article
Engineering, Mechanical
A-Li Chen, Hua-Wei Zhang, Yue-Sheng Wang
Summary: This paper derives the expression of the generalized Snell's law for modulating the Rayleigh surface wave and proposes a reconfigurable elastic metasurface based on the screw-and-nut structure to modulate the wavefront of the Rayleigh surface wave. Flexible switching between different frequencies and functions can be achieved by adjusting the screw-in depths of the nuts.
EXTREME MECHANICS LETTERS
(2023)
Article
Optics
Haiyang Ren, Weiwei Yue, Jian Liu, Liyuan Liu, Zhaoxin Geng
Summary: A flexible metasurface based on parylene-C film was proposed in this study, featuring elliptical split-ring units that can function as 2D beam deflectors, 3D beam deflectors, or vortex generators in the THz band. The metasurface demonstrates broadband effects and enables modulation of THz waves for various applications in THz optical field modulation and communication.
OPTICS COMMUNICATIONS
(2022)
Article
Optics
Yilin Zheng, Shaojie Wang, Kun Duan, Weixu Yang, Ke Chen, Junming Zhao, Tian Jiang, Yijun Feng
Summary: Origami metasurfaces offer a versatile platform for manipulating electromagnetic waves due to their cost-effectiveness and lightweight nature. This study proposes an origami metasurface that achieves simultaneous tunable chirality and wavefront manipulation using a simple deformation method. By creating a 3D metasurface and implementing propagation phase design, the metasurface enables spin-selective modulation of reflection beam. The experimental results confirm the potential of this design for reconfigurable photonics devices.
LASER & PHOTONICS REVIEWS
(2023)
Article
Engineering, Mechanical
Zhu-Long Xu, Dan-Feng Wang, Yun-Fei Shi, Zheng-Hua Qian, Badreddine Assouar, Kuo-Chih Chuang
Summary: In this paper, an aperiodic elastic metasurface is proposed for arbitrary phase and amplitude modulation, using pillared resonators of different heights. The metasurface can achieve full transmission and steer flexural waves into different directions with different amplitudes. The inverse design method and aperiodic design have potential applications in other functional metasurfaces.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
Kai He, Tigang Ning, Jing Li, Li Pei, Jingjing Zheng, Jianshuai Wang, Bing Bai
Summary: A high-efficiency wavefront reconfigurable metasurface is proposed in this study, which features multiple optional functions, including perfect absorption, arbitrary multi-focus, and self-healing. Using resonant strategy in the THz frequency range, the designed metasurface can shape the wavefront at will without reconstituting the device's configuration. The reflected phase shifts exhibit active adjustable characteristics within the Fermi level range from 0 eV to 0.6 eV, corresponding to a phase coverage of 0 -2 pi. The proposed wavefront reconfigurable metasurface may open up new avenues for wave manipulation and have profound implications in optical communications.
RESULTS IN PHYSICS
(2023)
Article
Biophysics
A. M. Cusano, G. Quero, P. Vaiano, P. Cicatiello, M. Principe, A. Micco, M. Ruvo, M. Consales, A. Cusano
Summary: The study developed a label-free Lab-on-Fiber biosensing platform for highly sensitive detection of the major circulating form of vitamin D, 25(OH)D3. The platform combines plasmonic metasurfaces with optical fibers to enable direct and sensitive detection of 25(OH)D3 in clinically relevant ranges. This platform has the potential to be used in developing low-cost, fast, simple, and ready-to-use Point-of-Care diagnostic devices.
BIOSENSORS & BIOELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Ming Zhang, Peng Dong, Yu Wang, Baozhu Wang, Lin Yang, Ruihong Wu, Weimin Hou, Junyao Zhang
Summary: In this paper, a design for THz tunable wavefront manipulation achieved by the combination of plasmonic metasurface and phase change materials (PCMs) is proposed. The design allows for tunable reflective anomalous beam deflector and focusing metalens by utilizing the phase difference between the amorphous and crystalline states.
Article
Optics
Hai Xin, Jianing Yang, Ming-Chun Tang, Haochen Zhang, Zuojun Zhang, Meijun Qu
Summary: This paper presents a broadband, electrically controlled, reconfigurable, circularly polarized reflective metasurface. The chirality of the metasurface is changed by switching active elements, which is achieved through the tunable current distributions generated by an elaborately designed structure under x-polarized and y-polarized waves. The proposed metasurface unit cell demonstrates a good circular-polarization efficiency in a broad range of 6.82-9.96 GHz (37% fractional bandwidth) with a phase difference of pi between the two states. A simulation and measurement of a reconfigurable circularly polarized metasurface containing 8 x 8 elements was conducted, showing that the proposed metasurface can flexibly control circularly polarized waves and achieve beam splitting, mirror reflection, and other beam manipulations from 7.4 GHz to 9.9 GHz (28.9% fractional bandwidth) by adjusting the loaded active elements. The reconfigurable metasurface proposed in this study holds promise for electromagnetic wave manipulation or communication systems.
Article
Materials Science, Multidisciplinary
Chaohui Wang, He-Xiu Xu, Yanzhao Wang, Guangwei Hu, Huiling Luo, Kun Wang
Summary: Recently, researchers have developed reconfigurable metasurfaces that can manipulate electromagnetic waves dynamically, creating new possibilities for fascinating meta-devices. In this study, a reconfigurable multifunctional transmissive metasurface is demonstrated, capable of manipulating both linearly and circularly polarized waves. Through the use of a designed meta-atom, which includes dual-layer metallic cross-strips and one-layer circular slotted patch, multiple switchable states are achieved via different applied bias voltages, enabling high-rate transmission and individual phase manipulation in four independent transmission channels. Various versatile functionalities, such as anomalous deflections, orbital angular momentum generation, and beam focusing, are numerically and experimentally demonstrated at 7.4 GHz. This metasurface offers advantages in multi-polarization electromagnetic wave manipulations in transmission mode, distinguishing it from previous works focused on single polarization in reflection mode.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
Tao Yin, Jian Ren, Bing Zhang, Puchu Li, Yuchen Luan, Yingzeng Yin
Summary: This paper proposes a reconfigurable transmission-reflection-integrated (TRI) coding metasurface, which combines the functionalities of reconfigurable transmission and reflection metasurfaces. By dynamically controlling the states of PIN diodes, the meta-particles can switch between transmission mode and reflection mode and independently modulate phase response. Metasurfaces can manipulate the reflected and transmitted wavefront by array encoding, allowing for full-space control of the EM wavefront.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Optics
Yuzhong Wang, Cheng Pang, Jiaran Qi
Summary: This study develops a rotation-driven reconfigurable vectorial holography scheme using a dual-layer hybrid metasurface device and the gradient descent optimization inverse design method. Numerical analysis and experimental verification in the microwave region demonstrate the validity of this strategy for 3-D reconfigurable vectorial holography.
LASER & PHOTONICS REVIEWS
(2023)
Article
Materials Science, Multidisciplinary
Vladislav Popov, Badreddine Ratni, Shah Nawaz Burokur, Fabrice Boust
Summary: Metasurfaces have shown powerful abilities in manipulating electromagnetic waves, but conventional metasurfaces have limitations in efficiency due to local electromagnetic responses. The efficiency of reconfigurable metasurfaces decreases with high density of meta-atoms, prompting the implementation of sparse metasurfaces with strong electromagnetic non-local features for better performance. By experimentally realizing a dynamic sparse metasurface with as few as 8 meta-atoms per lambda(2) area, the door is opened to high-efficiency real-time reprogrammable functionalities in various applications such as beam manipulation and imaging holography.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Optics
Yi Xu, Kanpei Zheng, Jumei Shang, Weiming Yuan, Songnian Fu, Huihui Lu, Yuncai Wang, Yuwen Qin
Summary: This research demonstrates a new beam steering mechanism by utilizing wavefront shaping technology for reconfigurable beam steering. It is compatible with the electro-optic tuning mechanism and provides new insights for the development of beam steering photonic devices.
Article
Optics
Ahasan Ullah, Yi-Chieh Wang, Sanjida Yeasmin, Yijing Deng, Jun Ren, Yu Shi, Lei Liu, Li-Jing Cheng
Summary: This paper presents a novel photoinduced reconfigurable metasurface for high spatial resolution terahertz (THz) wave modulation. The metasurface overcomes the limitation of lateral diffusion and ensures conductivity, creating high-definition photoconductive patterns with excellent modulation depth and tunable central frequency. It bears important implications for the implementation of reconfigurable THz devices.
Article
Chemistry, Analytical
Ting Qian
Summary: This paper proposes a reconfigurable metasurface antenna for flexible scattering field manipulation using liquid metal, and experimentally validates its feasibility.
Article
Optics
Dongrui Xiao, Guoqing Wang, Feihong Yu, Shuaiqi Liu, Weijie Xu, Liyang Shao, Chao Wang, Hongyan Fu, Songnian Fu, Perry Ping Shum, Tao Ye, Zhangqi Song, Weizhi Wang
Summary: This paper proposes and experimentally demonstrates an optical curvature sensor with high resolution based on in-fiber Mach-Zehnder interferometer (MZI) and microwave photonic filter (MPF). The sensor achieves high-precision curvature measurement by studying the structure and operating principle of the in-fiber MZI, and explores the visibility of the interference spectrum and multiplexing demodulation. The results show that the sensitivity and resolution of the sensor have reached the highest level to date.
Article
Engineering, Electrical & Electronic
Yibin Liu, Weihao Lin, Mang Vai, Perry Ping Shum, Li-Yang Shao, Wei He, Shuaiqi Liu, Fang Zhao, Weizhi Wang, Yuhui Liu
Summary: This paper presents an electric field intensity sensor based on optical fiber, which utilizes photonic crystal fiber and liquid crystal to achieve high sensitivity and large bandwidth. The sensor obtains a high signal to noise ratio output spectrum through demodulation by an optical fiber ring laser. Compared with traditional sensors, this sensor has more than twice the sensitivity and good stability.
IEEE PHOTONICS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Xiaonan Jiang, Amir Khurrum Rashid, Wentao Xu, Qiang Cheng, Liyang Shao, Qingfeng Zhang
Summary: A new ultrawideband frequency selective surface (FSS) with six resonances for a flat passband is proposed. The structure is a three-dimensional configuration and can be assembled easily with single-layer PCB fabrication. The resonances are excited by a wire-loop conducting pattern and the dielectric, and combined to form an ultrawide frequency band from 7.53 to 29.45 GHz.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2022)
Article
Optics
Shuaiqi Liu, Liyang Shao, Fei-Hong Yu, Weijie Xu, Mang Vai, Dongrui Xiao, Weihao Lin, Jie Hu, Fang Zhao, Guoqing Wang, Weizhi Wang, Huanhuan Liu, Perry P. Shum, Feng Wang
Summary: This study proposes a Phi-OTDR-based method for quantitative demodulation of low-frequency vibrations using phase-shifted dual-pulse probes. Experimental results show high reconstruction accuracy and demodulation precision, making it suitable for distributed seismic or hydroacoustic wave acquisition.
Article
Chemistry, Analytical
Weijie Xu, Feihong Yu, Shuaiqi Liu, Dongrui Xiao, Jie Hu, Fang Zhao, Weihao Lin, Guoqing Wang, Xingliang Shen, Weizhi Wang, Feng Wang, Huanhuan Liu, Perry Ping Shum, Liyang Shao
Summary: This paper proposes a real-time multi-class disturbance detection algorithm based on YOLO for distributed fiber vibration sensing. The algorithm achieves real-time detection and classification of external intrusions sensed by distributed optical fiber sensing system (DOFS) based on phase-sensitive optical time-domain reflectometry (Phi -OTDR). The proposed model simplifies the traditional two-step object detection into a one-step process, using the Darknet53 network for both event localization and classification, resulting in improved detection speed and real-time operation. Experimental results show that this scheme provides a solution to real-time, multi-class external intrusion events detection and classification for practical applications of Phi -OTDR-based DOFS.
Article
Optics
Fei-Hong Yu, Shuaiqi Liu, Liyang Shao, Weijie Xu, Dongrui Xiao, Fang Zhao, Jie Hu, Weihao Lin, Guoqing Wang, Weizhi Wang, Feng Wang, Huanhuan Liu, Perry Ping Shum
Summary: This Letter proposes an ultra-low sampling resolution technique to solve the data storage problem in Phi-OTDR based on heterodyne detection. Experimental results demonstrate the successful demodulation of optical phase variations induced by external vibrations from 1-bit-resolution raw data.
Article
Engineering, Electrical & Electronic
Guoqing Wang, Yuan Zhou, Fang Zhao, Li-Yang Shao, Huanhuan Liu, Lipeng Sun, Shuming Jiao, Weizhi Wang, Rui Min, E. Du, Zhijun Yan, Chao Wang, Perry Ping Shum
Summary: Serial time-encoded amplified microscopy achieves ultrafast imaging speed in varied dynamic regimes, but faces challenges of high-throughput data and low-efficiency diffraction. In this study, we propose and confirm a compact and highly efficient optical imaging system based on compressive sensing and in-fiber grating. The system achieves a minimum data compression ratio of 5% and ultrafast imaging speeds of 10 Mfps and 1.25 Mfps, overcoming the big data issue and increasing energy efficiency.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Optics
Shangru Li, Dongrui Xiao, Shuaiqi Liu, Feihong Yu, Weijie Xu, Jie Hu, Siming Sun, Liyang Shao, Qingfeng Zhang
Summary: We propose a photonic time-stretched analog-to-digital converter (PTS-ADC) based on dispersion-tunable chirped fiber Bragg grating (CFBG), which demonstrates an economical ADC system with seven different stretch factors. The stretch factors, obtained by changing the dispersion of CFBG, can improve the total sampling rate of the system. With only a single channel, the sampling rate can be increased and achieve multi-channel sampling effect. The proposed scheme is suitable for commercial microwave radar systems, allowing for higher sampling rate at a lower cost.
Article
Optics
Yuhui Liu, Weihao Lin, Fang Zhao, Jie Hu, Jinna Chen, Huanhuan Liu, Perry Ping Shum, Xuming Zhang, Li-Yang Shao
Summary: In this study, a sensitive temperature and salinity sensor based on an optical fiber ring laser (FRL) cavity is proposed and demonstrated. The sensor achieves a salinity sensitivity of 0.173 nm/% and a temperature sensitivity of 0.306 nm/°C. It also has the advantages of simple design, low cost, and easy fabrication.
Article
Chemistry, Analytical
Penglai Guo, Huanhuan Liu, Zhitai Zhou, Jie Hu, Yuntian Wang, Xiaoling Peng, Xun Yuan, Yiqing Shu, Yingfang Zhang, Hong Dang, Guizhen Xu, Aoyan Zhang, Chenlong Xue, Jiaqi Hu, Liyang Shao, Jinna Chen, Jianqing Li, Perry Ping Shum
Summary: A fiber speckle sensor based on a tapered multimode fiber has been developed to measure liquid analyte refractive index. The sensor enhances the refractive index sensitivity and provides a resolution of 5.84 x 10(-5) over a linear response range. The results demonstrate the potential of the speckle sensor in image-based ocean-sensing applications.
Article
Chemistry, Analytical
Yuhui Liu, Weihao Lin, Jie Hu, Fang Zhao, Feihong Yu, Shuaiqi Liu, Jinna Chen, Huanhuan Liu, Perry Ping Shum, Xuming Zhang
Summary: By incorporating the Lyot-Sagnac loop structure, the Vernier effect is utilized to create an ultra-high sensitivity temperature sensor based on a ring laser cavity. By adjusting the welding angle between two polarization-maintaining fibers (PMFs), the sensor is fused into a single Sagnac loop to achieve effective temperature sensitivity amplification. The proposed sensor demonstrates superior performance compared to traditional fiber sensors.
Article
Chemistry, Analytical
Jie Hu, Enlai Song, Yuhui Liu, Qiaochu Yang, Junhui Sun, Jinna Chen, Yue Meng, Yanwei Jia, Zhiguang Yu, Yang Ran, Liyang Shao, Perry Ping Shum
Summary: Detection of trace tumor markers in blood/serum is important for cancer screening and prognosis, and label-free optical fiber-based biosensors show promise for Point-of-Care Testing (POCT). A lasso-shaped fiber laser biosensor was developed for the specific determination of CEACAM5 protein in serum, with high sensitivity and reproducibility. The biosensor demonstrated a LOD of 9.6 ng/mL and potential for clinical use, with mass production capability and applicability in broader biosensing fields.
Article
Engineering, Electrical & Electronic
Yifan Wang, Ziyu Hua, Jiachen Shi, Zongren Dai, Jiagang Wang, Liyang Shao, Yidong Tan
Summary: We propose and demonstrate a novel LiDAR system for 3-D imaging, combining LFI and FMCW. The system effectively enhances the amplitude of the generated beat signal, improving the sensitivity in weak-signal detection with low photon consumption. The system inherits the advantages of FMCW, measuring position and velocity simultaneously. Experimental results show valid distance and velocity measurement, and the system achieves high-quality 3-D imaging over 65 m away with a portable prototype.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)