Shunping Zhang 1,2,*Yuhao Xu 1Hongxing Xu 1,2,3,4,*
Author Affiliations
Abstract
1 School of Physics and Technology, and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Wuhan University, Wuhan, China
2 Wuhan Institute of Quantum Technology, Wuhan, China
3 School of Microelectronics, Wuhan University, Wuhan, China
4 Henan Academy of Sciences, Zhengzhou, China
Photonics Insights
2024, 3(1): C01
Author Affiliations
Abstract
1 Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of Chinahttps://ror.org/04qr3zq92, Chengdu 610054, China
2 Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
3 School of Physics and Technology, Center for Nanoscience and Nanotechnology, Wuhan University, Wuhan 430072, China
4 Department of Mechanical Engineering, University of North Texas, Denton, Texas 76207, USA
5 Department of Physics and Astronomy and Nanoscale and Quantum Phenomena Institute, Ohio University, Athens, Ohio 45701, USA
Circular dichroism (CD) is extensively used in various material systems for applications including biological detection, enantioselective catalysis, and chiral separation. This paper introduces a chiral absorptive metasurface that exhibits a circular polarization-selective effect in dual bands—positive and negative CD peaks at short wavelengths and long wavelengths, respectively. Significantly, we uncover that this phenomenon extends beyond the far-field optical response, as it is also observed in the photothermal effect and the dynamics of thermally induced fluid motion. By carefully engineering the metasurface design, we achieve two distinct CD signals with high g factors (1) at the wavelengths of 877 nm and 1045 nm, respectively. The findings presented in this study advance our comprehension of CD and offer promising prospects for enhancing chiral light–matter interactions in the domains of nanophotonics and optofluidics.
Photonics Research
2024, 12(2): 331
Author Affiliations
Abstract
1 East China Normal University, School of Physics and Electronic Science, State Key Laboratory of Precision Spectroscopy, Shanghai, China
2 Chinese Academy of Sciences, Shanghai Institute of Optics and Fine Mechanics, Key Laboratory of Materials for High-Power Laser, Shanghai, China
3 Shanghai University, Department of Physics, Shanghai, China
4 Wuhan University, School of Physics and Technology, Center for Nanoscience and Nanotechnology, Wuhan, China
5 University of Chinese Academy of Sciences, Hangzhou Institute for Advanced Study, Hangzhou, China
6 Chongqing Institute of East China Normal University, Chongqing Key Laboratory of Precision Optics, Chongqing, China
The collective response of macroscopic quantum states under perturbation is widely used to study quantum correlations and cooperative properties, such as defect-induced quantum vortices in Bose–Einstein condensates and the non-destructive scattering of impurities in superfluids. Superfluorescence (SF), as a collective effect rooted in dipole–dipole cooperation through virtual photon exchange, leads to the macroscopic dipole moment (MDM) in high-density dipole ensembles. However, the perturbation response of the MDM in SF systems remains unknown. Echo-like behavior is observed in a cooperative exciton ensemble under a controllable perturbation, corresponding to an initial collapse followed by a revival of the MDM. Such a dynamic response could refer to a phase transition between the macroscopic coherence regime and the incoherent classical state on a time scale of 10 ps. The echo-like behavior is absent above 100 K due to the instability of MDM in a strongly dephased exciton ensemble. Experimentally, the MDM response to perturbations is shown to be controlled by the amplitude and injection time of the perturbations.
superfluorescence polariton photoluminescence exciton 
Advanced Photonics
2023, 5(5): 055001
Author Affiliations
Abstract
1 State Key Laboratory of Precision Spectroscopy, School of Physics and Electronic Science, East China Normal University, Shanghai 200062, China
2 Huawei Technologies Co, Ltd., Bantian Longgang District, Shenzhen 518129, China
3 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
This paper reports the fabrication of regular large-area laser-induced periodic surface structures (LIPSSs) in indium tin oxide (ITO) films via femtosecond laser direct writing focused by a cylindrical lens. The regular LIPSSs exhibited good properties as nanowires, with a resistivity almost equal to that of the initial ITO film. By changing the laser fluence, the nanowire resistances could be tuned from 15 to 73 kΩ/mm with a consistency of ±10%. Furthermore, the average transmittance of the ITO films with regular LIPSSs in the range of 1200–2000 nm was improved from 21% to 60%. The regular LIPSS is promising for transparent electrodes of nano-optoelectronic devices—particularly in the near-infrared band.
transparent nanowires periodic surface nanostructures femtosecond laser direct writing ITO film anisotropic electrical conductivity 
Opto-Electronic Science
2023, 2(1): 220002
作者单位
摘要
1 School of Physics and Technology, Wuhan University, Wuhan 430072, Hubei , China
2 State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
3 The Institute of Technological Sciences, Wuhan University, Wuhan 430072, Hubei , China
Gallium nitride (GaN) has widespread applications in the semiconductor industry because of its desirable optoelectronic properties. The fabrication of surface structures on GaN thin films can effectively modify their optical and electrical properties, providing additional degrees of freedom for controlling GaN-based devices. Compared with lithography-based techniques, laser processing is maskless and much more efficient. This paper shows how surface micro-nano structures can be produced on GaN thin films using 355 nm nanosecond laser irradiation. The effects of the laser pulse energy, number of pulses, and polarization direction were studied. It was found that distinct micro-nano structures were formed under different irradiation conditions, and their geometries and elemental compositions were analyzed. The results indicate that different types of surface micro-nano structures can be produced on GaN thin films in a controllable manner using 355 nm nanosecond laser irradiation. The results of our study provide valuable guidance for the surface modification of GaN-based optoelectronic devices.Gallium nitride (GaN) has widespread applications in the semiconductor industry because of its desirable optoelectronic properties. The fabrication of surface structures on GaN thin films can effectively modify their optical and electrical properties, providing additional degrees of freedom for controlling GaN-based devices. Compared with lithography-based techniques, laser processing is maskless and much more efficient. This paper shows how surface micro-nano structures can be produced on GaN thin films using 355 nm nanosecond laser irradiation. The effects of the laser pulse energy, number of pulses, and polarization direction were studied. It was found that distinct micro-nano structures were formed under different irradiation conditions, and their geometries and elemental compositions were analyzed. The results indicate that different types of surface micro-nano structures can be produced on GaN thin films in a controllable manner using 355 nm nanosecond laser irradiation. The results of our study provide valuable guidance for the surface modification of GaN-based optoelectronic devices.
gallium nitride thin films nanosecond laser micro-nano structures laser-induced periodic surface structures 
激光与光电子学进展
2023, 60(7): 0714005
管志强 1,2,3,4,*代伟 2陈修平 2徐红星 2,3,4
作者单位
摘要
1 湖北江城实验室,湖北 武汉 430205
2 武汉大学物理科学与技术学院,湖北 武汉 430072
3 武汉大学微电子学院,湖北 武汉 430072
4 武汉大纳米科学与技术研究中心,人工微结构教育部重点实验室,湖北 武汉 430072
光热电效应是近年来涌现的一种新型的光电探测机制,具有可零偏压工作、宽谱响应、不受带隙限制的优点,在红外和太赫兹波段具有广阔的应用前景。随着纳米材料中热载流子的高效利用以及对室温长波探测需求的增加,光热电效应研究近年来发展迅速,涌现出一系列新材料和新型器件设计方法。在近年来已发表的光热电效应综述文章的基础上,本文重点对光热电效应的机理、仿真、材料相关参数测量方法、器件设计,以及探测性能近三年的进展进行了梳理和总结,希望能给相关领域的研究人员提供有益参考。
探测器 光热电效应 热载流子 塞贝克效应 多物理场模型 detectors photothermoelectric effect hot carriers Seebeck effect multiphysics modeling 
中国激光
2023, 50(1): 0113004
作者单位
摘要
中国激光
2023, 50(1): 0100000
Author Affiliations
Abstract
The human visual system, dependent on retinal cells, can be regarded as a complex combination of optical system and nervous system. Artificial retinal system could mimic the sensing and processing function of human eyes. Optically stimulated synaptic devices could serve as the building blocks for artificial retinas and subsequent information transmission system to brain. Herein, photonic synaptic transistors based on polycrystalline MoS2, which could simulate human visual perception and brain storage, are presented. Moreover, the photodetection range from visible light to near-infrared light of MoS2 multilayer could extend human eyes’ vision limitation to near-infrared light. Additionally, the photonic synaptic transistor shows an ultrafast speed within 5 μs and ultralow power consumption under optical stimuli about 40 aJ, several orders of magnitude lower than biological synapses (50 ms and 10 fJ). Furthermore, the backgate control could act as emotional modulation of the artificial brain to enhance or suppress memory function, i.e. the intensity of photoresponse. The proposed carrier trapping/detrapping as the main working mechanism is presented for the device. In addition, synaptic functionalities including short synaptic plasticity, long synaptic plasticity and paired-pulse facilitation could be successfully simulated based on the prepared device. Furthermore, the large difference between short synaptic plasticity and long synaptic plasticity reveals the better image pre-processing function of the prepared photonic synapses. The classical Pavlovian conditioning associated with the associative learning is successfully implemented as well. Therefore, the efficient and rich functionalities demonstrate the potential of the MoS2 synaptic device that integrates sensing-memory-preprocessing capabilities for realizing artificial neural networks with different emotions that mimic human retina and brain.The human visual system, dependent on retinal cells, can be regarded as a complex combination of optical system and nervous system. Artificial retinal system could mimic the sensing and processing function of human eyes. Optically stimulated synaptic devices could serve as the building blocks for artificial retinas and subsequent information transmission system to brain. Herein, photonic synaptic transistors based on polycrystalline MoS2, which could simulate human visual perception and brain storage, are presented. Moreover, the photodetection range from visible light to near-infrared light of MoS2 multilayer could extend human eyes’ vision limitation to near-infrared light. Additionally, the photonic synaptic transistor shows an ultrafast speed within 5 μs and ultralow power consumption under optical stimuli about 40 aJ, several orders of magnitude lower than biological synapses (50 ms and 10 fJ). Furthermore, the backgate control could act as emotional modulation of the artificial brain to enhance or suppress memory function, i.e. the intensity of photoresponse. The proposed carrier trapping/detrapping as the main working mechanism is presented for the device. In addition, synaptic functionalities including short synaptic plasticity, long synaptic plasticity and paired-pulse facilitation could be successfully simulated based on the prepared device. Furthermore, the large difference between short synaptic plasticity and long synaptic plasticity reveals the better image pre-processing function of the prepared photonic synapses. The classical Pavlovian conditioning associated with the associative learning is successfully implemented as well. Therefore, the efficient and rich functionalities demonstrate the potential of the MoS2 synaptic device that integrates sensing-memory-preprocessing capabilities for realizing artificial neural networks with different emotions that mimic human retina and brain.
MoS2 synaptic transistors visual perception ultralow power consumption memory 
Opto-Electronic Advances
2022, 5(9): 210069
Author Affiliations
Abstract
1 College of Optoelectronic Technology, Chengdu University of Information Technologyhttps://ror.org/01yxwrh59, Chengdu 610225, China
2 Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China
3 Department of Physics and Astronomy and Nanoscale and Quantum Phenomena Institute, Ohio University, Athens, Ohio 45701, USA
4 School of Physics and Technology, Center for Nanoscience and Nanotechnology, Wuhan University, Wuhan 430072, China
5 CINBIO, Universidade de Vigo, Vigo 36310, Spain
6 e-mail: ypeng@cuit.edu.cn
7 e-mail: zhmwang@uestc.edu.cn
Broadband absorbers generally consist of plasmonic cavities coupled to metallic resonators separated by a dielectric film, and they are vertically stacking configurations. In this work, we propose an ultra-broadband nanowire metamaterial absorber composed of an array of vertically aligned dielectric nanowires with coaxial metallic rings. The absorber shows strong absorption from 0.2 to 7 μm with an average absorption larger than 91% due to the excitation of gap surface plasmon polariton modes in Fabry–Perot-like resonators. Moreover, a refractory dielectric cladding can be added to improve the thermal stability of the absorber, showing a negligible impact on its absorption performance. The proposed absorber may find potential applications in solar energy harvesting, infrared imaging and spectroscopy, and optoelectronic devices.
Photonics Research
2022, 10(12): 2718
Author Affiliations
Abstract
1 Shandong Provincial Engineering and Technical Center of Light Manipulations & Shandong Provincial Key Laboratory of Optics and Photonic Device, School of Physics and Electronics, Shandong Normal Universityhttps://ror.org/01wy3h363, Jinan 250014, China
2 School of Physics and Technology, Center for Nanoscience and Nanotechnology, and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Wuhan University, Wuhan 430072, China
3 College of Electronics and Information Engineering, Shenzhen University, Shenzhen 518060, China
4 e-mail: jjshi@sdnu.edu.cn
5 e-mail: hexb@sdnu.edu.cn
Realization of the efficient steering for photons streams from nano sources is essential for further progress in integrated photonic circuits, especially when involving nonlinear sources. In general, steering for nonlinear sources needs additional optical control elements, limiting their application occasions as photonic devices. Here, we propose a simple and efficient beam steering scheme for the second-harmonic (SH) emission in the hybrid waveguide (consisting of CdSe nanobelts on the Au film) by mode-selective excitation. Adjusting the position of the incident beam illuminating on the tapered waveguide, the excitation types of guided modes can be selected, realizing the directionality control of SH emission. Stable steering of 6.1° for the SH emission is observed when the interference modes change from TE00 & TE01 to TE00 & TE02, which is confirmed by SH Fourier imaging and simulations. Our approach gets rid of the complex structural design and provides a new idea for beam steering of nonlinear optical devices with various nonlinear wavefronts.
Photonics Research
2022, 10(12): 2708

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