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Effects of hydrostatic pressure and temperature on the nonlinear optical properties of semiparabolic plus semi-inverse squared quantum wells

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Communications in Theoretical Physics 2021年第8期73卷 139-145页

作者： guo-Liang Xu Zi Zhen Yi-Sheng Shi kang-xian guo E Feddi Jian-Hui Yuan Zhi-Hai Zhang School of Physics and Electronics Yancheng Teachers UniversityYancheng 224002China Department of Physics College of Physics and Electronic EngineeringGuangzhou UniversityGuangzhou 510006China Laboratoire de la matiere condensee et Sciences Interdisciplinaires(LAMCScI) Group of Optoelectronic of Semiconductors and NanomaterialsENSETMohammed V University in RabatMorocco Laboratory of Biomedical Photonics and Engineering Guangxi Medical UniversityNanning 530021China

In this study,the effects of hydrostatic pressure and temperature on nonlinear optical rectification(OR),second-harmonic generation(SHG),third-harmonic generation(THG)and the linear,nonlinear,and total optical absorption coefficients(OACs)of a semiparabolic plus semi-inverse squared quantum well(QW)are theoretically *** results show that hydrostatic pressure and temperature have significant effects on the optical properties of semiparabolic plus semi-inverse squared QWs,and that the energy levels and magnitudes of the resonant peaks of OR,SHG,THG,and the total OACs vary according to the shape of the limiting potential,the hydrostatic pressure,and the *** is easily seen that the peak positions of the resonant peaks of OR,SHG,THG,and the total OACs in the semiparabolic plus semi-inverse squared QW show a red shift with increasing hydrostatic pressure,but a blue shift with increasing ***,the magnitude and position of the resonant peaks of OR,SHG,THG,and the total OACs can be adjusted by changing the hydrostatic pressure and the temperature,which promise a new degree of freedom in the tunability of various electro-optical devices.

关键词： Quantum well Optical properties Hydrostatic pressure Temperature

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Controllable four-wave mixing based on quantum dot-cavity coupling system

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Communications in Theoretical Physics 2021年第5期73卷 25-32页

作者： Hong-Wu Xing Bin Chen Li-Li Xing Jian-Bin Chen Hai-Bin Xue kang-xian guo Department of Physics College of Physics and OptoelectronicsTaiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi ProvinceTaiyuan 030024China Department of Physics School of Physics and Materials ScienceGuangzhou UniversityGuangzhou 510006China

We theoretically study the four-wave mixing(FWM)response in a quantum dot-cavity coupling system,where a two-level quantum dot(QD)is placed in an optical cavity while the cavity mode is coupled to the nanomechanical resonator via radiation *** influences of the QD-cavity coupling strength,the Rabi coupling strength of the QD,and the power of the pump light on the FWM intensity are mainly *** numerical results show that the FWM intensity in this hybrid system can be significantly enhanced by increasing the QD-cavity coupling *** addition,the FWM intensity can be effectively modulated by the Rabi coupling strength and the pump ***,the effects of the cavity decay rate and the cavitypump detuning on the FWM signal are also *** obtained results may have potential applications in the fields of quantum optics and quantum information science.

关键词： four-wave mixing quantum dot-cavity coupling system input-output relation

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Controllable four-wave mixing response in a dual-cavity hybrid optomechanical system

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Chinese Physics B 2021年第5期30卷 406-411页

作者： Lei Shang Bin Chen Li-Li Xing Jian-Bin Chen Hai-Bin Xue kang-xian guo Department of Physics College of Physics and OptoelectronicsTaiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi ProvinceTaiyuan 030024China Department of Physics School of Physics and Material ScienceGuangzhou UniversityGuangzhou 510006China

We systematically investigate the four-wave mixing(FWM)spectrum in a dual-cavity hybrid optomechanical system,which is made up of one optical cavity with an ensemble of two-level atoms and another with a mechanical *** this work,we propose that the hybrid dual-cavity optomechanical system can be employed as a highly sensitive mass sensor due to the fact that the FWM spectrum generated in this system has a narrow spectral width and the intensity of the FWM can be easily tuned by controlling the coupling strength(cavity-cavity,atom-cavity).More fascinatingly,the dual-cavity hybrid optomechanical system can also be used as an all-optical switch in view of the easy on/off control of FWM signals by adjusting the atom-pump detuning to be positive or *** proposed schemes have great potential applications in quantum information processing and highly sensitive detection.

关键词： four-wave mixing dual-cavity optomechanical system atomic ensemble

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Generation of tripartite Einstein-Podolsky-Rosen steering by cascaded nonlinear process

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Chinese Physics B 2020年第5期29卷 74-79页

作者： Yu Liu Su-Ling Liang Guang-Ri Jin You-Bin Yu Jian-Yu Lan Xiao-Bin He kang-xian guo Key Laboratory of Optical Field Manipulation of Zhejiang Province Department of PhysicsZhejiang Sci-Tech UniversityHangzhou 310018China Shanghai Institute of Space Power Sources Shanghai Academy of Spaceflight TechnologyShanghai 200245China School of Physics and Electronic Engineering Guangzhou UniversityGuangzhou 510006China

A scheme is proposed to generate genuine tripartite Einstein-Podolsky-Rosen(EPR)steering in cascaded nonlinear process of the fourth-harmonic *** second-harmonic is generated by the first double-frequency process in an optical ***,the fourth-harmonic is produced by the second cascaded double-frequency process through quasi-phase-matching technique in the same optical *** genuine tripartite EPR steering among the pump,the second-harmonic,and the fourth-harmonic beams can be obtained by this cascaded nonlinear process according to a criterion for genuine multipartite quantum *** quantum steering properties are discussed by adjusting the parameters related to the cascaded nonlinear *** present research provides a reference scheme and data for obtaining good multipartite EPR steering in experiment and can advance the applications of quantum steering in the quantum information processing.

关键词： quantum steering harmonic generation quasi-phase-matching optical superlattice

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高频圆电流磁场中导体环所受电磁悬浮力的实验测量

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物理实验 2002年第10期22卷 9-11页

作者：云月厚邰显康李国栋张伟内蒙古大学物理系呼和浩特010021

利用扭秤的高灵敏度和稳定性测量了高频圆电流对导体的电磁悬浮力 .通过对与高频圆电流同轴细导体环距高频圆电流平面不同高度所受电磁悬浮力的测量 ,得到了导体环表面单位面积受纵向电磁悬浮力的分布 .与理论计算结果进行对比分析 ,结... 详细信息

利用扭秤的高灵敏度和稳定性测量了高频圆电流对导体的电磁悬浮力 .通过对与高频圆电流同轴细导体环距高频圆电流平面不同高度所受电磁悬浮力的测量 ,得到了导体环表面单位面积受纵向电磁悬浮力的分布 .与理论计算结果进行对比分析 ,结果表明 ,在导体环与圆电流平面距离较大时实验曲线与理论曲线相吻合 .从而为电磁悬浮实验提供了一种简便而准确的测量手段 .

关键词：高频圆电流磁场实验测量扭秤导体环电磁悬浮力

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富含稀土白云选铁尾矿制备的微波吸收材料特性研究

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稀土 2003年第2期24卷 68-70页

作者：云月厚邰显康李国栋刘文生内蒙古大学物理系内蒙古呼和浩特010021

以白云鄂博选铁尾矿为原料制备吸波材料,在7.6～11.5GHz对其吸收特性进行分析研究,实验结果表明,在富含铁及多种稀土元素的选铁尾矿中加入2%的磁性及电性介质,经过650℃热处理后,最大吸收量达21dB,13dB带宽2.4GHz。该尾矿用于制备吸波材... 详细信息

以白云鄂博选铁尾矿为原料制备吸波材料,在7.6～11.5GHz对其吸收特性进行分析研究,实验结果表明,在富含铁及多种稀土元素的选铁尾矿中加入2%的磁性及电性介质,经过650℃热处理后,最大吸收量达21dB,13dB带宽2.4GHz。该尾矿用于制备吸波材料,具有较大的研究意义。

关键词：选铁尾矿稀土吸波材料吸收量

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Polaronic Electron-Phonon Interactions on the Third-Harmonic Generation in a Square Quantum Well

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Communications in Theoretical Physics 2006年第1期45卷 171-174页

作者： LU Zhi-En guo kang-xian Department of Physics Faculty of Sciences Guihuagang Campus Guangzhou University Guangzhou 510405 China

The influence of electron-phonon interactions on third-harmonic generation in a square quantum well is investigated. The first- and third-harmonic generation coefficient is obtained by using compact-density-matrix approach and iterative method, and the numerical results are presented for a GaAs square quantum well. The results show that the third-harmonic generation coefficient is obviously enhanced after considering the influence of electron-phonon interactions.

关键词： electron-phonon interactions third-harmonic generation nonlinearity

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Modified Baer-Nunziato Model for the Simulation of Interfaces Between Compressible Fluids

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Communications in Computational Physics 2011年第4期9卷 1040-1055页

作者： Qiang Wu xian-guo Lu De-kang Mao Department of Mathematics Shanghai UniversityShanghai 200444China Accounting Institute Shanghai Institute of Foreign TradeWenxiang Road 1900SongjiangShanghaiChina Mathematics College Hefei University of TechnologyHefei 230009China

In this paper we proposed a modified Baer-Nunziato model for compressible multi-fluid flows,with main attention on the energy exchange between the two *** proposed model consists of eleven PDEs;however,the use of the particular phase evolving variables may reduce the model to have only six *** main advantage of the model is that the Abgrall’s UPV criterion on mixture velocity and pressure is satisfied without affecting either its hyperbolicity or its conservations of the two individual masses,momentum or total *** Lax-Friedrichs scheme is built for a particular case of the proposed *** the two fluids in the fluid mixture are both of the linear Mie-Gruneisen type,the scheme satisfies the Abgrall’s UPV criterion on mixture velocity and *** experiments with polytropic,barotropic,stiffened and van der Waals fluids show that the scheme is efficient and able to treat fluids characterized with quite different thermodynamics.

关键词： Baer-Nunziato model hyperbolicity Abgrall’s UPV criterion

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Searchable Encryption Cloud Storage with Dynamic Data Update to Support Efficient Policy Hiding

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China Communications 2020年第6期17卷 153-163页

作者： Laicheng Cao Yifan kang Qirui Wu Rong Wu xian guo Tao Feng School of Computer and Communication Lanzhou University of Technology

Ciphertext policy attribute based encryption(CP-ABE)can provide high finegrained access control for cloud ***,it needs to solve problems such as property privacy protection,ciphertext search and data update in the application ***,based on CP-ABE scheme,this paper proposes a dynamically updatable searchable encryption cloud storage(DUSECS)*** the characteristics of homomorphic encryption,the encrypted data is compared to achieve efficient hiding ***,adopting linked list structure,the DUSECS scheme realizes the dynamic data update and integrity detection,and the search encryption against keyword guessing attacks is achieved by combining homomorphic encryption with aggregation *** analysis of security and performance shows that the scheme is secure and efficient.

关键词： cloud storage dynamic update keywords search policy hidden

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Intelligent reflecting surfaces-assisted millimeter wave communication:Channel estimation based on deep learning

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The Journal of China Universities of Posts and Telecommunications 2024年第1期31卷 49-56页

作者： kang Xiaofei Wang Tian Liang xian College of Communication and Information Engineering Xi'an University of Science and TechnologyXi'an 710600China

In response to the challenge posed by the complexity of the system and the difficulty in obtaining accurate channel state information(CSI)for millimeter wave communication assisted by intelligent reflecting surfaces(IRS),we propose a deep learning-based channel estimation *** proposed scheme employs a hybrid active/passive IRS architecture,wherein the least square(LS)algorithm is initially utilized to acquire the channel estimate from the active ***,this estimation is interpolated to obtain a preliminary channel estimation and ultimately refined into an accurate estimate of the channel using the channel super-resolution convolutional neural network(Chan-SRCNN)deep learning *** simulation results demonstrate that the proposed scheme surpasses LS,orthogonal matching pursuit(OMP),synchronous OMP(SOMP),and deep neural network(DNN)channel estimation algorithms in terms of normalized mean squared error(NMSE)performance,thereby validating the feasibility of the proposed approach.

关键词： intelligent reflecting surface millimeter wave channel estimation deep learning

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