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A method for determining the complex refractive index dispersion of absorbing materials without thickness information

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Optoelectronics Letters 2024年第11期20卷 676-680页

作者： DENG Zhichao MEI Jianchun WANG Jin YE Qing tian jianguo Key Laboratory of Weak-Light Nonlinear Photonics Ministry of Education School of Physics and TEDA Applied Physics Nankai University

The complex refractive index dispersion(CRID) of absorbing materials is very important in many fields, especially in printing industry and medical research. However, due to their strong absorbing, CRID determination i... 详细信息

关键词： A

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花岗岩洞渣在抗渗混凝土中的应用性能研究

交通科学与工程 2024年第3期40卷 9-16页

作者：田建国中交一公局第一工程有限公司北京102205

为对隧道开挖过程中产生的大量废弃洞渣进行固废利用,以无岳高速WYTJ-07标段隧道施工项目为依托,用其产生的变质花岗岩配制机制碎石、机制砂;开展花岗岩抗渗混凝土配合比试验,揭示花岗岩洞渣对抗渗混凝土性能的影响规律,获得了C30P10花... 详细信息

为对隧道开挖过程中产生的大量废弃洞渣进行固废利用,以无岳高速WYTJ-07标段隧道施工项目为依托,用其产生的变质花岗岩配制机制碎石、机制砂;开展花岗岩抗渗混凝土配合比试验,揭示花岗岩洞渣对抗渗混凝土性能的影响规律,获得了C30P10花岗岩抗渗混凝土的最优配合比。试验结果表明:通过分析花岗岩洞渣的力学性能及岩石成分,判定该隧道花岗岩洞渣能满足要求,可以用来配制抗渗混凝土;根据不同配合比混凝土的坍落度、28 d抗压强度、抗渗等级,发现降低水胶比以及增大外加剂掺量能有效提高花岗岩抗渗混凝土的工作性能;当水灰比为0.43、外加剂掺量为1.1%时,C30P10花岗岩抗渗混凝土的性能满足要求,且最为经济。

关键词：混凝土变质花岗岩配合比优化渗透性抗压强度

Theoretical Analysis on Self-Defocusing Mode-Locking in a Ring Resonator

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Chinese Physics Letters 1994年第2期11卷 79-82页

作者： ZANG Weiping tian jianguo ZHANG Guangyin Department of Physics Nankai UniversityTianjin 300071

A theoretical analysis of passive mode-locking in a thermal-stable ring cavity containing a Kerr medium and an aperture is *** analysis employing the beam propagation theory shows that the power dependence of the cavity loss is extremely sensitive to the relative location of the Kerr medium and the aperture,and is different for the counterpropagating modes,so the unidirectional operation is *** combination of Kerr medium with an aperture acts as a p sition feedback,which is similar to the effect of a saturable absorber.

关键词： passive cavity absorber

Dirac points and the transition towards Weyl points in three-dimensional sonic crystals

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Light(Science & Applications) 2020年第1期9卷 36-44页

作者： Boyang Xie Hui Liu Hua Cheng Zhengyou Liu jianguo tian Shuqi Chen The Key Laboratory of Weak Light Nonlinear Photonics Ministry of EducationSchool of PhysicsTEDA Institute of Applied Physicsand Renewable Energy Conversion and Storage CenterNankai University300071 TianjinChina The Key Laboratory of Artificial Micro-and Nanostructures of the Ministry of Education and School of Physics and Technology Wuhan University430072 WuhanChina The Collaborative Innovation Center of Extreme Optics Shanxi University030006 TaiyuanShanxiChina The Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal University250358 JinanChina

A four-fold-degenerate three-dimensional(3D)Dirac point,represents a degenerate pair of Weyl points carrying opposite ***,3D Dirac crystals have shown many exotic features different from those of Weyl *** these features evolve from 3D Dirac to Weyl crystals is important in research on 3D topological ***,we realized a pair of 3D acoustic Dirac points from band inversion in a hexagonal sonic crystal and observed the surface states and helical interface states connecting the Dirac ***,each Dirac point can transition into a pair of Weyl points with the introduction of chiral *** exotic features of the surface states and interface states are inherited by the resulting Weyl *** work may serve as an ideal platform for exploring exotic physical phenomena in 3D topological semimetals.

关键词： Dirac degenerate topological

A Modified‘Position Dispersion’Method for Nonlinear Refraction Index Measurement

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Chinese Physics Letters 1994年第1期11卷 20-23页

作者： tian jianguo ZANG Weiping CHEN Jian MA Chao ZHANG Guangyin Department of Physics Nankai UniversityTianjin 300071

In this report,a modified‘position dispersion’method,in which the detecting aperture in the far-field is replaced by a circular board,is given to enhance the measurement sensitivity of nonlinear index,while keeps the *** increase of 5 times in sensitivity is obtained in our experiment,in which we employed a solution to produce the thermally induced nonlinearity.

关键词： Dispersion simplicity Nonlinear

Nonlinear optical properties of graphene-based materials

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Chinese Science Bulletin 2012年第23期57卷 2971-2982页

作者： LIU ZhiBo ZHANG XiaoLiang YAN XiaoQing CHEN YongSheng tian jianguo Key Laboratory of Weak Light Nonlinear Photonics Ministry of Education Teda Applied Physics School and School of Physics Nankai University Tianjin 300071 China College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan 030024 China Key Laboratory of Functlonal Polymer Materials and Center for Nanoscale Science & Technology Institute of Polymer Chemistry College of Chemistry Nankai University Tianjin 300071 China

Graphene,a two-dimensional carbon atom sheet,has attracted tremendous attention and research interest because of its exceptional physical *** has high mobility and optical transparency,in addition to flexibility,robustness and environmental *** main focus so far has been on fundamental physics and electronic ***,because the linear dispersion of the Dirac electrons enables ultrawideband tunability,we believe its true potential lies in photonics and *** this review,we introduce recent advances in the nonlinear optical properties of graphene-based *** rise of graphene in nonlinear optics is shown by several recent results,ranging from saturable absorbers and the four-wave mixing effect to giant two-photon absorption,reverse saturable absorption and optical *** relevant forms of the graphene-based materials include pure graphene,graphene oxide and graphene hybrids.

关键词： graphene nonlinear optical properties optical limiting saturable absorber graphene oxide

Q-switched and mode-locked Er-doped fiber laser using PtSe2 as a saturable absorber

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Photonics Research 2018年第9期6卷 893-899页

作者： KANG ZHANG MING FENG YANGYANG REN FANG LIu XINGSHUO CHEN JIE YANG XIAO-QING VAN FENG SONG jianguo tian Key Laboratory of Weak-Light Nonlinear Photonics Ministry of EducationSchool of Physics and TEDA Applied Physics SchoolNankai UniversityTianjin 300071China

We report a passively Q-switched and mode-locked erbium-doped fiber laser(EDFL) based on PtSe_2, a new two-dimensional material, as a saturable absorber(SA). Self-started Q-switching at 1560 nm in the EDFL was achieved at a threshold pump power of 65 mW, and at the maximum pump power of 450 m W, the maximum single Q-switched pulse energy is 143.2 n J. Due to the polarization-dependent characteristics of the PtSe_2-based SA, the laser can be switched from the Q-switched state to the mode-locked state by adjusting the polarization state. A mode-locked pulse train with a repetition rate of 23.3 MHz and a pulse width of 1.02 ps can be generated when the pump power increases to about 80 m W, and the stable mode-locked state is maintained until the pump power reaches its maximum 450 m W. The maximum single mode-locked pulse energy is0.53 nJ. This is the first time to our knowledge that successful generation of stable Q-switched and mode-locked pulses in an Er-doped fiber laser has been obtained by using PtSe_2 as a saturable absorber.

关键词：二维材光纤激光器通讯技术发展现状

Solution-processable graphene mesh transparent electrodes for organic solar cells

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Nano Research 2013年第7期6卷 478-484页

作者： Qian Zhang Xiangjian Wan Fei Xing Lu Huang Guankui Long Ningbo Yi Wang Ni Zhibo Liu jianguo tian Yongsheng Chen Key Laboratory for Functional Polymer Materials and Centre for Nanoscale Science and Technology Institute of Polymer Chemistry College of Chemistry Nankai University Tianjin 300071 China The Key Laboratory of Weak Light Nonlinear Photonics Ministry of Education Teda Applied Physics School and School of Physics Nankai University Tianjin 300071 China

Graphene mesh electrodes （GMEs） with good conductivity and transparency have been fabricated by the standard industrial photolithography and 02 plasma etching process using graphene solutions. Organic photovoltaic （OPV） cells using GMEs as the transparent electrodes with a blend of poly-（3-hexylthiophene） phenyl-C61-butyric acid methyl ester （P3HT/PC61BM） as the active layer have been fabricated and exhibit a power conversion efficiency （PCE） of 2.04%, the highest PCE for solution-processed graphene transparent electrode-based solar cells reported to date.

关键词： graphene transparent electrode photolithography mesh electrode organic photovoltaic cells

Electromagnetic wave manipulation based on few-layer metasurfaces and polyatomic metasurfaces

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ChemPhysMater 2022年第1期1卷 6-16页

作者： Shiwang Yu Jiaqi Cheng Zhancheng Li Wenwei Liu Hua Cheng jianguo tian Shuqi Chen The Key Laboratory of Weak Light Nonlinear Photonics Ministry of EducationRenewable Energy Conversion and Storage CenterSchool of Physics and TEDA Institute of Applied PhysicsNankai UniversityTianjin 300071China The Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Metasurfaces,whose electromagnetic(EM)responses can be artificially designed,are two-dimensional arrays composed of subwavelength *** by various fascinating developments in the past decade,metasurfaces have been proved as a powerful platform for the implementation of EM wave ***,the planar monoatomic metasurfaces widely used in previous works have limited design freedoms,resulting in some disadvantages for the realization of high-performance and new functional EM wave *** latest developments show that few-layer metasurfaces and polyatomic metasurfaces are good alternatives to overcome the drawbacks of planar monoatomic metasurfaces and realize high-efficient,multi-band and broad-band EM *** provide additional degrees of design freedom via introducing multilayer layouts or combining multiple meta-atoms into a unit cell ***,recent advances of few-layer and polyatomic metasurfaces are *** design strategies,EM properties and main advantages of few-layer metasurfaces and polyatomic metasurfaces are overviewed ***,few-layer metasurfaces and polyatomic metasurfaces in recent progress for EM wave manipulation are classified and discussed from the viewpoint of their design *** last,an outlook on future development trends and potential applications in these fast-developing research areas is presented.

关键词： EM wave manipulation Few-layer metasurfaces Polyatomic metasurfaces Collective interference