检索结果-南通市图书馆

维普期刊数据库博看期刊

Recent advances in laser self-injection locking to high-Q microresonators

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2023年第2期18卷 89-130页

作者： Nikita M.Kondratiev Valery E.Lobanov artem E.Shitikov Ramzil R.Galiev Dmitry A.Chermoshentsev Nikita Yu.Dmitriev Andrey N.Danilin Evgeny A.Lonshakov Kirill N.Min’kov Daria M.Sokol Steevy J.Cordette Yi-Han Luo Wei Liang Junqiu Liu Igor A.Bilenko Directed Energy Research Centre Technology Innovation InstituteAbu DhabiUnited Arab Emirates Russian Quantum Center MoscowRussia Skolkovo Institute of Science and Technology SkolkovoRussia Moscow Institute of Physics and Technology DolgoprudnyMoscow RegionRussia Faculty of Physics Lomonosov Moscow State UniversityMoscowRussia Shenzhen Institute for Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China International Quantum Academy Shenzhen 518048China Key Laboratory of Nanodevices and Applications Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Hefei National Laboratory University of Science and Technology of ChinaHefei 230026China

The stabilization and manipulation of laser frequency by means of an external cavity are nearly ubiquitously used in fundamental research and laser applications. While most of the laser light transmits through the cavity, in the presence of some back-scattered light from the cavity to the laser, the self-injection locking effect can take place, which locks the laser emission frequency to the cavity mode of similar frequency. The self-injection locking leads to dramatic reduction of laser linewidth and noise. Using this approach, a common semiconductor laser locked to an ultrahigh-Q microresonator can obtain sub-Hertz linewidth, on par with state-of-the-art fiber lasers. Therefore it paves the way to manufacture high-performance semiconductor lasers with reduced footprint and cost. Moreover, with high laser power, the optical nonlinearity of the microresonator drastically changes the laser dynamics, offering routes for simultaneous pulse and frequency comb generation in the same microresonator. Particularly, integrated photonics technology, enabling components fabricated via semiconductor CMOS process, has brought increasing and extending interest to laser manufacturing using this method. In this article, we present a comprehensive tutorial on analytical and numerical methods of laser self-injection locking, as well a review of most recent theoretical and experimental achievements.

关键词： self-injection locking laser stabilization microresonator nonlinearity single-frequency lasing multi-frequency lasing

利用基于扫描相机的荧光寿命成像显微技术研究细胞周期

在线全文

学校读者我要写书评

暂无评论

中国激光 2011年第3期38卷 127-132页

作者：王岩赵羚伶陈同生许改霞 artem Pliss Tymish Y.Ohulchanskyy Paras N.Prasad 屈军乐牛憨笨深圳大学光电子学研究所光电子器件与系统教育部重点实验室广东深圳518060 纽约州立大学布法罗分校激光、光子学和生物光子学研究所纽约布法罗14260-3000 华南师范大学激光生命科学教育部重点实验室及激光生命科学研究所广东广州510631

利用基于扫描相机的荧光寿命成像显微系统,以细胞周期为模型,研究转染绿色荧光蛋白的HeLa细胞的荧光寿命。结果表明,处于周期内不同进程的细胞的荧光寿命为2.50-3.00 ns。处于分裂期的细胞的荧光寿命在1 h内从2.86 ns下降到2.82 ns;在DN... 详细信息

利用基于扫描相机的荧光寿命成像显微系统,以细胞周期为模型,研究转染绿色荧光蛋白的HeLa细胞的荧光寿命。结果表明,处于周期内不同进程的细胞的荧光寿命为2.50-3.00 ns。处于分裂期的细胞的荧光寿命在1 h内从2.86 ns下降到2.82 ns;在DNA合成前期的8 h内,荧光寿命从2.82 ns下降到2.78 ns。荧光寿命的差异反映了细胞周期中核浆内大分子浓度的变化,对了解细胞周期的分子机制有一定的意义。

关键词：成像系统扫描相机荧光寿命成像细胞周期 HeLa细胞

Specification and Analysis of Discrete Behavior of Hybrid Systems in the Workbench ISMA

在线全文

学校读者我要写书评

暂无评论

Open Journal of Applied Sciences 2013年第2期3卷 51-55页

作者： Yury V. Shornikov Dmitry N. Dostovalov Maria S. Myssak artem N. Komarichev Andrey M. Tolokonnikov Department of Automated Control Systems Novosibirsk State Technical University Novosibirsk Russia

Hybrid systems are important in applications in CAD, real-time software, robotics and automation, mechatronics, aeronautics, air and ground transportation systems, process control, and have recently been at the center of intense research activity in the control theory, computer-aided verification, and artificial intelligence communities. In the past several years, methodologies have been developed to model hybrid systems, to analyze their behavior, and to synthesize controllers that guarantee closed-loop safety and performance specifications. These advances have been complemented by computational tools for the automatic verification and simulation of hybrid systems. Modern technologies of computer simulation tools include preparing, debugging, analysis and calculation of effective program models, meaningful interpretation of research results.

关键词： Hybrid System Statechart Event Detection Differential-algebraic Equations Simulation Tools

Light-stimulated adaptive artificial synapse based on nanocrystalline metal-oxide film

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Opto-Electronic Science 2023年第10期2卷 1-11页

作者： Igor S.Balashov Alexander A.Chezhegov artem S.Chizhov Andrey A.Grunin Konstantin V.Anokhin Andrey A.Fedyanin Faculty of Physics Lomonosov Moscow State UniversityMoscow 119991Russia Faculty of Chemistry Lomonosov Moscow State UniversityMoscow 119991Russia Institute for Advanced Brain Studies Lomonosov Moscow State UniversityMoscow 119991Russia P.K.Anokhin Research Institute of Normal Physiology Moscow 125315Russia.

Artificial synapses utilizing spike signals are essential elements of new generation brain-inspired *** this paper,we realize light-stimulated adaptive artificial synapse based on nanocrystalline zinc oxide *** artificial synapse photoconductivity shows spike-type signal response,long and short-term memory(LTM and STM),STM-to-LTM transition and paired-pulse *** is also retaining the memory of previous exposures and demonstrates spike-frequency adaptation properties.A way to implement neurons with synaptic depression,tonic excitation,and delayed accelerating types of response under the influence of repetitive light signals is *** developed artificial synapse is able to become a key element of neuromorphic chips and neuromorphic sensorics systems.

关键词： neuromorphic photonics synaptic adaptation spiking neuron neuromorphic computing optoelectronic synaptic devises nanocrystalline metal-oxide film

在线全文

学校读者我要写书评

暂无评论

透明致密单质钠

物理 2011年第8期40卷 505-509页

作者：马琰铭李印威 Eremets Mikhail Oganov artem R 吉林大学超硬材料国家重点实验室长春130012 美因茨大学石溪大学

传统高压理论认为,高压可以有效地缩短金属内部的原子间距,导致价带和导带展宽,进而使其金属性增强.然而,目前实验可达到的压力条件已能够将物质压缩到原子的芯电子发生重叠的状态.这一高压效应会使金属发生复杂的结构相变,使之具有独... 详细信息

传统高压理论认为,高压可以有效地缩短金属内部的原子间距,导致价带和导带展宽,进而使其金属性增强.然而,目前实验可达到的压力条件已能够将物质压缩到原子的芯电子发生重叠的状态.这一高压效应会使金属发生复杂的结构相变,使之具有独特的晶体结构和无法用传统理论来描述的电子性质.传统理论曾预言,简单金属锂和钠在高压下会出现原子配对而导致的非金属相,但这一预言没有得到后续理论和实验的支持.本研究将理论模拟和高压实验相结合,发现金属钠在200万大气压下转变为一种新型物质状态——光学透明的宽带隙绝缘态.绝缘态钠具有简单而独特的晶体结构——c轴高度压缩的双六角密堆结构.高压钠的绝缘态不是早期理论预言的原子配对的结果,而是p和d轨道电子杂化,以及芯电子云之间高度交叠的结果.钠原子的价电子受芯电子排斥而高度局域在晶格间隙中,这些在间隙中被"冻结"的价电子完全失去了自由电子的特性,表现出绝缘特性.当压力促使原子的芯电子发生强烈重叠时,这种新型绝缘状态可以在其他元素和化合物中存在.

关键词：钠高压晶体结构金属-绝缘体转变

Stacking transition in rhombohedral graphite

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2019年第1期14卷 67-73页

作者： Tataiana Latychevskaia Seok-Kyun Son Yaping Yang Dale Chancellor Michael Brown Servet Ozdemir Ivan Madan Gabriele Berruto Fabrizio Carbone artem Mishchenko Kostya S. Novoselov Institute of Physics Laboratory for Ultrafast Microscopy and Electron Scattering (LUMES)école Polytechnique Fédérale de Lausanne (EPFL) CH-1015 Lausanne Switzerland National Graphene Institute University of Manchester Oxford Road Manchester M13 9PL UK School of Physics and Astronomy University of Manchester Oxford Road Manchester M13 9PL UK

Few-layer graphene (FLG) has recently been intensively investigated for its variable electronic properties, which are defined by a local atomic arrangement. While the most natural arrangement of layers in FLG is ABA (Bernal) stacking, a metastable ABC (rhombohedral) stacking, characterized by a relatively high-energy barrier, can also occur. When both types of stacking occur in one FLG device, the arrangement results in an in-plane heterostructure with a domain wall (DW). In this paper, we present two approaches to demonstrate that the ABC stacking in FLG can be controllably and locally turned into the ABA stacking. In the first approach, we introduced Joule heating, and the transition was characterized by 2D peak Raman spectra at a submicron spatial resolution. The transition was initiated in a small region, and then the DW was controllably shifted until the entire device became ABA stacked. In the second approach, the transition was achieved by illuminating the ABC region with a train of 790-nm-wavelength laser pulses, and the transition was visualized by transmission electron microscopy in both diffraction and dark-field imaging modes. Further, using this approach, the DW was visualized at a nanoscale spatial resolution in the dark-field imaging mode.

关键词： graphene graphite van der Waals heterostructures domain wall Raman spectroscopy transmission electron microscopy electron diffraction structural transition

Cu-Au nanoparticles produced by the aggregation of gas-phase metal atoms for CO oxidation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Aggregate

Aggregate 2022年第6期3卷 137-147页

作者： Ilya V.Chepkasov Viktor S.Baidyshev artem A.Golubnichiy Ivan S.Zamulin Alexander G.Kvashnin Sergey M.Kozlov Skolkovo Institute of Science and Technology MoscowRussia Katanov Khakas State University AbakanRussia Department of Chemical and Biomolecular Engineering National University of SingaporeSingaporeSingapore

Alloy nanoparticles(nanoalloys)are widely applied in heterogeneous catalysts,advanced electrodes,biomaterials,and other *** properties of nanoalloys can be tuned to a significant extent by their structures and compositions,which are governed by the employed synthetic *** such synthesis occurs in nonequilibrium conditions and yields nanoalloys with structures and properties that are different from those obtained in thermodynamic *** this work,we characterize how the non-equilibrium conditions during the synthesis of Cu-Au alloys via physical vapor deposition(PVD)affect their morphology,composition,electronic structure,and reactivity in CO *** used molecular dynamics to simulate the PVD synthesis of Cu-Au nanoalloys through the non-isothermal aggregation of Cu and Au atoms at a 3:1 ratio in the Ar atmosphere to obtain realistic structures of Cu-Au *** to the different aggregation kinetics of Au and Cu atoms,the average Au concentration in the obtained Cu-Au particles varied between 14% and 50% depending on the nanoparticle size and the aggregation *** functional simulations revealed that the reactivity of the obtained Cu-Au clusters toward CO and oxygen as well as Brønsted-Evans-Polanyi relations for CO oxidation significantly depend on whether the clusters had fcc,icosahedral,or amorphous structures and do not strongly correlate with the d-band centers of the adsorption *** study highlights the importance of the non-equilibrium character of nanoalloy structure and composition for their electronic structure and catalytic *** performed analysis of the reactivity of Cu-Au clusters with realistic structures in CO oxidation will help the optimization of Cu-Au catalysts for this societally important reaction.

关键词： alloys catalysis molecular dynamics

eXawatt Center for Extreme Light Studies

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

High Power Laser Science and Engineering 2023年第6期11卷 101-129页

作者： Efim Khazanov Andrey Shaykin Igor Kostyukov Vladislav Ginzburg Ivan Mukhin Ivan Yakovlev Alexander Soloviev Ivan Kuznetsov Sergey Mironov artem Korzhimanov Denis Bulanov Ilya Shaikin Anton Kochetkov Alexey Kuzmin Mikhail Martyanov Vladimir Lozhkarev Mikhail Starodubtsev Alexander Litvak Alexander Sergeev Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences Nizhny Novgorod 603950Russia

The eXawatt Center for Extreme Light Studies project aimed to create a large scientific infrastructure based on lasers with giant peak *** project relies on the significant progress achieved in the last *** planned infrastructure will incorporate a unique light source with a pulse power of 600 PW using optical parametric chirped pulse amplification in large-aperture KD_(2)PO_(4),deuterated potassium dihydrogen phosphate *** interaction of such laser radiation with matter represents a completely new fundamental *** direct study of the space-time structure of vacuums and other unknown phenomena at the frontier of high-energy physics and the physics of superstrong fields will be *** applications will include the development of compact particle accelerators,the generation of ultrashort pulses of hard X-ray and gamma radiation for material science enabling one to probe material samples with unprecedented spatial and temporal resolution,the development of new radiation and particle sources,*** paper is translation from Russian[Kvantovaya Elektronika 53,95(2023)].

关键词： high-power femtosecond lasers interaction of ultrarelativistic field with matter

Change in the Pore Structure of Carbon-Carbon Composites during Successive Stages of High-Pressure Impregnation and Heat Treatment

在线全文

学校读者我要写书评

暂无评论

Journal of Chemistry and Chemical Engineering 2012年第12期6卷 1056-1060页

作者： Ekaterina V. Koganl Yury M. Volfkovich artem P. Malakho Valery V. Kulakov Anatoly M. Kenigfest Valentin E. Sosenkin Chemistry Department Moscow State University Moscow 119991 Russia Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of Science Moscow 119071 Russia OAO Rubin Aircraft Corporation Balashikha 143900 Russia

Pore structure of C/C （Carbon-Carbon） composite after several stages of pitch impregnation under the high pressure and heat treatment was investigated by means of low temperature nitrogen adsorption and the standard contact porosimetry. Total pore volume, pore size distribution and specific surface area were calculated for samples of composite after several successive stages of treatment. The radius of pores presented in the material changes from 1 nm to 90 tam. Total pore volume and specific surface area both decrease after successive stages of pitch impregnation under the pressure, whereas heat treatment up to 1,750 ℃ and 2,000 ℃ leads to creation of some porous space and pore volume expansion. The bulk porosity of C/C composite comes down from 33.7% to 13.7% after the serial stages of treatment and the specific surface area is reduced by half compared to the initial material.

关键词： Carbon-carbon composite pore structure total pore volume specific surface area high-pressure impregnation heattreatment.