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Saturable absorption and visible pulse modulation of few-layer topological nodal-line semimetal HfGeTe

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Chinese Optics Letters 2024年第3期22卷 89-94页

作者：赵启明张首焱王树贤王刚于浩海张怀金 state key laboratory of crystal materials and institute of crystal materials Shandong UniversityJinan 250100China Beijing National laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Topological nodal-line semimetals attract growing research attention in the photonic and optoelectronic fields due to their unique topological energy-level bands and fascinating nonlinear optical ***,to the best of our knowledge,we first report the saturable absorption property of topological nodal-line semimetal HfGeTe and the related pulse modulation in passively Q-switched visible ***-layer HfGeTe demonstrates outstanding saturable absorption properties in the visible-light band,yielding the saturation intensities of 7.88,12.66,and 6.64μJ/cm^(2)at 515,640,and 720 nm,*** on an as-prepared few-layer HfGeTe optical switch and a Pr:LiYF_(4)gain medium,Q-switched visible lasers are also successfully achieved at 522,640,and 720 *** minimum pulse widths of the green,red,and deep-red pulsed lasers are150,125.5,and 420 ns,*** for the green and red pulsed laser,the obtained pulse width is smaller than those of the low-dimensional layered *** work sheds light on the application potential of topological nodal-line semimetals in the generation of visible pulsed lasers.

关键词： visible pulsed laser topological nodal-line semimetals saturable absorption Q-switching Pr doping

Direct amplification of femtosecond optical vortices in a single-crystal fiber

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Photonics Research 2024年第1期12卷 27-32页

作者： CHANGSHENG ZHENG TIANYI DU LEI ZHU ZHANXIN WANG KANGZHEN TIAN YONGGUANG ZHAO ZHIYONG YANG HAOHAI YU VALENTIN PETROV Jiangsu key laboratory of Advanced Laser materials and Devices School of Physics and Electronic EngineeringJiangsu Normal UniversityXuzhou 221116China state key laboratory of crystal materials and institute of crystal materials Shandong UniversityJinan 250100China Max Born institute for Nonlinear Optics and Short Pulse Spectroscopy 12489 BerlinGermany

Spatially twisted light with femtosecond temporal structure is of particular interest in strong-field physics and light–matter ***,present femtosecond vortex sources exhibit limited power handling capabilities,and their amplification remains an ongoing challenge particularly for high-order orbital angular momentum(OAM)states due to several inherent technical ***,we exploit a straightforward approach to directly amplify a femtosecond optical vortex(FOV,OAM=-8?)by using a two-stage single-crystal fiber(Scf)amplifier system without pulse stretching and compression in the time domain,delivering 23-W,163-fs pulses at a repetition rate of1 *** spatial and temporal features are well-conserved during the amplification,as well as the high modal purity(>96%).The results indicate that the multi-stage Scf amplifier system is particularly suited for direct amplification of high-order *** generated high-power femtosecond OAM laser beams are expected to help reveal complex physical phenomena in light–matter interactions and pave the way for practical applications in attoscience,laser plasma acceleration,and high-dimension micromachining.

关键词： fiber amplifier crystal

Review on birefringence in borates based on birefringence-active functional groups and arrangements

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Science China Chemistry 2024年第7期67卷 2155-2170页

作者： Qianzhen Zhang Ran An Zhihua Yang Xifa Long Shilie Pan Yun Yang Research Center for crystal materials State Key Laboratory of Functional Materials and Devices for Special Environmental ConditionsXinjiang Key Laboratory of Functional Crystal MaterialsThe Xinjiang Technical Institute of Physics&ChemistryChinese Academy of SciencesUrumqi 830011China Center of materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

As a fundamental parameter of the optical crystals,birefringence plays a vital role in many optical applications,such as phase modulation,light splitting,and polarization,especially the phase matching process of the nonlinear optical *** big birefringence not only benefits to the miniaturization of related devices,but also broadens the phase-matching wavelength range of nonlinear optical *** design and synthesis of crystals with large birefringence becomes a hot research topic due to its more and more important applications in the optical modulation and laser technology ***,crystals with birefringence greater than 0.05 in the borate system are reviewed and classified according to different birefringent active groups,and the relationship between structure and properties is thoroughly *** is hoped that this review will provide a clear understanding of what kinds of building units and arrangements would have more opportunity to get adequate birefringence in borate systems and provide the statistical references to encourage the emergence of better crystal materials with large birefringence.

关键词： birefringence borate optical functional crystal structural anisotropy arrangement of functional units

Experimental distillation of tripartite quantum steering with an optimal local filtering operation

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Photonics Research 2024年第3期12卷 552-562页

作者： QIAN-XI ZHANG XIAO-XU FANG HE LU School of Physics State Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100China Shenzhen Research institute of Shandong University Shenzhen 518057China

Multipartite Einstein-Podolsky-Rosen(EPR)steering admits multipartite entanglement in the presence of uncharacterized verifiers,enabling practical applications in semi-device-independent *** applications generally require stronger steerability,while the unavoidable noise weakens steerability and consequently degrades the performance of quantum information ***,we propose the local filtering operation that can maximally distill genuine tripartite EPR steering from N copies of three-qubit generalized Greenberger-Horne-Zeilinger states,in the context of two semi-device-independent *** optimal filtering operation is determined by the maximization of assemblage *** and numerical results indicate the advantage of the proposed filtering operation when N is finite and the steerability of initial assemblages is ***,a proof-of-principle demonstration of two-copy distillation is realized with the optical *** advantage of the optimal local filtering operation is confirmed by the distilled assemblage in terms of higher assemblage fidelity with perfectly genuine tripartite steerable assemblages,as well as the greater violation of the inequality to witness genuine tripartite steerable *** results benefit the distillation of multipartite EPR steering in practice,where the number of copies of initial assemblages is generally finite.

关键词： filtering distillation optimal

Single-atom catalysts supported on graphene/electride heterostructures for the enhanced sulfur reduction reaction in lithium-sulfur batteries

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Journal of Energy Chemistry 2024年第10期97卷 738-746页

作者： Siyun Qi Chuanchuan Li Gang Chen Mingwen Zhao School of Physics and Electronics Shandong Normal University Qingdao Industrial Energy Storage Research institute Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences School of Physics & state key laboratory of crystal materials Shandong University

Single-atom catalysts（SACs） hold great promise in addressing the sluggish kinetics of the sulfur reduction reaction（SRR） in lithium-sulfur（Li-S） batteries for their unique catalytic activity and maximum atom *** these SACs must be dispersed on solid substrates,the underlying support is usually limited to carbon materials that have a poor ability to modulate the coordination environment and electronic structures of single atoms,and consequently their catalytic activity toward the SRR is *** we propose two-dimensional（2D） graphene/electride heterostructu res as substrates to enhance the catalytic activities of SACs for Li-S batteries.2D electrides featuring the anionic electron gas on their surface enable efficient electron transfer to SACs,which alters their electronic structures,resulting in the shifts of the d orbital and Fermi *** unique electronic structure decreases the filling of antibonding states such that the bonding with adsorbates at active sites is *** demonstrate the enhanced catalytic performance of SACs in terms of the Gibbs free energy of SRR and Li2S *** addition,a universal descriptor for the rapid screening of SACs is established by a linear regression fitting *** work provides a new design strategy to modulate SAC activity through electrides for Li-S batteries.

关键词： Charge transfers DFT calculations Electrides Kinetics Universal descriptors

Simple substituents make big differences in photophysical performances of 2,1,3-benzothiadizole-conjugated spiropyrans

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Chinese Journal of Chemical Engineering 2024年第08期 53-59页

作者： Xiaoming Zhu Yunting Liu Mingyue Cao Guangle Niu state key laboratory of crystal materials Shandong University School of Chemistry and Chemical Engineering Beijing Institute of Technology

Developing multifunctional spiropyran dyes is of particular importance in diverse applications. In the present study, we synthesized two 2,1,3-benzothiadiazole-conjugated spiropyrans（BT-SP-NO2and BTSP-NMe2） with distinct substituents. These donor-acceptor-structured spiropyrans exhibited typical twisted intramolecular charge transfer features and strong emissions in low-polarity solvents with fluorescence quantum yields（QYs） of up to 90.7%. Like traditional spiropyrans, the electron-acceptor-substituted BT-SP-NO2exhibited excellent photochromic behavior under multiple alternating UV—Vis irradiation, while the electron-donor-substituted BT-SP-NMe2was an acidochromic dye. In addition,the substituent groups distinctly affected the packing modes of these spiropyrans in the solid state. BTSP-NMe2showed a much stronger solid-state emission（QY of 59.0%） than BT-SP-NO2. Moreover, these two dyes were utilized as biocompatible probes for the specific light-up imaging of lipid droplets.

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Electrospinning-derived functional carbon-based materials for energy conversion and storage

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Chinese Chemical Letters 2024年第6期35卷 3-13页

作者： Xinyu Ren Hong Liu Jingang Wang Jiayuan Yu institute for Advanced Interdisciplinary Research(iAIR) School of Chemistry and Chemical EngineeringUniversity of JinanJi’nan 250022China state key laboratory of crystal materials Shandong UniversityJi’nan 250100China

The over-exploitation of fossil fuel energy has brought about serious environmental *** would be of great significance to construct efficient energy conversion and storage system to maximize utilize renewable energy,which contributes to reducing environmental *** the past few years,in terms of electrocatalysis and energy storage,carbon fiber materials show great advantages due to its outstanding electrical conductivity,good flexibility and mechanical *** a simple and low-cost technique,electrospinning can be employed to prepare various *** is noted that the functional fiber materials with different special structure and composition can be obtained for energy conversion and storage by combining electrospinning with other *** this paper,the structural design,controllable synthesis and multifunctional applications of electrospinning-derived functional carbon-based materials(EFCMs)is ***,we briefly introduce the history,basic principle and typical equipment of *** we discuss the strategies for preparing EFCMs with different structures and composition in *** addition,we show recently the application of advanced EFCMs in energy conversion and storage,such as nitrogen species reduction reaction,CO_(2) reduction reaction,oxygen reduction reaction,water-splitting,supercapacitors and ion *** the end,we propose some perspectives on the future development direction of EFCMs.

关键词： Electrospinning Carbon materials Functional fiber Energy conversion Energy storage Electrocatalysis

NaBSOwith unprecedented[BSO]double chains and largest birefringence among borosulfates induced by the uniform arrangement of[BO] units

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Science China Chemistry 2024年

作者： Jinbin Fan Ziting Yan Zilong Chen Huimin Li Zhihua Yang Fangfang Zhang Shilie Pan Research Center for crystal materials State Key Laboratory of Functional Materials and Devices for Special Environmental ConditionsXinjiang Key Laboratory of Functional Crystal Materials Xinjiang Technical institute of Physics and Chemistry Chinese Academy of Sciences Center of materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences

Birefringence is crucial for birefringent crystals to modulate polarized light and nonlinear optical crystals to enable *** is closely related to the arrangement of advantageous functional groups with large microcosmic polarizability anisotropy in the ***,designing crystals with large birefringence by modulating the arrangement of advantageous functional groups is still a *** this work,the arrangement of the advantageous[B3O7]groups is optimized by introducing rigid tetrahedral[SO4]groups,resulting in a novel boron-rich borosulfate,Na2B6SO13,which exhibits unprecedented[B6SO13]∞double chain and an enhanced birefringence （Δn=0.07 at 589.3 nm） against the borate parent *** calculations confirm that the birefringence is mainly attributable to the uniform alignment of[B3O7]***2B6SO13also possesses a deep ultraviolet （DUV） cutoff edge （λcrystals with large birefringence by inducing the arrangement of advantageous functional groups.

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Investigation of reflection anisotropy induced by micropipe defects on the surface of a 4H-SiC single crystal using scanning anisotropy microscopy

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Chinese Physics B 2024年第3期33卷 630-637页

作者：黄威俞金玲刘雨彭燕王利军梁平陈堂胜徐现刚刘峰奇陈涌海 key laboratory of Semiconductor materials Science Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China College of materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049China National key laboratory of Solid-state Microwave Devices and Circuits Nanjing Electronic Devices InstituteNanjing 210016China institute of Micro/Nano Devices and Solar Cells School of Physics and Information EngineeringFuzhou UniversityFuzhou 350108China state key laboratory of crystal materials Shandong UniversityJinan 250100China

Optical reflection anisotropy microscopy mappings of micropipe defects on the surface of a 4H-SiC single crystal are studied by the scanning anisotropy microscopy(SAM)*** reflection anisotropy(RA)image with a'butterfly pattern'is obtained around the micropipes by *** RA image of the edge dislocations is theoretically simulated based on dislocation theory and the photoelastic *** comparing with the Raman spectrum,it is verified that the micropipes consist of edge *** different patterns of the RA images are due to the different orientations of the Burgers ***,the strain distribution of the micropipes is also *** can identify the dislocation type,the direction of the Burgers vector and the optical anisotropy from the RA image by using ***,SAM is an ideal tool to measure the optical anisotropy induced by the strain field around a defect.

关键词： scanning anisotropy microscopy SiC reflection anisotropy edge dislocation