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Characterization and Saturable Absorption Property of Graphene Oxide on optical Fiber by optical Deposition

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Journal of Wuhan University of technology(Materials Science) 2017年第4期32卷 882-887页

作者：丁莉芸 XU Chuang XU Bing HUANG Jun National Engineering laboratory for Fiber Optic Sensing technology Wuhan University of Technology Wuhan 430070 China key laboratory of Fiber Optic Sensing technology and information processing Ministy of Education Wuhan University of Technology Wuhan 430070 China

We prepared graphene oxide（GO） saturable absorber（SA） successfully through optical deposition method, which is a simple but effective approach to deposit various materials onto substrate under the effects of light, and investigated several factors that influence the optical deposition result of GO onto optical fiber end, including poly（methyl methacrylate）（PMMA） concentration, light intensity, light mode, and deposition time. The efficient optically deposited GO preserving its nonlinearity guaranteed by GO/PMMA composite formation was also demonstrated. The GO SA prepared by optical deposition shows superior saturable absorption property with modulation depth and nonsaturable loss of 6% and 40%, respectively.

关键词： optical deposition graphene oxide saturable absorption optical fiber

Research on the Construction of a Novel Cyberspace Security Ecosystem

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Engineering 2018年第1期4卷 47-52页

作者： Xiao-Niu Yang Wei Wang Xiao-Feng Xu Guo-Rong Pang Chun-Lei Zhang Science and technology on Communication information Security Control laboratory Jiaxing Zhejiang 314033 China Science and technology on Electro-optical information Security Control laboratory Tianfin 300300 China

Given the challenges facing the cyberspace of the nation, this paper presents the tripartite theory of cyberspace, based on the status quo of cyberspace. Corresponding strategies and a research architecture are proposed for common public networks （C space）, secure classified networks （S space）, and key infras- tructure networks （K space）, based on their individual characteristics. The features and security require- ments of these networks are then discussed. Taking C space as an example, we introduce the SMCRC （which stands for ＂situation awareness, monitoring and management, cooperative defense, response and recovery, and countermeasures and traceback＂） loop for constructing a cyberspace security ecosys- tem. Following a discussion on its characteristics and information exchange, our analysis focuses on the critical technologies of the SMCRC loop. To obtain more insight into national cyberspace security, special attention should be paid to global sensing and precise mapping, continuous detection and active manage- ment, cross-domain cooperation and systematic defense, autonomous response and rapid processing, and accurate traceback and countermeasure deterrence.

关键词： Cyberspace security ecosystem SMCRC loop Tripartite theory of cyberspace

Raman spectroscopy characterization of two-dimensional materials

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Chinese Physics B 2018年第3期27卷 80-93页

作者： Fang Liang Hejun Xu Xing Wu Chaolun Wang Chen Luo Jian Zhang Shanghai key laboratory of Multidimensional information processing Department of Electronic Engineering East China Normal University Shanghai 200241 China

Two-dimensional （2D） materials have become a hot study topic in recent years due to their outstanding electronic, optical, and thermal properties. The unique band structures of strong in-plane chemical bonds and weak out-of-plane van der Waals （vdW） interactions make 2D materials promising for nanodevices and various other applications. Raman spectroscopy is a powerful and non-destructive characterization tool to study the properties of 2D materials. In this work, we review the research on the characterization of 2D materials with Raman spectroscopy. In addition, we discuss the application of the Raman spectroscopy technique to semiconductors, superconductivity, photoelectricity, and thermoelectricity.

关键词： Raman MoS2 graphene 2D materials non-destructive characterization

Dynamic polarization rotation and vector field steering based on phase change metasurface

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Frontiers of physics 2023年第1期18卷 193-199页

作者： Hairong He Hui Yang Zhenwei Xie Xiaocong Yuan Nanophotonics Research Center Shenzhen Key Laboratory of Micro-scale Optical Information TechnologyInstitute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China

Polarization rotation and vector field steering of electromagnetic wave are of great significance in modern optical ***,conventional polarization devices are bulky,monofunctional and lack of tunability,which pose great challenges to the miniaturized and multifunctional ***,we propose a meta-device that is capable of multi-state polarization rotation and vector field steering based on phase change *** supercell of the meta-device consists of four Ge2Sb2Te5(GST)elliptic cylinders located on a SiO2 *** independently controlling the phase state(amorphous or crystalline)of each GST elliptic cylinder,the meta-device can rotate the polarization plane of the linearly polarized incident light to different angles that cover from 19.8°to 154.9°at a wavelength of 1550 ***,by merely altering the phase transition state of GST elliptic cylinders,we successfully demonstrated a vector field steering by generating optical vortices carrying orbital angular momentums(OAMs)with topological charges of 0,1 and–1,*** proposed method provides a new platform for investigating dynamically tunable optical devices and has potential applications in many fields such as optical communications and information processing.

关键词： polarization rotation vector field steering phase change metasurface

A full-duplex optical access system with hybrid 64/16/4QAM-OFDM downlink

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Optoelectronics Letters 2016年第5期12卷 361-365页

作者：贺超谭泽富邵宇丰蔡黎蒲鹤升朱云乐黄思斯刘毓 key laboratory of Signal and information processing College of Electronic & Information EngineeringChongqing Three Gorges University

A full-duplex optical passive access scheme is proposed and verified by simulation, in which hybrid 64/16/4-quadrature amplitude modulation(64/16/4QAM) orthogonal frequency division multiplexing(OFDM) optical signal is for downstream transmission and non-return-to-zero(NRZ) optical signal is for upstream transmission. In view of the transmitting and receiving process for downlink optical signal, in-phase/quadrature-phase(I/Q) modulation based on Mach-Zehnder modulator(MZM) and homodyne coherent detection technology are employed, respectively. The simulation results show that the bit error ratio(BER) less than hardware decision forward error correction(HD-FEC) threshold is successfully obtained over transmission path with 20-km-long standard single mode fiber(SSMF) for hybrid downlink modulation OFDM optical signal. In addition, by dividing the system bandwidth into several subchannels consisting of some continuous subcarriers, it is convenient for users to select different channels depending on requirements of communication.

关键词： downlink duplex multiplexing quadrature transmitting modulator bandwidth correction transmitter hardware

Effect of Zeroth-Order beam on Azobenzene Polymer Surface Relief Gratings Fabricated by Phase-Mask Method

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Chinese Physics Letters 2010年第9期27卷 90-93页

作者：武文轩罗艳华程旭升田秀杰邱薇薇任希锋朱冰张其锦 key laboratory of SoYt Matter Chemistry Department of Polymer Science and Engineering University o[ Science and Technology of China Hefei 230026 Department of Electronic Engineering and information Science University of Science and Technology of China Hefei 230026 key laboratory of Quantum information Department of Optics and Optical Engineering University of Science and Technology of China Hefei 230026 Anhui key laboratory of Optoelectronic Science and technology University of Science and Technology of China Hefei 230026

In the fabrication of surface relief gratings （SRGs） on azobenzene polymer films with a zeroth-order suppressed diffraction phase mask, it is found that the SRGs＇ relief figure and period change with the irradiation time, and the period is doubled after a critical time. The time dependence of the changes in the SRG forming process is investigated by theoretical analysis and experiments. An optimum time range for inscription of the sub-micron SInGs is determined to be 5-8 rain in terms of both the theoretical and experimental results.

关键词： processing Experimentation Periodicity Timing Time

Protecting Distribution Entanglement by Weak Measurement and Reversal under Various Decoherence Sources

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Communications in Theoretical Physics 2014年第4期61卷 464-468页

作者：王琼姚春梅 Hunan Province key laboratory of Photoelectric information Integration optical Manufacturing technology Department of Physics and Electronic ScienceHunan University of Arts and Science

Protection of entanglement from disturbance of the environment is an essential task marion processing. We examine the validity and limitation of the weak measurement and reversal in quantum infor- （WMR） operation in the protection of distributed entanglement from various decoherence sources. Since the entanglement variation can be investigated analytically for an arbitrarily entangled bipartite pure state under three kinds of typical noisy quantum channels, we show explicitly that the WMR operation indeed helps for protecting distributed entanglement from ampli- tude damping and phase damping, but not for depolarizing. Bxperimental feasibility for testing our results is discussed using current laboratory techniques.

关键词： weak measurement and reversal quantum entanglement decoherence

NiPS_(3)quantum sheets modified nitrogen-doped mesoporous carbon with boosted bifunctional oxygen electrocatalytic performance

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Journal of Materials Science & technology 2021年第6期65卷 1-6页

作者： Kai Huang Yuyang Xu Yanpeng Song Ruyue Wanga Hehe Wei Yuanzheng Long Ming Lei Haolin Tang Jiangang Guo Hui Wu State key laboratory of information Photonics and optical Communications School of Science.Beijing University of Posts and Telecommunications Beijing 100876China Beijing National laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences.Beijing 100190China University of Chinese Academy of Sciences Beijing 100049China State key laboratory of New Ceramics and Fine processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China State key laboratory of Advanced technology for Materials Synthesis and processing Wuhan University of TechnologyWuhan 430070China

Electrocatalysts for oxygen reduction reactions(ORR)and oxygen evolution reactions(OER)are highly crucial and challenging toward the energy storage and conversion technologies such as fuel cells,metal-air batteries and water *** replace noble-metal based catalysts and boost catalytic performance of carbon-based materials,we initially develop the nickel,phospho rus,sulfur and nitrogen co-modified mesoporous carbon(NiPS_(3)@NMC)as a bifunctional oxygen *** perfo rmance for ORR(half-wave potential at 0.90 V)and OER(10 mA cm^(-2)at 1.48 V)surpasses those of Pt/C coupled with IrO_(2)catalysts and most of the non-precious metal based bifunctional electrocatalysts reported in related ***,the electrochemical durability is also confirmed by accelerated durability tests(ADTs)and long-term chronoamperometry(CA)*** demonstrated that the interfacial effect between NiPS_(3)quantum sheets(QS s)and NMC substrates by thermal activation contributed to the enhanced oxygen electrode bifunctionality with more active sites,due to the electrons-donating from nickel,phosphorus and sulfur elements and relatively enriched pyridinic type *** excellent overall performance highlights the potential application of NiPS3 QSs and NMC composites as the materials on energy conversion and storage.

关键词： NiPS_(3)quantum sheets N-doped mesoporous carbon Bifunctional oxygen electrocatalysts Liquid exfoliation Thermal annealing

Magnetic plasmon resonances in nanostructured topological insulators for strongly enhanced light-MoS_(2) interactions

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Light(Science & Applications) 2020年第1期9卷 155-164页

作者： Hua Lu Zengji Yue Yangwu Li Yinan Zhang Mingwen Zhang Wei Zeng Xuetao Gan Dong Mao Fajun Xiao Ting Mei Weiyao Zhao Xiaolin Wang Min Gu Jianlin Zhao MOE key laboratory of Material Physics and Chemistry under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information TechnologySchool of Physical Science and TechnologyNorthwestern Polytechnical University710129 Xi’anChina Institute for Superconducting&Electronic Materials and ARC Centre of Excellence in Future Low-Energy Electronics University of WollongongNorth WollongongNSW 2500Australia Center for Artificial-Intelligence Nanophotonics School of Optical-Electrical and Computer EngineeringUniversity of Shanghai for Science and Technology200093 ShanghaiChina Guangdong Provincial key laboratory of optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan University510632 GuangzhouChina State key laboratory of Solidification processing School of Materials Science and EngineeringNorthwestern Polytechnical University710072 Xi’anChina

Magnetic resonances not only play crucial roles in artificial magnetic materials but also offer a promising way for light control and interaction with ***,magnetic resonance effects have attracted special attention in plasmonic systems for overcoming magnetic response saturation at high frequencies and realizing high-performance optical *** novel states of matter,topological insulators(TIs)present topologically protected conducting surfaces and insulating bulks in a broad optical range,providing new building blocks for ***,until now,high-frequency(*** range)magnetic resonances and related applications have not been demonstrated in TI ***,we report for the first time,to our knowledge,a kind of visible range magnetic plasmon resonances(MPRs)in TI structures composed of nanofabricated Sb_(2)Te_(3) *** experimental results show that the MPR response can be tailored by adjusting the nanogroove height,width,and pitch,which agrees well with the simulations and theoretical ***,we innovatively integrated monolayer MoS_(2) onto a TI nanostructure and observed strongly reinforced light-MoS_(2) interactions induced by a significant MPR-induced electric field enhancement,remarkable compared with TI-based electric plasmon resonances(EPRs).The MoS_(2) photoluminescence can be flexibly tuned by controlling the incident light *** results enrich TI optical physics and applications in highly efficient optical functionalities as well as artificial magnetic materials at high frequencies.

关键词： topological resonance visible