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Nonlinear optics of two-dimensional transition metal dichalcogenides

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InfoMat 2019年第3期1卷 317-337页

作者： xinglin wen Zibo Gong Dehui Li School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhanChina Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhanChina

Nonlinear optics(NLO)of transition metal dichalcogenides(TMDs)is promising for the on-chip photonic and optoelectronic *** this review,we will survey the current progress of NLO in ***,we will brief the basic theory of the NLO in ***,several important nonlinear processes in TMDs such as harmonic generation,four-wave mixing,saturable absorption,and two-photon absorption will be presented and their potential applications are also ***,the main strategies to tune,modulate,and enhance the NLO in TMDs are reviewed,including the excitonic effect,symmetry modulation,optical cavity enhancement,valley selection,edge state,and material ***,we give an outlook regarding some important issues and directions of NLO in TMDs.

关键词： NLO modulation and enhancement nonlinear devices nonlinear optics transition metal dichalcogenides

Chiral plasmonics and enhanced chiral light-matter interactions

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Science China(Physics,Mechanics & Astronomy) 2020年第4期63卷 62-72页

作者： Wei Du xinglin wen Davy Gerard Cheng-Wei Qiu Qihua Xiong Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 637371Singapore School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Light NanomaterialsNanotechnologies(L2n)Institut Charles DelaunayCNRSUniversite de Technologie de TroyesTroyes 10004France Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore MajuLab International Joint Research Unit UMI 3654CNRSUniversite Cote d'AzurSorbonne UniversiteNational University of SingaporeNanyang Technological UniversitySingapore 637371Singapore NOVITAS Nanoelectronics Center of ExcellenceSchool of Electrical and Electronic EngineeringNanyang Technological UniversitySingapore 639798Singapore

Chirality, which describes the broken mirror symmetry in geometric structures, exists macroscopically in our daily life as well as microscopically down to molecular levels. Correspondingly, chiral molecules interact differently with circularly polarized light exhibiting opposite handedness(left-handed and right-handed). However, the interaction between chiral molecules and chiral light is very weak. In contrast, artificial chiral plasmonic structures can generate "super-chiral" plasmonic near-field, leading to enhanced chiral light-matter(or chiroptical) interactions. The "super-chiral" near-field presents different amplitude and phase under opposite handedness incidence, which can be utilized to engineer linear and nonlinear chiroptical interactions. Specifically,in the interaction between quantum emitters and chiral plasmonic structures, the chiral hot spots can favour the emission with a specific handedness. This article reviews the state-of-the-art research on the design, fabrication and chiroptical response of different chiral plasmonic nanostructures or metasurfaces. This review also discusses enhanced chiral light-matter interactions that are essential for applications like chirality sensing, chiral selective light emitting and harvesting. In the final part, the review ends with a perspective on future directions of chiral plasmonics.

关键词： chirality chiral plasmonics chiral light-matter interactions sensing

Effect mechanism of nitrogen injection into fire-sealed-zone on residual-coal re-ignition under stress in goaf

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International Journal of Coal Science & Technology 2022年第5期9卷 138-149页

作者： Yongliang Xu Zejian Liu xinglin wen Lanyun Wang Zhiguang Lv Jindong Wu Minjie Li School of Safety Science and Engineering Henan Polytechnic University(HPU)Jiaozuo 454003China State Key Laboratory Cultivation Base for Gas Geology and Gas Control of HPU Jiaozuo 454003China Collaborative Innovation Center for Coal Safety Production and High-Efficient-Clean Utilization Jiaozuo 454003China

Coal is the one of foundations of energy and economic structure in China,while the unsealing of coal mine fres would cause a great risk of coal *** order to explore the infuence of pressure-bearing state on the re-ignition characteristics for residual coal,the uniaxial compression equipped with a temperature-programmed device was *** scanning electron microscope,synchronous thermal analyzer and Fourier transform infrared absorption spectrometer was applied to investigate the microscopic structure and thermal efect of the coal ***,the microscopic efect of uniaxial stress on coal re-ignition is revealed,and the re-ignition mechanism is also *** the uniaxial stress increasing,the number,depth and length of the fractures of the pre-treated coal *** application of uniaxial stress causes the thermal conductivity to change periodically,enhances the inhibition of injecting nitrogen on heat transfer and prolonges the duration of oxidation *** content of oxygen-containing functional groups has a high correlation with apparent activation energy,and coal samples at 6 MPa is more probability to re-ignite while the fre zone is *** stress could control the re-ignition mechanism by changing the structure of fractures and *** side chains and functional groups of coal structure are easier to be broken by thermal-stress *** higher the·OH content,the more difcult coal samples would be *** research results would lay a solid theoretical foundation for the safe unsealing of closed fre-areas underground,tighten the common bond between the actual industry and the experimental theory in closed fre-areas underground,and provide the theoretical guidance for coal re-ignition preventing.

关键词： Coal re-ignition Unsealed fre zone Uniaxial stress Thermal efect Re-ignition mechanism

Bose-Einstein condensation of exciton polariton in perovskites semiconductors

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Frontiers of Optoelectronics 2020年第3期13卷 193-195页

作者： xinglin wen Qihua XIONG School of Optical and Electronic Information and Wuhan National Laboratory for Optoclectronics Huazhong University of Science and TechnologyWuhan 430074China Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 637371Singapore

Polariton-hybridization of light-matter oscillations can emerge from various quasiparticles,such as phonon,plasmon,exciton and ***,exciton polaritons are bosonic quasiparticles with half-light,half-matter nature,which are originated from strong coupling between excitons and microcavity *** half-light nature results in extremely small effective mass,making it feasible to achieve high temperature even room-tempera-ture Bose-Einstein condensation(BEC).Meanwhile,the half-matter nature leads to strong nonlinear interaction,which is missing between photons and can promote the polaritons relaxation to ground state and give rise to low threshold polariton lasing,compared to photonic *** exciton polaritons are of great importance in applications of quantum simulation,topological quantum optics,ultrafast optical switch and low threshold lasers.

关键词： polar condensation Einstein

Te-seeded growth of few-quintuple layer Bi2Te3 nanoplates

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Nano Research 2014年第9期7卷 1243-1253页

作者： Yanyuan Zhao Maria de la Mata Richard L. J. Qiu Jun Zhang xinglin wen Cesar Magen Xuan P. A. Gao Jordi Arbiol Qihua Xiong Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological UniversitySingapore 637371 Institut de Ciencia de Materials de Barcelona ICMAB-CSIC E-08193 Bellaterra CAT Spain Department of Physics Case Western Reserve University Cleveland Ohio 44106 USA Laboratorio de Microscopfas Avanzadas (LMA) Instituto de Nanociencia de Aragon (INA) - ARAID and Departamento de Fisica de la Materia Condensada Universidad de Zaragoza 50018 Zaragoza Spain Institucio Catalana de Recerca i Estudis Avancats (ICREA) 08010 Barcelona CAT Spain NOVITAS Nanoelectronics Centre of Excellence School of Electrical and Electronic Engineering Nanyang Technological University Singapore 639798

We report on a Te-seeded epitaxial growth of ultrathin Bi2Te3 nanoplates （down to three quintuple layers （QL）） with large planar sizes （up to tens of micrometers） through vapor transport. Optical contrast has been systematically investigated for the as-grown Bi2Te3 nanoplates on the SiO2/Si substrates, experimentally and computationally. The high and distinct optical contrast provides a fast and convenient method for the thickness determination of few-QL Bi2Te3 nanoplates. By aberration-corrected scanning transmission electron microscopy, a hexagonal crystalline structure has been identified for the Te seeds, which form naturally during the growth process and initiate an epitaxial growth of the rhombohedral- structured Bi2Te3 nanoplates. The epitaxial relationship between Te and Bi2T% is identified to be perfect along both in-plane and out-of-plane directions of the layered nanoplate. Similar growth mechanism might be expected for other bismuth chalcogenide layered materials.

关键词： Te nucleation seed epitaxial growth Bi2Te3 few-quintuple layer TEM cross-section optical contrast

Identifying self-trapped excitons in 2D perovskites by Raman spectroscopy[Invited]

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Chinese Optics Letters 2021年第10期19卷 93-96页

作者： Junze Li Junchao Hu Jiaqi Ma xinglin wen Dehui Li School of Optical and Electronic Information and Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China

Two-dimensional(2D)perovskites exhibit broadband emission due to strong exciton–phonon coupling-induced self-trapped excitons and thus would find important applications in the field of white-light emitting ***,the available identifying methods for self-trapped excitons are currently rather limited and ***,we identify the existence of self-trapped excitons by Raman spectroscopy in both excited and non-excited *** excited states,the shifting of the Raman peak indicates the presence of the lattice distortion,which together with the extra Raman scattering peak reveals the presence of self-trapped *** work provides an alternative simple method to study self-trapped excitons in 2 D perovskites.

关键词： self-trapped excitons 2D perovskite Raman spectrum excited states

The models,theories and observation methods used for the coal mining above aquifer loaded high pressure

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The models,theories and observation methods used for the coa...

Site-controlled interlayer coupling in WSe_(2)/2D perovskite heterostructure

International Symposium on New Development in Rock Mechanics and Engineering

作者： Ge Wu xinglin wen Shandong Institute of Mining & Technology Taian China

＜正＞The models,theories and observation methods used for coal mining above aquifer having high pressure on different condition are discussed in this paper,based on the rock proporties of the floor between the extracted coal seam and the aquifer,that are:*** elastic continum formed from some thin hard rock beds:*** elastic rock mass formed from some thin hard rock beds with some weak combined interfaces:*** rheologic rock mass formed from some thin soft rock beds;*** fractured rock mass formed from some fractured hard rock beds with or without some weak combined Interfaces;*** others. There is a corresponding theory and observation method for coal mining above aquifer loaded high pressure having some kinds of floors, therefore,there are different intensions for so-called"Down-three-zone"theory,introduced by author.

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Science China Materials 2022年第5期65卷 1337-1344页

作者： Qinglin Wei xinglin wen Junchao Hu Yingying Chen Zeyi Liu Tinghao Lin Dehui Li School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Wuhan National Laboratory for Optoelectronics Optical Valley LaboratoryHuazhong University of Science and TechnologyWuhan 430074China

Interlayer excitons(IXs) formed in transition metal dichalcogenides(TMDs)/two-dimensional(2 D) perovskite heterostructures are emerging as new platforms in the research of excitons. Compared with IXs in TMD van der Waals heterostructures, IXs can be robustly formed in TMDs/2 D perovskite heterostructures regardless of the twist angle and thermal annealing process. Efficient control of interlayer coupling is essential for realizing their functionalities and enhancing their performances. Nevertheless, the study on the control of interlayer coupling strength between TMD and 2 D perovskites is elusive. Therefore, we realize the control of interlayer coupling between monolayer WSe_(2) and(iso-BA)_(2)PbI_(4) with SiO_(2) pillars in situ. An abnormal 10-nm blue shift and 2.5 times photoluminescence intensity enhancement were observed for heterostructures on the pillar, which was contrary to the red shift observed in TMD heterobilayers. We attributed the abnormal blue shift to the enhanced interlayer coupling arising from the reduced gap between constituent layers. In addition, IXs became more dominant over intralayer excitons with enhanced coupling. The interlayer coupling could be further engineered by tuning the height(h) and diameter(d)of pillars. In particular, an additional triplet IX showed up for the pillar with an h/d ratio of 0.6 due to the symmetry breaking of monolayer WSe_(2). The symmetry breaking also induced an anisotropic response of IXs. Our study is beneficial for tuning and enhancing the performance of IX-based devices, exciton localization and quantum emitters.

关键词： transition metal dichalcogenides 2D perovskites interlayer exciton interlayer coupling strength pillar

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采矿塌陷区矸石回填建村模式探讨

中国煤炭 2008年第9期34卷 8-10页

作者：常西坤郭惟嘉温兴林梁俊田山东科技大学矿山灾害预防控制实验室山东省青岛市经济技术开发区266510 肥城矿业集团公司曹庄煤矿有限公司山东省肥城市271601

在对矿井矸石充填污染性及颗粒级配试验分析的基础上,将曹庄煤矿采煤塌陷区治理与新农村建造结合起来,采用强夯法处理矸石地基,统一规划建造新农村住宅,并采取有效搬迁补偿措施,使村庄拆、迁工作在短时间内完成。

关键词：采矿塌陷区煤矸石充填村庄建设