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Light(Science & Applications) 2018年第1期7卷 755-765页

作者： Billy Lam chunlei guo The Institute of Optics University of RochesterRochesterNY 14627USA Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of Sciences130033 ChangchunChina

The ability of an interferometer to characterize the spatial information of a light beam is often limited by the temporal profile of the beam,with femtosecond pulse characterization being particularly *** this study,we developed a simple,stable,controllable shearing and vectorial phase-shifting wedged reversal shearing interferometer that is able to characterize all types of coherent and partially coherent light *** proposed interferometer consists of only a single beam splitter cube with one wedged entrance face and is insensitive to environmental vibration due to its common path configuration.A near zero-path length difference of the proposed interferometer ensures its operation for ultrashort pulses,providing,for the first time,a simple and stable interferometric tool to fully characterize sub-100 fs laser *** common beam characterization can be carried out with the interferometer,such as the amplitude,phase,polarization,wavelength,and pulse ***,this technique is sensitive to the wavefront tilt and can be used for precise beam ***,this interferometer can be an essential tool for beam characterization,optical imaging,and the testing required for a wide range of applications,including astronomy,biomedicine,ophthalmology,optical testing and imaging systems,and adaptive optics.

关键词： interferometer ultrashort shearing

Direct visualization of the complete evolution of femtosecond laser-induced surface structural dynamics of metals

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Light(Science & Applications) 2016年第1期5卷 58-64页

作者： Ranran Fang Anatoliy Vorobyev chunlei guo The Institute of Optics University of RochesterRochesterNY 14627USA School of Science Chongqing University of Posts and TelecommunicationsChongqingChina The guo China-US Photonics Laboratory Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchunChina

Despite extensive studies of femtosecond laser-material interactions,even the simplest morphological responses following femtosecond pulse irradiation have not been fully *** studies have revealed only partial *** we develop a zerobackground and high-contrast scattered-light-based optical imaging technique through which we capture,for the first time,the complete temporal and spatial evolution of the femtosecond laser-induced morphological surface structural dynamics of metals from start to finish,that is,from the initial transient surface fluctuations,through melting and ablation,to the end of *** find that transient surface structures first appear at a delay time on the order of 100 ps,which is attributed to ablation driven by pressure relaxation in the surface *** formation dynamics of the surface structures at different length scales are individually resolved,and the sequence of their appearance changes with laser fluence is *** and complete resolidification,observed here for the first time,are shown to occur more slowly than previously predicted by two orders of *** examine and identify the mechanisms driving each of these dynamic *** visualization and control of morphological surface structural dynamics not only are of fundamental importance for understanding femtosecond laser-induced material responses but also pave the way for the design of new material functionalities through surface structuring.

关键词： ablation femtosecond laser surface nano/microstructures ultrafast dynamics ultrafast imaging

Spatial Wavefunction Characterization of Femtosecond Pulses at Single-Photon Level

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Research 2020年第1期2020卷 341-348页

作者： Billy Lam Mohamed ElKabbash Jihua Zhang chunlei guo The Institute of Optics University of RochesterRochesterNew York 14627USA

Reading quantum information of single photons is commonly realized by quantum tomography or the direct(weak)measurement ***,these methods are time-consuming and face enormous challenges in characterizing single photons from an ultrafast light source due to the stringent temporal mode matching ***,we retrieve the spatial wavefunction of indistinguishable single photons from both a continuous wave source and a femtosecond light source using a self-referencing *** method only requires nine ensemble-averaged *** technique simplifies the measurement procedure of single-photon wavefunction and automatically mode matches each self-interfering single photon temporally,which enables the measurement of the spatial wavefunction of single photons from an ultrafast light source.

关键词： quantum consuming function

Plasmonic metasurfaces with 42.3% transmission efficiency in the visible

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Light(Science & Applications) 2019年第1期8卷 711-723页

作者： Jihua Zhang Mohamed ElKabbash Ran Wei Subhash CSingh Billy Lam chunlei guo The Institute of Optics University of RochesterRochesterNY 14627USA Changchun Institute of Optics Fine Mechanicsand PhysicsChinese Academy of Sciences130033 ChangchunChina

Metasurfaces are two-dimensional nanoantenna arrays that can control the propagation of light at *** particular,plasmonic metasurfaces feature ultrathin thicknesses,ease of fabrication,field confinement beyond the diffraction limit,superior nonlinear properties,and ultrafast ***,the technological relevance of plasmonic metasurfaces operating in the transmission mode at optical frequencies is questionable due to their limited *** state-of-the-art efficiency of geometric plasmonic metasurfaces at visible and near-infrared frequencies,for example,is ≤10%.Here,we report a multipole-interference-based transmission-type geometric plasmonic metasurface with a polarization conversion efficiency that reaches 42.3% at 744 nm,over 400% increase over the state of the *** efficiency is augmented by breaking the scattering symmetry due to simultaneously approaching the generalized Kerker condition for two orthogonal *** addition,the design of the metasurface proposed in this study introduces an air gap between the antennas and the surrounding media that confines the field within the gap,which mitigates the crosstalk between meta-atoms and minimizes metallic *** proposed metasurface is broadband,versatile,easy to fabricate,and highly tolerant to fabrication *** highlight the technological relevance of our plasmonic metasurface by demonstrating a transmission-type beam deflector and hologram with record efficiencies.

关键词： visible surfaces approaching

Degradation of platinum electrocatalysts for methanol oxidation by lead contamination

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Chinese Chemical Letters 2023年第2期34卷 610-612页

作者： Zihao Li Xianggui Zhou Subhash Singh Xiaoming Wei chunlei guo Weishan Li School of Physics and Optoelectronics South China University of TechnologyGuangzhou 510640China The Institute of Optics University of RochesterRochesterNew York 14627United States School of Chemistry South China Normal UniversityGuangzhou 510006China

Platinum exhibits high electrocatalytic activity toward various reactions but might be poisoned by some species. This communication reports a new finding that the electrocatalytic activity of platinum for methanol oxidation will be largely lost in a lead-contaminated environment. This activity loss is demonstrated in an electrochemical cell using a lead counter electrode for measuring the activity of platinum electrode towards methanol oxidation. The recorded methanol oxidation current in this cell is significantly decreased compared with that using a platinum counter electrode. The possible mechanism is related to the adsorption of trace lead ions from the lead counter electrode, as confirmed by comparing the calculated binding energies of platinum and lead ions with oxygen ion. This report is of great importance for reliably designing and efficiently managing direct methanol fuel cells, because trace lead might be present in various components in the fuel cell systems or in air and attention should be paid to its negative effect.

关键词： Activity degradation Platinum electrocatalyst Lead contamination Methanol oxidation Binding energy

Preliminary single-arm study of brain effects during transcutaneous auricular vagus nerve stimulation treatment of recurrent depression by resting-state functional magnetic resonance imaging

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Journal of Traditional Chinese Medicine 2022年第5期42卷 818-824页

作者： CHEN Limei SUN Jifei guo chunlei LI Xiaojiao WANG Zhi Hong Yang FANG Jiliang Radiology Department Guang'anmen Hospital of China Academy of Chinese Medical SciencesBeijing 10003China

OBJECTIVE:To examine the brain effects of transcutaneous auricular vagus nerve stimulation(ta VNS)treatment of recurrent depression based on the functional brain network by using resting-state functional magnetic resonance imaging(f MRI).METHODS:Twenty-five patients with recurrent depression were enrolled in a single-arm trial of ta VNS treatment for eight *** results were assessed by 17-item Hamilton Depression Rating Scale(HAMD-17),Hamilton Anxiety Scale(HAMA),Self-Rating Depression Scale(SDS),Self-Rating Anxiety Scale(SAS),and Ruminative Response Scale(RRS)***-state f MRI was conducted to explore the brain effects before and after *** the functional connectivity(FC)analysis,the bilateral nucleus accumbens,globus pallidus,caudate,and putamen were selected as ***,the correlations between FC and the clinical scale scores were ***:After treatment,the patients’scores of HAMD-17,HAMA,SDS,SAS,and RRS were significantly decreased(P<0.05).FC was considerably decreased between the following areas:the left globus pallidus and the right postcentral gyrus,inferior parietal gyrus,the right globus pallidus and the left superior marginal gyrus,postcentral gyrus,superior parietal gyrus,inferior parietal gyrus,precuneus,right postcentral gyrus,superior marginal gyrus,and inferior parietal gyrus,between the right caudate and the right lingual gyrus,calcarine gyrus,and *** in FC between the right globus pallidus and the left inferior parietal gyrus,between the left globus pallidus and the right postcentral gyrus were negatively correlated with HAMD-17 scores change before and after treatment(before,P=0.003,r=-0.6;after,P=0.009,r=-0.54).The change of FC between the right globus pallidus and the right postcentral gyrus was negatively correlated with the change in SDS(P=0.026,r=-0.474).The difference in FC between the right globus pallidus and the right postcentral gyrus was negatively correlated with the change in

关键词： recurrence depression magnetic resonance imaging basal ganglia default mode network transcutaneous auricular vagus nerve stimulation

Spectral absorption control of femtosecond laser-treated metals and application in solar-thermal devices

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Light(Science & Applications) 2020年第1期9卷 1851-1859页

作者： Sohail A.Jalil Bo Lai Mohamed ElKabbash Jihua Zhang Erik M.Garcell Subhash Singh chunlei guo The Institute of Optics University of RochesterRochesterNY 14627USA These authors contributed equally:Sohail A.JalilBo Lai

Direct femtosecond(fs)laser processing is a maskless fabrication technique that can effectively modify the optical,electrical,mechanical,and tribological properties of materials for a wide range of potential ***,the eventual implementation of fs-laser-treated surfaces in actual devices remains challenging because it is difficult to precisely control the surface *** studies of the morphological control of fs-laser-processed surfaces mostly focused on enhancing the uniformity of periodic ***,guided by the plasmon hybridisation model,we control the morphology of surface nanostructures to obtain more control over spectral light *** experimentally demonstrate spectral control of a variety of metals[copper(Cu),aluminium(Al),steel and tungsten(W)],resulting in the creation of broadband light absorbers and selective solar absorbers(SSAs).For the first time,we demonstrate that fs-laser-produced surfaces can be used as high-temperature *** show that a tungsten selective solar absorber(W-SSA)exhibits excellent performance as a high-temperature solar *** integrated into a solar thermoelectric generation(TEG)device,W-SSA provides a 130%increase in solar TEG efficiency compared to untreated W,which is commonly used as an intrinsic selective light absorber.

关键词： steel absorber metals

Modulating the optical and electrical properties of MAPbBr_(3) single crystals via voltage regulation engineering and application in memristors

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Light(Science & Applications) 2020年第1期9卷 957-967页

作者： Jun Xing Chen Zhao Yuting Zou Wenchi Kong Zhi Yu Yuwei Shan Qingfeng Dong Ding Zhou Weili Yu chunlei guo The guo Photonics Laboratory State Key Laboratory of Applied OpticsChangchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of Sciences130033 ChangchunChina University of Chinese Academy of Sciences 100049 BeijingChina State Key Laboratory of Supramolecular Structure and Materials Jilin University130012 ChangchunChina State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of Sciences130033 ChangchunChina The Institute of Optics University of RochesterRochesterNY 14627USA

Defect density is one of the most significant characteristics of perovskite single crystals(PSCs)that determines their optical and electrical properties,but few strategies are available to tune this ***,we demonstrate that voltage regulation is an efficient method to tune defect density,as well as the optical and electrical properties of PSCs.A three-step carrier transport model of MAPbBr_(3) PSCs is proposed to explore the defect regulation mechanism and carrier transport dynamics via an applied *** and steady-state photoluminescence measurements subsequently show that the surface defect density,average carrier lifetime,and photoluminescence intensity can be efficiently tuned by the applied *** particular,when the regulation voltage is 20 V(electrical poling intensity is 0.167 Vμm^(−1)),the surface defect density of MAPbBr_(3) PSCs is reduced by 24.27%,the carrier lifetime is prolonged by 32.04%,and the PL intensity is increased by 112.96%.Furthermore,a voltage-regulated MAPbBr_(3) PSC memristor device shows an adjustable multiresistance,weak ion migration effect and greatly enhanced device *** regulation is a promising engineering technique for developing advanced perovskite optoelectronic devices.

关键词： optical electrical defect

High-speed femtosecond laser plasmonic lithography and reduction of graphene oxide for anisotropic photoresponse

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Light(Science & Applications) 2020年第1期9卷 1351-1361页

作者： Tingting Zou Bo Zhao Wei Xin Ye Wang Bin Wang Xin Zheng Hongbo Xie Zhiyu Zhang Jianjun Yang chunlei guo State Key Laboratory of Applied Optics Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of Sciences130033 ChangchunChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences100049 BeijingChina Department of Electronic Information and Physics Changzhi University046011 ChangzhiChina Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of OpticsFine Mechanics and Physics(CIOMP)Chinese Academy of Sciences(CAS)130033 ChangchunChina The Institute of Optics University of RochesterRochesterNY 14627USA

Micro/nanoprocessing of graphene surfaces has attracted significant interest for both science and applications due to its effective modulation of material properties,which,however,is usually restricted by the disadvantages of the current fabrication ***,by exploiting cylindrical focusing of a femtosecond laser on graphene oxide(GO)films,we successfully produce uniform subwavelength grating structures at high speed along with a simultaneous in situ photoreduction ***,the well-defined structures feature orientations parallel to the laser polarization and significant robustness against distinct *** proposed model and simulations reveal that the structure formation is based on the transverse electric(TE)surface plasmons triggered by the gradient reduction of the GO film from its surface to the interior,which eventually results in interference intensity fringes and spatially periodic *** experiments prove that such a regular structured surface can cause enhanced optical absorption(>20%)and an anisotropic photoresponse(~0.46 ratio)for the reduced GO *** work not only provides new insights into understanding the laser-GO interaction but also lays a solid foundation for practical usage of femtosecond laser plasmonic lithography,with the prospect of expansion to other two-dimensional materials for novel device applications.

关键词： lithography polarization anisotropic

Comparative transcriptomic analysis highlights contrasting levels of resistance of Vitis vinifera and Vitis amurensis to Botrytis cinerea

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Horticulture Research 2021年第1期8卷 1316-1332页

作者： Ran Wan chunlei guo Xiaoqing Hou Yanxun Zhu Min Gao Xiaoyan Hu Songlin Zhang Chen Jiao Rongrong guo Zhi Li Xiping Wang State Key Laboratory of Crop Stress Biology in Arid Areas College of HorticultureNorthwest A&F University712100 YanglingXianyangShaanxiChina College of Horticulture Henan Agricultural University450002 ZhengzhouHenanChina College of Horticulture Science and Technology Hebei Normal University of Science and Technology066004 QinhuangdaoHebeiChina Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China Ministry of AgricultureNorthwest A&F University712100 YanglingXianyangShaanxiChina Boyce Thompson Institute for Plant Research Cornell UniversityIthacaNY 14853USA Grape and Wine Research Institute Guangxi Academy of Agricultural Sciences53000 NanningGuangxiChina

Botrytis cinerea is a major grapevine(Vitis spp.)pathogen,but some genotypes differ in their degree of *** example,the Vitis vinifera cultivar Red Globe(RG)is highly susceptible,but *** Rupr Shuangyou(SY)is highly ***,we used RNA sequencing analysis to characterize the transcriptome responses of these two genotypes to *** inoculation at an early infection *** a quarter of the genes in RG presented significant changes in transcript levels during infection,the number of which was greater than that in the SY *** genes differentially expressed between infected leaves of SY and RG included those associated with cell surface structure,oxidation,cell death and C/N *** found evidence that an imbalance in the levels of reactive oxygen species(ROS)and redox homeostasis probably contributed to the susceptibility of RG to *** leaves had strong antioxidant capacities and improved ROS homeostasis following *** network prediction suggested that WRKY and MYB transcription factors are associated with the abscisic acid *** gene correlation network analysis highlighted preinfection features of SY that might contribute to its increased ***,overexpression of VaWRKY10 in Arabidopsis thaliana and *** Thompson Seedless enhanced resistance to ***,our study provides a high-resolution view of the transcriptional changes of grapevine in response to *** infection and novel insights into the underlying resistance mechanisms.

关键词： Vitis resistance analysis