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Giant photonic spin Hall effect in momentum space in a structured metamaterial with spatially varying birefringence

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Light(Science & Applications) 2015年第1期4卷 354-359页

作者： Xiaohui Ling Xinxing Zhou Xunong Yi weixing shu Yachao Liu Shizhen Chen Hailu Luo shuangchun Wen Dianyuan Fan Laboratory for Spin Photonics School of Physics and ElectronicsHunan UniversityChangsha 410082China Department of Physics and Electronic Information Science Hengyang Normal UniversityHengyang 421002China SZU-NUS Collaborative Innovation Center for Optoelectronic Science&Technology and Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceShenzhen UniversityShenzhen 518060China

The photonic spin Hall effect(SHE)in the reflection and refraction at an interface is very weak because of the weak spin-orbit ***,we report the observation of a giant photonic SHE in a dielectric-based *** metamaterial is structured to create a coordinate-dependent,geometric Pancharatnam–Berry phase that results in an SHE with a spin-dependent splitting in momentum *** is unlike the SHE that occurs in real space in the reflection and refraction at an interface,which results from the momentum-dependent gradient of the geometric Rytov–Vladimirskii–Berry *** theorize a unified description of the photonic SHE based on the two types of geometric phase gradient,and we experimentally measure the giant spin-dependent shift of the beam centroid produced by the metamaterial at a visible *** results suggest that the structured metamaterial offers a potential method of manipulating spin-polarized photons and the orbital angular momentum of light and thus enables applications in spin-controlled nanophotonics.

关键词： geometric phase metamaterial photonic spin Hall effect

Polarization evolution of vector beams generated by q-plates

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Photonics Research 2017年第2期5卷 64-72页

作者： weixing shu XIAOHUI LING XIQUAN FU YACHAO LIU YOUGANG KE HAILU LUO College of Computer Science and Electronic Engineering Hunan University Laboratory for Spin Photonics School of Physics and Electronics Hunan University College of Physics and Electronic Engineering Hengyang Normal University

The polarization evolution of vector beams(VBs) generated by q-plates is investigated theoretically and *** analytical model is developed for the VB created by a general quarter-wave q-plate based on vector diffraction *** is found that the polarization distribution of VBs varies with position and the value *** particular,for the incidence of circular polarization,the exit vector vortex beam has polarization states that cover the whole surface of the Poincarésphere,thereby constituting a full Poincaré*** the incidence of linear polarization,the VB is not cylindrical but specularly symmetric,and exhibits an azimuthal spin *** results are in sharp contrast with those derived by the commonly used model,i.e.,regarding the incident light as a plane *** implementing q-plates with dielectric metasurfaces,further experiments validate the theoretical results.

关键词： Polarization evolution of vector beams generated by q-plates

APPLICATION OF TRIANGLE MARKOV CHAIN TO GRAVITY CONCENTRATION

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Acta Metallurgica Sinica(English Letters) 1990年第8期3卷 81-90页

作者： WANG weixing HUANG shu CHEN Jin Central South University of Technology,Changsha,China WANG weixing,Department of Mineral Engineering,Central South University of Technology,Changsha,Hunan 410083,China

In combination with the Bagnold's shearing theory and the principle of Markov process,a mathematical model of sluice type's gravity concentrators has been developed based on the transfer probabilities of mineral *** to the transfer probabilities,the quanti- tative relationship between the final separation results and feed variables has been established and verified by experimental *** availability of this model is vital for process design and optimization or mill control of gravity concentration circuits.

关键词： gravity concentration mineral processing stochastic process Markov process sediment transport

Photonic spin Hall effect on the surface of anisotropic two-dimensional atomic crystals

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Photonics Research 2018年第6期6卷 511-516页

作者： WENshuAI ZHANG WEIJIE WU SHIZHEN CHEN JIN ZHANG XIAOHUI LING weixing shu HAILU LUO shuANGCHUN WEN Laboratory for Spin Photonics School of Physics and ElectronicsHunan University Key Laboratory for Micro-/Nano-Optoelectronic Devices of Ministry of Education School of Physics and ElectronicsHunan University

We examine the spin-orbit interaction of light and photonic spin Hall effect on the surface of anisotropic two- dimensional atomic crystals. As an example, the photonic spin Hall effect on the surface of black phosphorus is investigated. The photonic spin Hall effect manifests itseff as the spin-dependent beam shifts in both transverse and in-plane directions. We demonstrate that the spin-dependent shifts are sensitive to the orientation of the optical axis, doping concentration, and interband transitions. These results can be extensively extended to other anisotropic two-dimensional atomic crystals. By incorporating the quantum weak measurement techniques, the photonic spin Hall effect holds great promise for detecting the parameters of anisotropic two-dimensional atomic crystals.

关键词： Polarization Electromagnetic optics

基于Metasurface的轨道角动量光束的产生与调控

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光学学报 2015年第8期35卷 326-332页

作者：贺时梅舒维星湖南大学信息科学与工程学院微纳光电器件及应用教育部重点实验室湖南长沙410082

提出了一种基于metasurface产生与调控轨道角动量光束的新方法。光场在偏振态的演变过程中可以获得附加的Pancharatnam-Berry(PB)几何相位。因此,可以通过调控光场的偏振态获得所需相位。所构造的metasurface具有空间变化的光轴分布,能... 详细信息

提出了一种基于metasurface产生与调控轨道角动量光束的新方法。光场在偏振态的演变过程中可以获得附加的Pancharatnam-Berry(PB)几何相位。因此,可以通过调控光场的偏振态获得所需相位。所构造的metasurface具有空间变化的光轴分布,能够精确地操控光束的偏振态。当metasurface的光轴方向在方位角方向连续变化时,就能产生与方位角坐标相关的PB相,也就是涡旋相。该相位可以用来产生轨道角动量光束,也可以用来操控涡旋光束的轨道角动量。实验结果验证了这种方案的可行性。所得到的结果为轨道角动量光束的产生及光束的轨道角动量调控提供了一种新方法,对基于轨道角动量光束的量子通信和光学微操控等也有应用价值。

关键词：物理光学轨道角动量涡旋光束 metasurface Pancharatnam-Berry几何相

复变函数与积分变换教学的优化设计——以卷积为例

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河南教育学院学报（自然科学版） 2023年第3期32卷 23-26页

作者：舒维星陈钦俊湖南大学物理与微电子科学学院湖南长沙410082

以抽象难学的卷积为例,设计了复变函数与积分变换的典型教学过程,提出优化教学的信息化方法。主要优化包括化解教学难点,教学内容紧密联系现代信息科技应用,学生运用信息化工具打牢基础,探索科技前沿问题。多年实践证实,信息化能显著提... 详细信息

以抽象难学的卷积为例,设计了复变函数与积分变换的典型教学过程,提出优化教学的信息化方法。主要优化包括化解教学难点,教学内容紧密联系现代信息科技应用,学生运用信息化工具打牢基础,探索科技前沿问题。多年实践证实,信息化能显著提升教学效果,培养学生的创新能力。

关键词：复变函数积分变换信息化卷积优化教学设计

Hybrid interference alignment and power allocation for multi-user interference MIMO channels

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Science China(Information Sciences) 2013年第4期56卷 19-27页

作者： shu Feng YOU XiaoHu WANG Mao HAN YuBing LI Yang SHENG weixing Institute of Wireless Communication and Sensor Network EEOTNanjing University of Science and Technology National Mobile Communications Research Laboratory Southeast University Department of Electrical Engineering University of Texas at DallasTX 75080-3021TexasUSA

This paper proposes a hybrid interference alignment scheme which combines maximizing signal-toleakage-noise ratio(Max-SLNR) at transmitter and maximizing signal-to-interference-noise ratio(Max-SINR) at *** proposed scheme gives the same sum rate as the existing method using Max-SINR at both transmitter and receiver by avoiding the operation of reversing channel,thus it provides a simpler ***,two power allocation procedures are devised based on game theory and water *** gain of these schemes over equal power allocation increases to 2 bit/s/Hz in correlated fading channels as large-scale fading becomes ***,user fairness is solved by introducing weighting factors.

关键词： interference alignment power allocation sum rate Max-SLNR Max-SINR

Research on Electromagnetic Compatibility of Chinese High Speed Railway System

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Chinese Journal of Electronics 2020年第1期29卷 16-21页

作者： WEN Yinghong HOU weixing Beijing Jiaotong University National Railway Administration of the People's Republic of China

From technology importation to independent innovation, Chinese High speed railway(HSR)has been rapidly developed in the past a few ***, this technology development mode introduces very complex electromagnetic environment of HSR system,which is based on various equipment with different Electromagnetic compatibility(EMC) design. Consequently,the suppression of electromagnetic disturbance and the electromagnetic protection is becoming an urgent issue for HSR. The characteristics of traction power supply technology, train operation control technology and other core technologies are quite unique in Chinese HSR. In this paper, the EMC and the electromagnetic safety issue of Chinese HSR is discussed, which is derived from technology development mode and core technology characteristics. The limitation of the high speed train’s exportation due to the lack of test method for the train’s emission is also analyzed. Combining the electromagnetic environment characteristic and the development planning of Chinese HSR, several suggestions in the research of antielectromagnetic interference, electromagnetic protection in the strong electromagnetic field and the whole large system’s radiation emission test method are put forward.

关键词： High speed railway Electromagnetic compatibility Electromagnetic environment

New understanding achieved from 2 years of Chinese ionospheric investigations

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Science Bulletin 2016年第7期61卷 524-542页

作者： Libo Liu weixing Wan Key Laboratory of Earth and Planetary Physics Institute of Geology and Geophysics Chinese Academy of Sciences Beijing National Observatory of Space Environment Institute of Geology and Geophysics Chinese Academy of Sciences Geoscience School University of the Chinese Academy of Sciences

In the mainland of China, the number of ionospheric research groups is more than 10. Around 110 articles related to ionospheric physics have been published during 2014–2015. In this annual national report of the Committee on Space Research(COSPAR), we will outline some recent progresses in ionospheric studies conducted by the Chinese mainland scientists in the past 2 years. These investigations cover(1) the ionosphere responses to geomagnetic activities;(2) ionospheric climatology and structures;(3) couplings between the ionosphere, plasmasphere and lower atmosphere, and possible seismic signatures in the ionosphere;(4) ionospheric irregularities and scintillation;(5) ionospheric models, data assimilation and simulations;(6) ionospheric dynamics and electrodynamics;(7) progresses in the observation methodology and technique; and(8) planetary ionospheres. Such investigations will strengthen our ability to monitor the ionosphere,provide a better understanding of the ionospheric states and the underlying fundamental processes, and improve the ionospheric modeling, forecasting, and related applications.

关键词： Ionosphere Ionospheric climatology Ionospheric dynamics Ionospheric coupling Planetary ionospheres Ionospheric disturbance