Article
Optics
Ran Ning, Dayong Wang, Lu Rong, Jie Zhao, Yunxin Wang, Shufeng Lin
Summary: This Letter proposes a binary diffractive lens for a scanning imaging system working at 278.6 GHz, which generates a converging beam with a waist diameter of 0.65 mm and achieves a lateral imaging resolution of 1 mm. This low-cost terahertz lens, constituted by concentric rings with different radii, is optimized by stimulated annealing algorithm and fabricated by three-dimensional printing. Compared with the conventional transmissive convex lens, it achieves higher resolution and enhanced imaging quality through a smaller focal spot of the illumination beam. This type of lens would promote terahertz imaging closer to practical applications such as nondestructive testing and other scenarios.
CHINESE OPTICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Ayato Iba, Makoto Ikeda, Valynn Katrine Mag-usara, Verdad C. Agulto, Makoto Nakajima
Summary: This paper presents a metamaterial-based super-oscillatory lens capable of generating sub-wavelength focal points at sub-THz frequencies, which is highly effective for industrial inspection applications utilizing terahertz waves.
APPLIED SCIENCES-BASEL
(2022)
Article
Thermodynamics
Peng Li, Zhenghua Qian, Bin Wang, Iren E. Kuznetsova, Vladimir Kolesov
Summary: A plane lens has been successfully designed to focus flexural waves from a point source using both trajectory prediction and phase modulation. The lens can significantly increase wave energy at the focal point, and is able to work efficiently within a broadband range centered on the designed frequency.
Article
Engineering, Electrical & Electronic
Yin Wang, Hong-Yu Zou, Yu-Jing Lu, Shuai Gu, Jiao Qian, Jian-Ping Xia, Yong Ge, Hong-Xiang Sun, Shou-Qi Yuan, Xiao-Jun Liu
Summary: The study of acoustic vortex beams has garnered significant attention due to its potential applications in medical ultrasound imaging and particle trapping. However, designing a two-dimensional device with acoustic asymmetric vortex focusing (AAVF) remains challenging. In this study, we experimentally demonstrate a 2D AAVF lens composed of three types of binary-phase mode converters, which enables vortex focusing and asymmetric transmission in three-dimensional space. The proposed lens offers high-performance AAVF, broad bandwidth, and complex sound modulation capabilities, making it suitable for the design of 3D multi-functional sound devices with promising applications in medical ultrasound.
PROGRESS IN ELECTROMAGNETICS RESEARCH-PIER
(2023)
Article
Engineering, Electrical & Electronic
Zhe Wang, Junwen Zhang, Zhixue He, Peng Zou, Nan Chi
Summary: The paper proposes the SIM-SCAP modulation scheme to enhance the spectral efficiency and energy efficiency in bandlimited visible light communication systems, achieving around 30% SE enhancement compared to existing schemes. ICI mitigation further improves the throughput performance of the SIM-SCAP scheme, making it a promising candidate in designing bandlimited multi-user access optical communication systems.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Zhitong Sun, Jiahao Zhi, Yuanlu Chen, Bijun Xu, Zhifang Qiu, Xiaogang Wang, Xinning Yu
Summary: Unlike other methods that only modify the phase of cross-polarization components, this paper presents a novel concept for multifunctional manipulation of a metasurface through full-phase modulation. This method allows for simultaneous and independent amplitude and phase control of both co- and cross-polarization components of circularly polarized waves. Experimental results at 980nm wavelength demonstrate the feasibility of this complex amplitude control method for circularly polarized light (left or right circularly polarized).
RESULTS IN PHYSICS
(2023)
Article
Optics
Ruijuan Liu, Yudi Ma, Lingjing Ji, Liyang Qiu, Minbiao Ji, Zhensheng Tao, Saijun Wu
Summary: We propose a composite acousto-optical modulation scheme for wide-band, efficient modulation of CW and pulsed lasers. By adjusting the amplitudes and phases of weakly-driven daughter AOMs, diffraction beyond the Bragg condition can be achieved with exceptional efficiencies. High contrast switching of output orders can be achieved by imaging pairs of AOMs with opposite directions of sound-wave propagation, enabling efficient bidirectional routing of a synchronized mode-locked laser.
Article
Optics
L. Fan, X. I. L. I. N. Long, J. U. N. Dai, C. H. O. N. G. LI, X. I. A. O. W. E. N. Dong, Jian-jun He
Summary: This paper proposes an optical-electronic hybrid convolutional neural network system for real-time optical computing. A complex-valued modulation method based on liquid-crystal-on-silicon spatial light modulator and diffractive optical element is proposed and its feasibility is demonstrated. A hybrid CNN model with multiple channels achieves high classification accuracy on various tasks and outperforms models using only amplitude or phase modulation.
Article
Materials Science, Multidisciplinary
Chaohua Tan, Na Li, Datang Xu, Zhiming Chen
Summary: In this study, we theoretically investigate the spatial focusing of surface polaritons (SPs) in a negative index metamaterial-atomic gas interface waveguide system using cross phase modulation (XPM) in a double electromagnetically induced transparency (EIT) scheme. We demonstrate low-loss stable propagation of SPs in the linear region and show giant enhancement of XPM in the nonlinear region, allowing for spatial focusing of SPs solitons. The results have certain theoretical significance for nano-scale sensing, spectral enhancement, and precision measurement.
RESULTS IN PHYSICS
(2021)
Article
Chemistry, Physical
Huixia Jiang, Lili Sheng, Yumei Luo, Liang Meng, Weiping Cao
Summary: Due to the scarcity of spectrum resources in the low-frequency band, there is an urgent need for beam-reconfigurable antennas in the millimeter wave band. This paper proposes a W-band graphene-based metasurface with reflective amplitude coding, which can modulate the reflective amplitude and phase through adjusting the Fermi levels of graphene. The metasurface achieves amplitude-phase modulation in a significantly wide bandwidth and allows for multi-beam switching and beam deflection in far-field.
Article
Optics
Pengcheng Zheng, Zhaoxiang Zhu, Xiangcan Pei, Qinfei Wu, Haowen Liang, Yujie Chen, Juntao Li, Xiangsheng Xie
Summary: A single compound super-oscillation lens (SOL) is proposed to achieve reflective confocal imaging without additional lenses. The SOL consists of an outer lens and an inner lens, acting as focusing and collective lenses respectively, achieving simultaneous focusing and collecting functions. The improved system demonstrates excellent imaging performance with ultra-high resolution (< 0.3142/NA), negligible side lobe ratio, and no side bands, surpassing conventional laser scanning confocal microscopy and single SOL. This technology holds great potential for applications in super-resolution imaging and biomedical sciences.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Chemistry, Analytical
Amirhossein Sadeghian, Subhasisa Nath, Yuze Huang, Ranveer S. Matharu, Noppawee Wadee, Nicolas Pembrey, David G. Waugh
Summary: This study demonstrates the control of laser weld quality and dimensions for Cu-Cu joining by using laser beam oscillation parameters, and reveals the effect of oscillating amplitude and frequency on weld width and penetration.
Article
Physics, Multidisciplinary
Xin-Peng Li, Rui-Jie Cao, Ming Li, Ge-Pu Guo, Yu-Zhi Li, Qing-Yu Ma
Summary: A super-resolution acoustic focusing method is proposed based on the superposition of multi-frequency super-oscillation beams and the Particle Swarm Optimization (PSO), which can improve spatial resolution and controllability simultaneously.
ACTA PHYSICA SINICA
(2022)
Article
Thermodynamics
Peng Li, Zhi Qian, Yinghong Zhang, Tingfeng Ma, Iren E. Kuznetsova, Zhenghua Qian, Vladimir Kolesov
Summary: In this paper, two lenses are designed based on the phase modulation mechanism to focus flexural waves. Two design schemes are adopted to change the propagation distance or the phase velocity in the lens. The lenses are finalized via theoretical analysis, confirmed by FEM simulations and validated through experimental measurements. The results demonstrate successful subwavelength focusing and the ability to manipulate energy focusing.
Article
Engineering, Electrical & Electronic
Chao Zhang, Zheyuan Zhang, Yuchen Tian, Sze Yun Set, Shinji Yamashita
Summary: This article discusses the challenges and proposed solutions for high-precision 3-D measurement using an AMCW laser scanner, including dual-frequency modulation technology and data processing methods, effectively overcoming the tradeoff between longitudinal resolution and unambiguous range, as well as addressing phase jumps caused by scanning range exceeding the unambiguous range.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
Article
Engineering, Electrical & Electronic
Chen Peng, Haijun Zhou, Liguo Zhu, Tao Chen, Lianghui Du, Yu Zhu, Yi Zou, Qixian Peng, Gang Chen, Zeren Li
IEEE PHOTONICS TECHNOLOGY LETTERS
(2018)
Article
Optics
Yuyan Li, Luyao Cao, Zhongquan Wen, Chunyan Qin, Unbo Yang, Zhihai Zhang, Gaofeng Liang, Zhengguo Shang, Kun Zhang, Shuo Zhang, Luru Dai, Gang Chen
Article
Optics
Gaofeng Liang, Xi Chen, Zhongquan Wen, Gang Chen, L. Jay Guo
Article
Engineering, Electrical & Electronic
Chen Peng, Yuankun Sun, Liguo Zhu, Tao Chen, Gang Chen, Anping Yu, Sencheng Zhong, Pingwei Zhou, Zhaohui Zhai, Zeren Li
IEEE PHOTONICS JOURNAL
(2019)
Article
Optics
Michael Berry, Nikolay Zheludev, Yakir Aharonov, Fabrizio Colombo, Irene Sabadini, Daniele C. Struppa, Jeff Tollaksen, Edward T. F. Rogers, Fei Qin, Minghui Hong, Xiangang Luo, Roei Remez, Ady Arie, Jorg B. Gotte, Mark R. Dennis, Alex M. H. Wong, George Eleftheriades, Yaniv Eliezer, Alon Bahabad, Gang Chen, Zhongquan Wen, Gaofeng Liang, Chenglong Hao, C-W Qiu, Achim Kempf, Eytan Katzav, Moshe Schwartz
Article
Physics, Applied
Zhixiang Wu, Qi Zhang, Xue Jiang, Zhongquan Wen, Gaofeng Liang, Zhihai Zhang, Zhengguo Shang, Gang Chen
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2019)
Review
Optics
Gang Chen, Zhong-Quan Wen, Cheng-Wei Qiu
LIGHT-SCIENCE & APPLICATIONS
(2019)
Article
Optics
Huaixin Li, Qi Zhang, Xue Jiang, Gaofeng Liang, Zhongquan Wen, Zhihai Zhang, Zhengguo Shang, Gang Chen
Article
Physics, Applied
Fen Zhao, Xue Jiang, Sheng Li, Hao Chen, Gaofeng Liang, Zhongquan Wen, Zhihai Zhang, Gang Chen
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2019)
Article
Optics
Mengyu Yang, Desheng Ruan, Lianghui Du, Chunyan Qin, Zeyu Li, Cuiping Lin, Gang Chen, Zhongquan Wen
OPTICS COMMUNICATIONS
(2020)
Article
Materials Science, Multidisciplinary
Qi Zhang, Fengliang Dong, Huaixin Li, Zhengxu Wang, Gaofeng Liang, Zhihai Zhang, Zhongquan Wen, Zhengguo Shang, Gang Chen, Luru Dai, Weiguo Chu
ADVANCED OPTICAL MATERIALS
(2020)
Article
Nanoscience & Nanotechnology
Zhixiang Wu, Fengliang Dong, Shuo Zhang, Shaokui Yan, Gaofeng Liang, Zhihai Zhang, Zhongquan Wen, Gang Chen, Luru Dai, Weiguo Chu
Article
Optics
Qijian Jin, Gaofeng Liang, Gang Chen, Fen Zhao, Shaokui Yan, Kun Zhang, Mengyu Yang, Qi Zhang, Zhongquan Wen, Zhihai Zhang
Article
Optics
Zhixiang Wu, Hu Deng, Xiaoxia Li, Liang Xiong, Liping Shang, Gang Chen
OPTICAL ENGINEERING
(2020)
Article
Materials Science, Multidisciplinary
Fen Zhao, Ziping Li, Xuemei Dai, Xiaoyu Liao, Sheng Li, Juncheng Cao, Zhengguo Shang, Zhihai Zhang, Gaofeng Liang, Gang Chen, Hua Li, Zhongquan Wen
ADVANCED OPTICAL MATERIALS
(2020)
