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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Luhe Zhang Zhi Wang Caiyun Li Longfei Zhu Mengjie Zhou Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Institute of Modern Optics Nankai University Tianjin China

Single-shot detection method based on photonic time-stretch of femtosecond laser pulses is proposed to obtain thermal response of materials. This process improves the traditional detection technology and has potential... 详细信息

ISBN: (数字)9781943580828

ISBN: (纸本)9781728176567

关键词： Pulse measurements Throughput Time measurement Optical fiber communication Ultrafast optics Research and development Photonics

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Liquid crystal integrated metamaterial for multi-band terahertz linear polarization conversion

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Chinese Optics Letters 2021年第9期19卷 127-132页

作者： Shitong Xu Fei Fan Hongzhong Cao Yinghua Wang Shengjiang Chang Shandong Provincial Key Laboratory of Laser Polarization and Information Technology Department of PhysicsSchool of Physics and EngineeringQufu Normal UniversityQufu 273165China Institute of Modern Optics Tianjin Key Laboratory of Micro-Scale Optical Information Science and TechnologyNankai UniversityTianjin 300350China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin 300350China

We experimentally investigate the linear polarization conversion for terahertz(THz)waves in liquid crystal(LC)integrated metamaterials,which consist of an LC layer sandwiched by two orthogonally arranged sub-wavelength metal gratings.A Fabry-Perot-like cavity is well constructed by the front and rear gratings,and it shows a strong local resonance mechanism,which greatly enhances the polarization conversion *** importantly,the Fabry-Perot-like resonance can be actively tuned by modulating the refractive index of the middle LC layer under the external *** a result,the integrated metamaterial achieves multi-band tunable linear polarization conversion.

关键词： terahertz liquid crystals metamaterial polarization conversion

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Nanotip design for high-resolution terahertz scattering-type scanning near-field optical microscopy

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Chinese Optics Letters 2024年第9期22卷 3-8页

作者： Zeliang Zhang Pengfei Qi Olga Kosavera Minghui Deng Cheng Gong Lie Lin Weiwei Liu Institute of Modern Optics Nankai UniversityTianjin 300350China Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology Tianjin 300350China Faculty of Physics Lomonosov Moscow State UniversityMoscow 119991Russia Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin 300350China

Terahertz(THz)scattering-type scanning near-field optical microscopy(s-SNOM)is an important means of studying and revealing material properties at the *** nanotip is one of the core components of THz s-SNOM,which has a decisive impact on the resolution of the *** this paper,we focus on the theory and design of the nanotip and conduct comprehensive research on it through *** theoretical model is based on full-wave numerical simulation and dipole moment analysis,which can describe the overall nanotip electromagnetic response under the incident field.A comprehensive design model of nanotip geometry,sample materials,and incident field is established to significantly improve the near-field coupling efficiency and spatial resolution to achieve optimal performance.

关键词： THz near field microscopy nanotip full-wave numerical simulation.

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Applications of G function in base station placement

Applications of G function in base station placement

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Asia-Pacific Conference on Communications

作者： Ting-ting Pan Hui Zhang Jia-yuan Hu Mu-ze Zhao Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Nankai University Tianjin China Department of Communication Engineering Nankai University

ISBN: (纸本)9781509006779

Recently, the rampant enlarging of networks scale have led to a growth in the number of mobile base stations. The research of mobile base stations is more meaningful under this circumstance. In the study of base station distribution, the distribution of base stations in many areas is subject to Poisson distribution. This paper takes three large cities in Britain as an example to explore whether their base station distribution is Poisson distribution in big cities of UK. We simulate the actual data distribution using R. By comparing and analyzing the distribution of base stations in these cities with G function, we conclude that the distribution of base stations differs by the density of local residents and other geographical features. Values of accumulation distribution function are always larger than values of nearest neighbor distance distribution function, and the nearest neighbor distance of observation point samples are shorter than for a Poisson process. However, when r reaches a high level, the degree of aggregation decreases gradually with the increasing of R.

关键词： Base stations Urban areas Distribution functions Mobile communication Rivers Conferences Mobile computing

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Few-cycle near-infrared pulses from a narrowband cw injection-seeded femtosecond optical parametric amplifier

Few-cycle near-infrared pulses from a narrowband cw injectio...

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Ultrafast Optics 2017

作者： Fan, Jintao Gu, Chenglin Liu, Bo Wang, Chingyue Hu, Minglie Ultrafast Laser Laboratory Key Laboratory of Opto-electronic Information Science and Technology of Ministry of Education College of Precision Instruments and Opto-electronics Engineering Tianjin University Tianjin300072 China State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai200062 China Key Laboratory of Optical Information Science and Technology Ministry of Education Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Institute of Modern Optics Nankai University Tianjin300350 China

We demonstrated for the first time pulse coherent synthesis of a sub-nanometer-linewidth cw injection seeded femtosecond OPA. Pulse durations as short as 19.2 fs (3.9-cycle) at 1.47 μm are readily obtained. © 20... 详细信息

ISBN: (纸本)9781510617162

关键词： Optical parametric amplifiers

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Terahertz polarization sensing,chirality enhancement,and specific binding based on metasurface sensors for biochemical detection:a review[Invited]

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Chinese Optics Letters 2023年第11期21卷 10-27页

作者：马良石伟楠范飞张子扬张天锐刘佳玥王湘晖常胜江 Institute of Modern Optics Nankai UniversityTianjin Key Laboratory of Micro-scale Optical Information Science and TechnologyTianjin 300350China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin 300350China Research Center for Intelligent Sensing Zhejiang LabHangzhou 311100China

Specific and highly-sensitive biochemical detection technology is particularly important in global epidemics and has critical applications in life science,medical diagnosis,and *** a newly developed technology,the THz metamaterialbased sensing method is a promising technique for extremely sensitive biomolecular ***,due to the significant resonant peaks generated by THz metamaterials,the characteristic absorption peaks of the analyte are usually masked,making it difficult to distinguish enantiomers and specifically identify target ***,new ways to overcome this limitation have become possible thanks to the emergence of chiral metasurfaces and the polarization sensing ***,functionalized metasurfaces modified by antibodies or other nanomaterials are also expected to achieve specific sensing with high *** this review,we summarize the main advances in THz metamaterials-based sensing from a historical perspective as well as application in chiral recognition and specific ***,we introduce the basic theory and key technology of THz polarization spectrum and chiral sensing for biochemical detection,and immune sensing based on biomolecular interaction is also *** mainly focus on chiral recognition and specific sensing using THz metasurface sensors to cover the most recent advances in the topic,which is expected to break through the limitations of traditional THz absorption spectroscopy and chiral spectroscopy in the visible-infrared band and develop into an irreplaceable method for the characterization of biochemical substances.

关键词： THz metamaterials polarization sensing technology specific sensing enhancement THz chiral spectrum biochemical substances detection

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Atomic switches of metallic point contacts by plasmonic heating

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Light(Science & Applications) 2019年第1期8卷 893-900页

作者： Weiqiang Zhang Hongshuang Liu Jinsheng Lu Lifa Ni Haitao Liu Qiang Li Min Qiu Bingqian Xu Takhee Lee Zhikai Zhao Xianghui Wang Maoning Wang Tao Wang Andreas Offenhausser Dirk Mayer Wang-Taek Hwang Dong Xiang Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Key Laboratory of Optical Information Science and TechnologyInstitute of Modern OpticsCollege of Electronic Information and Optical EngineeringNankai University300350 TianjinChina State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang University310027 HangzhouChina College of Engineering University of GeorgiaAthensGA 30602USA Department of Physics and Astronomy and Institute of Applied PhysicsSeoul National UniversitySeoul 08826Korea Institute of Materials Research and Engineering A*STAR2 Fusionopolis WayInnovisSingapore 138634Singapore Institute of Complex Systems ICS-8BioelectronicsResearch Center Juelich and JARA Fundamentals of Future Information TechnologyJülich 52425Germany

Electronic switches with nanoscale dimensions satisfy an urgent demand for further device miniaturization.A recent heavily investigated approach for nanoswitches is the use of molecular junctions that employ photochromic molecules that toggle between two distinct *** contrast to the reports on this approach,we demonstrate that the conductance switch behavior can be realized with only a bare metallic contact without any molecules under light *** demonstrate that the conductance of bare metallic quantum contacts can be reversibly switched over eight orders of magnitude,which substantially exceeds the performance of molecular *** the switch process,the gap size between two electrodes can be precisely adjusted with subangstrom accuracy by controlling the light intensity or *** by simulations,we reveal a more general and straightforward mechanism for nanoswitching behavior,i.e.,atomic switches can be realized by the expansion of nanoelectrodes due to plasmonic heating.

关键词： metallic behavior illumination

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MocNet: Less Motion Artifacts, More Clean MRI 1

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3rd International Conference on Artificial Intelligence, 2022

作者： Zhao, Bin Ding, Shuxue Wu, Mengran Liu, Guohua Cao, Chen Jin, Song Liu, Zhiyang Wu, Hong Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology College of Electronic Information and Optical Engineering Nankai University Tianjin300350 China School of Artificial Intelligence Guilin University of Electronic Technology Guangxi Guilin541004 China Key Laboratory for Cerebral Artery and Neural Degeneration of Tianjin Department of Medical Imaging Tianjin Huanhu Hospital Tianjin300350 China

ISBN: (数字)9789811694233

ISBN: (纸本)9789811694226

Magnetic Resonance Imaging is a common way of diagnosing related diseases. However, the magnetic resonance images are easily defected by motion artifacts in their acquisition process, which severely affects the clinicians’ diagnosis. To resolve the problem, we propose a motion correction network (MocNet) to correct motion artifacts. The experiments of motion artifacts simulation demonstrate that our MocNet outperforms the comparison methods with a mean PSNR of 34.397 ± 3.155 dB and a mean SSIM of 0.971 ± 0.015. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Magnetic resonance imaging

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Efficient Wide-Band Large-Angle Refraction and Splitting of a Terahertz Beam by Low-Index 3D-Printed Bilayer Metagratings

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Physical Review Applied 2020年第1期14卷 014064-014064页

作者： Xipu Dong Jierong Cheng Fei Fan Xianghui Wang Shengjiang Chang Institute of Modern Optics Nankai University Tianjin 300350 China Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology Tianjin 300350 China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin 300350 China

Near-perfect anomalous reflection and refraction have been demonstrated using passive lossless metasurfaces and metagratings operating at microwave, infrared, and visible frequencies, while related studies at terahertz frequencies are lacking. Here we propose low-index (with a refractive index of 1.57) 3D-printed dielectric metagratings for efficient wide-band diffraction engineering at low terahertz frequencies. A simplified analytical model reveals that the number of propagating waveguide modes inside the grating is a key factor in diffraction engineering, and is insufficient in a low-index design regardless of the detailed dimensions in a period. Additional waveguide modes are introduced in asymmetric bilayer and trilayer metagratings, providing sufficient degrees of freedom for efficient large-angle anomalous refraction and beam splitting. These metagratings are inherently wide-band, benefiting from low dispersion of the waveguide modes. Three metagratings are designed, 3D printed, and tested experimentally at 0.14 THz for 70∘ refraction, 80∘ refraction, and ±70∘ beam splitting. The measured efficiency shows good agreement with the design. The proposed metagratings, with simple structures and large feature sizes, can be easily scaled to applications at higher terahertz frequencies.

关键词： Beam optics Metamaterials Refraction Dielectrics Waveguides Microwave techniques Terahertz techniques

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FM and DTMB Signal Fingerprinting Positioning System Based on Multi-peak Gaussian Distribution Model

FM and DTMB Signal Fingerprinting Positioning System Based o...

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第十一届中国卫星导航年会

作者： Hongyu Qiao Hong Wu Menghuan Yang Hongzhao Peng Haixiao Yang Bin Zhao College of Electronic Information and Optical Engineering Nankai University Tianjin China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology

With the rapid development of wireless communication technology and the popularization of smart devices, all walks of life are constantly exploring location-based services in recent years. This paper

关键词： Indoor positioning Location fingerprint Multi-peak Gaussian distribution Probability matching

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