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Field-induced transformation of ferroelectric domain states in KTN crystal

Chinese Optics Letters 2021年第11期19卷 77-81页

作者： Quanxin Yang Xiaojin Li Hongliang Liu Yingying Ren Pengfei Wu Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology Institute of Modern OpticsNankai UniversityTianjin 300350China State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100China Shandong Provincial Engineering and Technical Center of Light Manipulations&Shandong Provincial Key Laboratory of Optics and Photonic Device School of Physics and ElectronicsShandong Normal UniversityJinan 250358China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin 300350China

We report an interesting study of electric-field-induced transformation from a single domain ferroelectric state to the multiple domain ferroelectric state in a KTa_(1-x)Nb_(x)O_(3)(KTN) crystal. Experimental results obtained using the confocalμ-Raman spectroscopy confirm the dynamic change of lattice structures induced by an external electric ***, the dependence of relative permittivity on the applied voltage also indicates the transformation of ferroelectric states involving the processes of splintering, inversion, and re-formation of ferroelectric domains.

关键词： KTN ferroelectric state domain state transformation field-induced phenomenon

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Dynamic relaxation process of a 3D super crystal structure in a Cu:KTN crystal

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Chinese Optics Letters 2020年第2期18卷 61-65页

作者： Quanxin Yang Xin Zhang Hongliang Liu Xuping Wang Yingying Ren Shan He Xiaojin Li Pengfei Wu Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Institute of Modern OpticsNankai UniversityTianjin 300071China Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and ScienceXiangyang 441053China Advanced Materials Institute Qilu University of Technology(Shandong Academy of Sciences)Jinan 250014China Shandong Provincial Engineering and Technical Center of Light Manipulations&Shandong Provincial Key Laboratory of Optics and Photonic Device School of Physics and ElectronicsShandong Normal UniversityJinan 250358China

In this Letter,we report the existence and relaxation properties of a critical phenomenon on called a 3D super crystal that emerges at T=TC?3.5℃,that is,in the proximity of the Curie temperature of a Cu:KTN *** dynamics processes of a 3D super crystal manifest in its formation containing polarized nanometric regions and/or polarized ***,with strong coupling and interaction of microcomponents,the characteristic relaxation time measured by dynamic light scattering demonstrates a fully new relaxation mechanism with a much longer relaxation *** the relaxation mechanism of a relaxator is so-far undetermined,this research provides a novel *** results can help structure a fundamental theory of ferroelectric relaxation.

关键词： KTN relaxation time dynamic light scattering micronano structure

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Device-free multiple people daily activity recognition using the channel state information of Wi-Fi signals

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International Journal of Smart Home 2016年第9期10卷 103-112页

作者： Al-qaness, Mohammed Abdulaziz Aide Li, Fangmin Key Laboratory of Fiber Optical Sensing Technology and Information Processing Ministry of Education Hubei Key Laboratory of Broadband Wireless Communication and Sensor Network Wuhan University of Technology Wuhan430070 China

This paper demonstrates on the problem of device-free multiple people daily activity recognition, which is very crucial for human computer interaction. The main idea of this paper lies in that we introduce channel state information of Wi-Fi signals to recognize multiple people daily activity. Channel state information is used in the receiver end to analyze features of a communication channel to detect tampering through the transmitter. In order to alleviate the negative influence of radio frequency interference, we define window size to build up vectors of Channel state information. Afterwards, the proposed device-free multiple people daily activity recognition method is implemented by solving the sparse representation classification problem using minimization. To testify the effectiveness of the proposed method, we set the experiment setting with a bedroom and a living room;moreover, two persons and a cat are set in this experiment. Experiments results show that proposed device-free multiple people daily activity recognition method is able to promote activity recognition accuracy under different experiment settings.

关键词： Channel state information

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OAM-Based Wireless Optical Communication using Vortex Beams in Oceanic Turbulent Environment

OAM-Based Wireless Optical Communication using Vortex Beams ...

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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Baoluo Yan Changjin Li Xiaolong Li Haifeng Liu Bo Liu Hao Zhang Jianguo Liu Wei Lin Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Institute of Modern Optics Nankai University Tianjin China State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences Beijing China

We analyze OAM modal propagation properties of three vortex beams under strictly consistent condition. These results show that Lommel-Gaussian beams, BG beams and LG beams respectively possess the highest, moderate an... 详细信息

ISBN: (纸本)9781943580705

关键词： Atmospheric turbulence Optical angular momentum Optical wireless communication Refractive index Turbulence effects Vortex beams

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Engineering Interlayer Hybridization in Energy Space via Dipolar Overlayers

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Chinese Physics Letters 2023年第8期40卷 92-98页

作者：邵斌姜肖 Jan Berges 孟胜黄兵 College of Electronic Information and Optical Engineering and Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network TechnologyNankai UniversityTianjin 300350China Beijing Computational Science Research Center Beijing 100193China Institut für Theoretische Physik Bremen Center for Computational Materials Scienceand MAPEX Center for Materials and ProcessesUniversit?t BremenBremen D-28359Germany Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Department of Physics Beijing Normal UniversityBeijing 100875China

The interlayer hybridization(IH)of van der Waals(vdW)materials is thought to be mostly associated with the unignorable interlayer overlaps of wavefunctions(t)in real ***,we develop a more fundamental understanding of IH by introducing a new physical quantity,the IH admixture ratioα.Consequently,an exotic strategy of IH engineering in energy space can be proposed,i.e.,instead of changing t as commonly used,αcan be effectively tuned in energy space by changing the on-site energy difference(2Δ)between neighboring-layer *** practice,this is feasible via reshaping the electrostatic potential of the surface by deposing a dipolar overlayer,e.g.,crystalline *** first-principles calculations unveil that IH engineering via adjusting 2Δcan greatly tune interlayer optical transitions in transition-metal dichalcogenide bilayers,switch different types of Dirac surface states in Bi_(2)Se_(3)thin films,and control magnetic phase transition of charge density waves in 1H/1T-TaS_(2)bilayers,opening new opportunities to govern the fundamental optoelectronic,topological,and magnetic properties of vdW systems beyond the traditional interlayer distance or twisting engineering.

关键词： interlayer neighboring electrostatic

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Terahertz response of Bi-substituted rare-earth iron garnet

Terahertz response of Bi-substituted rare-earth iron garnet

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International Conference on Infrared and Millimeter Waves

作者： Yi-Lei. Li Qi-Ye. Wen Fei. Fan Ding. Zhang Qing-Hui. Yang State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Institute of Modern Optics Nankai University Tianjin China

The terahertz optical and magneto-optical response of Bi-substituted rare-earth iron garnet film were studied from 0.2 to 1.2 THz. The thickness of film is 406 μm. The maximum transmittance is over 55% near the frequency point of 0.35 THz. When the external magnetic field change from -100 mT to +100 mT, the Faraday rotation angle is between -5° and +7°. Large Verdet constants approaching 270 °/T/mm are found. The overall change of ellipticity is relatively small.

关键词： Faraday effect Garnet films Iron Optical films Magnetic fields

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A Novel 1.03 ppm/°C Wide-Temperature-Range Curvature-Compensated Bandgap Voltage Reference

A Novel 1.03 ppm/°C Wide-Temperature-Range Curvature-Compen...

引用

International Conference on Circuits, System and Simulation (ICCSS)

作者： Jinlong Hu Jie Sun Yangbo Bai Huachao Xu Tao Du Guofeng Li Yao Chen Tianjin Complex System Control Theory and Application Key Laboratory Tianjin University of Technology Tianjin China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Nankai University Tianjin China Advance Digital Sciences Center Singapore

ISBN: (纸本)9781538678206

This paper proposes a novel bandgap voltage reference with an accurate curvature compensation technique for completely compensating the thermal nonlinearity of the emitter-base voltage. With VIS 0.15 standard CMOS process, the proposed bandgap voltage reference circuit achieves temperature coefficient of 1.03 ppm/°C over the temperature range from -55°C to 155°C with the supply voltage of 1.8V. In addition, the circuit achieves line regulation performance of 0.02%/V with the supply voltage from 1.8V to 3V and the power supply rejection (PSR) levels are 83dB, 77dB, 58dB at ultra-low frequency (

关键词： Photonic band gap Temperature Temperature dependence Resistors Transistors Voltage control Low voltage

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Research and Design of Frequency Quadrupler Based on CMOS 1

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11th International Conference on Communications, Signal Processing, and Systems, CSPS 2022

作者： Wang, Hai Wang, Zhihong Sun, Guiling Jiang, Xiaomei Bi, Chaoran Zhang, Ying Teaching Center for Experimental Electronic Information College of Electronic Information and Optical Engineering Nankai University Tianjin300350 China Department of Electronic Information Science and Technology College of Electronic Information and Optical Engineering Nankai University Tianjin300350 China College of Media Design Tianjin Modern Vocational Technology College Tianjin300350 China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin300071 China

ISBN: (数字)9789819926534

ISBN: (纸本)9789819926527

With the continuous development of wireless communication technology, the public has an increasingly strong demand for modern communication systems with better performance. As a vital component of RF front-end circuit, frequency multiplier is usually applied in the transmitter to generate high-frequency signal. CMOS integrated circuit, with the advantages of high integration, small volume and low cost, is widely used in communication, radar, civil, military and other fields. This paper focuses on the operating principle of frequency multiplier and the design method of triode frequency multiplier. Based on CMOS technology, a quadrupler with 4GHz output frequency is designed with ADS simulation software after debugging and optimization, which is applied to undergraduate teaching of professional experiment of electronic information science and technology. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： CMOS integrated circuits

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Acoustic diagnostics of femtosecond laser filamentation

arXiv

引用

arXiv 2023年

作者： Shang, Binpeng Zhang, Nan Qi, Pengfei Tao, Shishi Lin, Lie Liu, Weiwei Institute of Modern Optics Nankai University Tianjin300350 China Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology Tianjin300350 China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin300350 China

The promising application of femtosecond laser filamentation in atmospheric remote sensing brings imperative demand for diagnosing the spatiotemporal dynamics of filamentation. Acoustic emission (AE) during filamentation opens a door to give the insight into the dynamic evolution of filaments in air. In particular, the frequency features of the acoustic emission provide relevant information on the conversion of laser energy to acoustic energy. Here, the acoustic emission of femtosecond laser filament manipulated by energy and the focal lengths was measured quantitatively by a broadband microphone, and the acoustic parameters were compared and analyzed. Our results showed that the acoustic power presents a squared dependence on the laser energy and the bandwidth of the acoustic spectrum showed a significant positive correlation with laser energy deposition. It was found that the spectrum of the acoustic pulse emitted from the middle of the filament has a larger bandwidth compared to those emitted from the ends of the filament and the spectrum of the acoustic pulse is also an indicator of the filament intensity distribution. These findings are helpful for studying the plasma filament properties and complex dynamic processes through acoustic parameters and allow the optimization of remote *** Codes 78A60 Copyright © 2023, The Authors. All rights reserved.

关键词： Elastic waves

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Magnetically Active Terahertz Beam Steering Based on Phase Gradient Metasurface with Liquid Crystal-Enhanced Cavity Mode Conversion

SSRN

引用

SSRN 2022年

作者： Ji, Yunyun Jiang, Xinhao Fan, Fei Zhao, Huijun Cheng, Jierong Wang, Xianghui Chang, Shengjiang Institute of Modern Optics Nankai University Tianjin300350 China Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology Tianjin300350 China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin300350 China

Terahertz beam steering, especially the efficient modulations, is highly desired for possible applications in wireless communication, radar, and remote sensing. Here, by integrating the phase-gradient metasurfaces and tunable liquid crystal materials, we demonstrate an active terahertz beam steering device based on linear polarization conversion modes. The resonant modes in the photonic cavity formed by double-layer metasurface and the introduction of tunable anisotropic liquid crystal materials into the cavity not only improve the polarization conversion efficiency of the device, but also dynamically adjust the resonance matching conditions. As a consequence, a beam steering of 47.5° with 50% diffraction intensity at 0.69 THz is achieved in the x -to- y polarization conversion mode, and this beam can be actively modulated with an ultrahigh modulation depth of 99.6% by magnetically rotating the anisotropic optical axis of liquid crystals. Moreover, the proposed device can also work as the beam steering of 32.5° in the y -to- x polarization conversion mode at 0.937 THz with a maximum diffraction intensity of 38% and an intensity modulation depth of 97.8%. This work is expected to provide a new scheme for dynamic manipulation of terahertz beam steering and beam shaping. © 2022, The Authors. All rights reserved.

关键词： Liquid crystals

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