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External field-strengthened Ostwald nanowelding

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Nano research 2022年第5期15卷 4525-4535页

作者： Moxia Li Xi Xie Yaomengli Xu Jianfang Liu Yanan Fu Mei Han Xucheng Li Xidong Duan Changjun Min Jiawen Hu Hunan Key Laboratory of Two-Dimensional Materials Advanced Catalytic Engineering Research Center of the Ministry of Educationand College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China nanophotonics research center Shenzhen Key Laboratory of Micro-Scale Optical Information Technology&Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China State Key Laboratory for Physical Chemistry of Solid Surfaces Xiamen UniversityXiamen 361005China

The accomplishment of nanowelding typically requires the input of high energy,possibly causing appreciable damages to the brittle ***,we report an external field(EF,i.e.,light,direct current(DC),and alternating current(AC))-strengthened Ostwald nanowelding(ONW)strategy to enable low-temperature nanowelding of Au nanoparticles(NPs)with nanoscale spacing in solution and propose an electron localization mechanism to understand *** reveal that the EF-derived local electrons not only greatly strengthen the dissolution of surface atoms and the reduction of Au3+ions dissolved,but also confine(together with ordered water molecules)the transport of Au^(3+)ions within the ***,the electrochemical Ostwald ripening(OR)process of the Au NPs is actively strengthened,which,along with the local electron-strengthened surface atom diffusion(as a result of the strong electrostatic repulsion created),enables feasible ONW for solution processing of interdigital electrodes(IDEs)from Au NPs and high-performance transparent conductor(TC)from Ag nanowires(NWs).Our low-temperature nanowelding strategy offers an efficient interconnection technique for the processing of functional nanodevices from individual nanomaterials.

关键词： external field(EF) Ostwald ripening(OR) nanowelding Au nanoparticle(NP) Ag nanowire(NWs)

Interaction of colliding laser pulses with gas plasma for broadband coherent terahertz wave generation

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Photonics research 2023年第9期11卷 1562-1569页

作者： YUXUAN CHEN YUHANG HE LIYUAN LIU ZHEN TIAN JIANMING DAI center for Terahertz Waves and School of Precision instrument and Opto-electronics engineering Tianjin UniversityTianjin 300072China

Colliding of two counter-propagating laser pulses is a widely used approach to create a laser field or intensity *** experimentally demonstrate broadband coherent terahertz(THz)radiation generation through the interaction of colliding laser pulses with gas *** THz radiation has a dipole-like emission pattern perpendicular to the laser propagation direction with a detected peak electric field 1 order of magnitude higher than that by single pulse *** a proof-of-concept demonstration,it provides a deep insight into the physical picture of laser–plasma interaction,exploits an important option to the promising plasma-based THz source,and may find more applications in THz nonlinear near-field imaging and spectroscopy.

关键词： laser coherent interaction

Single-layered non-interleaved spin-insensitive metasurfaces for wavefront engineering

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Chinese Optics Letters 2023年第1期21卷 32-37页

作者： Ata Ur Rahman Khalid Naeem Ullah 韩遇 Urooj Asghar 袁小聪冯甫 nanophotonics research center Shenzhen Key Laboratory of Micro-Scale Optical Information Technology&Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518000China College of Physics and Optoelectronics engineering Shenzhen UniversityShenzhen 518000China Beijing engineering research center for Mixed Reality and advanced Display School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China Department of Physics Forman Christian College-UniversityLahore 54600Pakistan

Metasurfaces,two-dimensional(2D)or quasi-2D arrays of dielectric or metallic meta-atoms,offer a compact and novel platform to manipulate the amplitude,phase,and polarization of incoming wavefronts in a desired manner by engineering the geometry of *** polarization control,spin-insensitive metasurfaces have attracted significant attention due to the robustness of circular polarization against the beam misalignment and multi-path *** now,several efforts have been made to realize polarization-insensitive metasurfaces for circularly polarized(CP)wavefront manipulation;however,these metasurfaces only consider the cross-polarization channels and keep the co-polarization channels *** metasurfaces cannot be considered truly spin-insensitive,as one has to carefully choose the analyzer at ***,by combining the polarization-insensitive geometric phase and engineered propagation phase,we propose a spin-insensitive design principle based on metasurfaces that can perform identical functionality(on co-and crosspolarization channels)irrespective of the handedness of incident/transmitted *** a proof of concept,we design and numerically realize two types of spin-insensitive wavefront engineering devices:(1)spin-insensitive meta-hologram and(2)spin-insensitive beam deflector with power splitting *** proposed work is expected to open up new avenues for developing spin-independent metasurfaces-based devices.

关键词： metasurface spin-insensitivity meta-hologram beam splitter

A switchable dual-wavelength erbium-doped fiber laser based on saturable absorber and active optical fiber ring filter

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Optoelectronics Letters 2014年第6期10卷 434-438页

作者：祝连庆陈青山赵冉冉娄小平何巍 Beijing Key Laboratory of Optoelectronic Measurement Technology Beijing Engineering Research Center of Optoelectronic Information and Instrument Beijing Information Science & Technology University School of instrument Science and Optoelectronics engineering Hefei University of Technology

A dual-wavelength erbium-doped fiber laser(EDFL) with outstanding stability is presented. In the fiber laser system, two nested active optical fiber ring filters are configured to improve the comb spectrum performance, a saturable absorber is employed to form a gain grating for both filtering and frequency stabilizing, two cascaded fiber Bragg gratings(FBGs) are utilized to achieve dual-wavelength output, and a variable attenuator is arranged to adjust output power. Experimental results illustrate that the peak wavelength drift is less than 3 pm, and a good linear relationship between output power and pump power is realized.

关键词： Active filters Erbium Fiber lasers Fibers Saturable absorbers

Highly luminescent and stable lead-free cesium copper halide perovskite powders for UV-pumped phosphor-converted light-emitting diodes

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Photonics research 2020年第6期8卷 768-775页

作者： LINGLING XIE BINGKUN CHEN FA ZHANG ZHENG ZHAO XINXIN WANG LIJIE SHI YUE LIU LINGLING HUANG RUIBIN LIU BINGSUO ZOU YONGTIAN WANG Beijing Key Laboratory of nanophotonics and Ultrafine Optoelectronic Systems School of PhysicsBejing Institute of TechnologyBeijing 100081China Bejjing engineering research center of Mixed Reality and advanced Display School of Optics and PhotonicsBejjing Institute of Technology Bejjing 100081China AICFVE of Bejing Film AcademyBejing 100088China

Lead halide perovskites have drawn extensive attention over recent decades owing to their outstanding photo-electric ***,their toxicity and instability are big issues that need to be solved for further ***,we adopt a facile dry ball milling method to synthesize lead-free Cs3Cu2X5(X=I,CI)perovskites with photoluminescence(PL)quantum yield up to 60%.The optical features including broad emission spectrum,large Stokes shift,and long PL lifetime can be attributed to self-trapped exciton *** as-synthesized blue emissive Cs3Cu2I5 and green emissive Cs3Cu2Cl5 lead-free perovskite powders have good thermal stability and ***,UV-pumped phosphor-converted light-emitting diodes were obtained by using Cs3Cu2I5 and Cs3Cu2Cl5 as phosphors.

关键词： stability. perovskite converted

Accurate measurement of aerosol optical properties using the multilongitudinal mode high-spectral-resolution lidar with self-tuning Mach-Zehnder interferometer

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Chinese Optics Letters 2023年第3期21卷 1-7页

作者：高飞高丰佳杨潇李改盼杨帆李仕春汪丽华灯鑫 Samo Stanič School of Mechanical and Precision instrument engineering Xi'an University of TechnologyXi'an 710048China center for Atmospheric research University of Nova GoricaSI-5000 Nova GoricaSlovenia

The multilongitudinal mode[MLM]high-spectral-resolution lidar[HSRL]based on the Mach±Zehnder interferometer[MZI]is constructed in Xi’an for accurate measurements of aerosol optical *** critical requirement of the optimal match between the free spectral range of MZI and the longitudinal mode interval of the MLM laser is influenced by the laboratory temperature,pressure,and *** realize the optimal separation of aerosol Mie scattering signals and molecular Rayleigh scattering signals excited by the MLM laser,a self-tuning technique to dynamically adjust the optical path difference[OPD]of the MZI is proposed,which utilizes the maximum ratio between the received power of the Mie channel and Rayleigh channel as the criterion of the OPD *** preliminary experiments show the feasibility of the MLM-HSRL with self-tuning MZI and the stable performance in the separation of aerosol Mie scattering signals and molecular Rayleigh scattering signals.

关键词： high-spectral-resolution lidar aerosol optical properties multilongitudinal mode laser self-tuning Mach±Zehnder interferometer

Quadrupole-Linear Ion Trap Tandem Mass Spectrometry System for Clinical Biomarker Analysis

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engineering 2022年第9期16卷 56-64页

作者： Xiang Fang Jie Xie Shiying Chu You Jiang Yuting An Chang Li Xiaoyun Gong Rui Zhai Zejian Huang Chunling Qiu Xinhua Dai Technology Innovation center of Mass Spectrometry for State Market Regulation Center for Advanced Measurement ScienceNational Institute of MetrologyBeijing 100029China College of instrument Science and Electrical engineering Jilin UniversityChangchun 130026China

The accurate and efficient measurement of small molecule disease markers for clinical diagnosis is of great *** this study,a quadrupole-linear ion trap(Q-LIT)tandem mass spectrometer was designed and built in our *** precursor ions were first selected in the quadrupole,and then injected,trapped,and fragmented simultaneously in the linear ion trap(LIT)to reduce the space charge effect,enrich the target product ions,and promote *** targeted analytes were measured with selected reaction monitoring using a positive scan mode with electrospray ionization(ESI).Ions with a mass-to-charge ratio(m/z)ranging from 195 to 2022 were *** scanning at 1218amu.s^(-1),unit resolution and an accuracy of higher than m/z 0.28 was obtained for m/z up to *** dimensionless Mathieu parameter(q)value used in this study was 0.40 for collision-induced dissociation(CID),which was activated by resonance *** an overall CID efficiency of 64%was achieved(activation time,50 ms).Guanidinoacetic acid(GAA)and creatine(CRE)were used as model compounds for small molecule clinical *** limits of quantification were 1.0 and 0.2 nmol.L^(-1)for GAA and CRE,respectively.A total of 77 actual samples were successfully analyzed by the home-built ESI-Q-LIT tandem mass spectrometry *** developed method can reduce matrix interference,minimize space charge effects,and avoid the chromatographic separation of complex samples to simplify the pretreatment *** novel Q-LIT system is expected to be a good candidate for the determination of biomarkers in clinical diagnosis and therapeutics.

关键词： Linear ion trap Quadrupole Space charge effect Collision-induced dissociation Biomarker

Hot-electron emission-driven energy recycling in transparent plasmonic electrode for organic solar cells

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InfoMat 2022年第3期4卷 121-130页

作者： Jing-De Chen Ling Li Chao-Chao Qin Hao Ren Yan-Qing Li Qing-Dong Ou Jia-Jia Guo Shi-Jie Zou Feng-Ming Xie Xianjie Liu Jian-Xin Tang Jiangsu Key Laboratory for Carbon-Based Functional Materials&Devices Institute of Functional Nano&Soft Materials(FUNSOM)Soochow UniversitySuzhouJiangsuChina College of Physics and Materials Science Henan Normal UniversityXinxiangHenanChina School of Physics and Electronic Science Ministry of Education Nanophotonics&Advanced Instrument Engineering Research CenterEast China Normal UniversityShanghaiChina Department of Materials Science and engineering Monash UniversityClaytonVictoriaAustralia Laboratory of Organic Electronics Department of Science and Technology(ITN)Linköping UniversityNorrköpingSweden Macao Institute of Materials Science and engineering(MIMSE) Macao University of Science and TechnologyTaipaMacao SARChina

Plasmonic metal electrodes with subwavelength nanostructures are promising for enhancing light harvesting in ***,the nonradiative damping of surface plasmon polaritons(SPPs)during coupling with sunlight results in the conversion of the excited hot-electrons to heat,which limits the absorption of light and generation of ***,an energy recycling strategy driven by hotelectron emission for recycling the SPP energy trapped in the plasmonic electrodes is proposed.A transparent silver-based plasmonic metal electrode(A-PME)with a periodic hexagonal nanopore array is constructed,which is combined with a luminescent organic emitter for radiative recombination of the injected *** to the suppressed SPP energy loss via broadband hot-electron emission,the A-PME achieves an optimized optical transmission with an average transmittance of over 80%from 380 to 1200 ***,the indium-tin-oxide-free organic solar cells yield an enhanced light harvestingwith a power conversion efficiency of 16.1%.

关键词： energy recycling hot-electron emission organic solar cells plasmonic electrode surface plasmon polariton

High tolerance detour-phase graphene-oxide flat lens

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Photonics research 2021年第12期9卷 2454-2463页

作者： SHIBIAO WEI GUIYUAN CAO HAN LIN HAORAN MU WENBO LIU XIAOCONG YUAN MICHAEL SOMEKH BAOHUA JIA nanophotonics research center Shenzhen Key Laboratory of Micro-Scale Optical Information TechnologyShenzhen UniversityShenzhen 518060China Centre for Translational Atomaterials Faculty of EngineeringScience and TechnologySwinburne University of TechnologyHawthornVIC 3122Australia The Australian research Council(ARC)Industrial Transformation Training Centre in Surface engineering for advanced Materials(SEAM) Swinburne University of TechnologyHawthornVIC 3122Australia

Flat lenses thinner than a wavelength promise to replace conventional refractive lenses in miniaturized optical ***,Fresnel zone plate flat lens designs require dense annuli,which significantly challenges nanofabrication ***,we propose a new implementation of detour phase graphene flat lens with flexible annular number and *** graphene metalenses demonstrated that with a flexible selection of the line density and width,the metalenses can achieve the same focal length without significant *** will significantly weaken the requirement of the nanofabrication system which is important for the development of large-scale flat lenses in industry applications.

关键词： phase replace annular