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Rapid and high precision measurement of opto-thermal relaxation with pump-probe method

Science Bulletin 2018年第5期63卷 287-292页

作者： Tao Wang Xiao-Fei Liu Yunqi Hu Guoqing Qin Dong Ruan Gui-Lu Long State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua University Beijing 100084 China School of Science and the State Key Laboratory of Information photonics and Optical communications Beijing University of Posts and Telecommunications Beijing 100876 China Collaborative Innovation Centre of Quantum Matter Beijing 100084 China Tsinghua National Laboratoly of Information Science and Technology Beijing 100084 China

Opto-thermal relaxation is one of the most important properties of nonlinear optical *** and high precision measurement of this parameter is vital in both fundamental research and *** measurement uses either complicated structure with poor precision or high power heating source with low ***,we propose a pump-probe method(PPM) to optically measure the thermal relaxation using whispering gallery mode(WGM) *** the pump laser shines on a microcavity,the materials absorb the input power resonantly and heat *** the heat dissipates from the cavities to the *** opto-thermal effect induces a refractive index change reflected in the signal light transmission *** analyzing the curve character of the transmission spectra of the signal response in the spontaneous relaxation process,the thermal relaxation time can be rapidly measured with high ***,we systematically verify the PPM using microtoroids under various pump powers and at various locking points of the signal laser *** small rate of refractive index changes($10à8) can be discerned with an input pump power as low as 11.816 l ***,the PPM can be used to detect refractive index perturbation,like gas or liquid sensing,temperature fluctuations with ultra-high sensitivity and be applied to optical materials analysis efficiently.

关键词： Microcavities Opto-thermal effect Optical materials Thermal relaxation Sensing pump-probe

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共振和非共振超快pump-probe偏振光谱理论研究

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中国科学（B辑） 1997年第3期27卷 246-253页

作者：赵仪何国钟中国科学院大连化学物理研究所分子反应动力学国家重点实验室大连116023

从相互作用表象Liouville方程出发,得出了任意偏振激光作用下分子系统在时间域内的四阶张量非线性响应函数.处理了分子电子基态核相干运动的pump-probe偏振光谱,给出了在共振、非共振条件下光谱信号的明晰表达式.在基态核转动相干时,利... 详细信息

从相互作用表象Liouville方程出发,得出了任意偏振激光作用下分子系统在时间域内的四阶张量非线性响应函数.处理了分子电子基态核相干运动的pump-probe偏振光谱,给出了在共振、非共振条件下光谱信号的明晰表达式.在基态核转动相干时,利用球张量代数使分子固有响应和激光偏振因素分离。

关键词：非线性响应函数 pump-probe 偏振光谱转动相干

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Opto-electromechanically induced transparency in a hybrid opto-electromechanical system

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Chinese Physics B 2019年第10期28卷 579-584页

作者： Hui Liu Li-Guo Qin Li-Jun Tian Hong-Yang Ma Department of Physics Shanghai UniversityShanghai 200444China School of Mathematics Physics and StatisticsShanghai University of Engineering ScienceShanghai 201620China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China School of Science Qingdao University of TechnologyQingdao 266000China

We study opto-electromechanically induced transparency in a hybrid opto-electromechanical system made up of an optical cavity tunneling-coupled to an opto-mechanical cavity, which is capacitively coupled to a charged mechanical oscillator by a charged and moveable mechanical cavity mirror as an interface. By studying the effects of the different parameters on the output field, we propose a scheme to modulate the opto-electromechanically induced transparency(OEMIT). Our results show that the OEMIT with the transparency windows from single to double to triple can be modulated by changing the tunneling, opto-mechanical and electrical couplings. In addition, the explanation of the OEMIT with multi-windows is given by the energy level diagram based on quantum interference. Our investigation will provide an optimal platform to manipulate the transmission of optical field via microfabricated opto-electromechanical device.

关键词： opto-electromechanical system opto-electromechanically induced transparency pump-probe spectroscopy

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Attosecond laser station

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Chinese Physics B 2018年第7期27卷 50-65页

作者： Hao Teng Xin-Kui He Kun Zhao Zhi-Yi Wei Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Science University of Chinese Academy of SciencesBeijing 100049China

The attosecond laser station （ALS） at the Synergetic Extreme Condition User Facility （SECUF） is a sophisticated and user-friendly platform for the investigation of the electron dynamics in atoms, molecules, and condensed matter on timescales ranging from tens of femtoseconds to tens of attoseconds. Short and tunable coherent extreme-ultraviolet （XUV） light sources based on high-order harmonic generation in atomic gases are being developed to drive a variety of endstations for inspecting and controlling ultrafast electron dynamics in real time. The combination of such light sources and end-stations offers a route to investigate fundamental physical processes in atoms, molecules, and condensed matter. The ALS consists of four beamlines, each containing a light source designed specifically for application experiments that will be performed in its own end-station. The first beamline will produce broadband XUV light for attosecond photoelectron spectroscopy and attosecond transient absorption spectroscopy. It is also capable of performing attosecond streaking to characterize isolated attosecond pulses and will allow studies on the electron dynamics in atoms, moleculars, and condensed matter. The second XUV beamline will produce narrowband femtoseeond XUV pulses for time-resolved and angle-resolved photoelectron spectroscopy, to study the electronic dynamics on the timescale of fundamental correlations and interactions in solids, especially in superconductors and topological insulators. The third beamline will produce broadband XUV pulses for attosecond coincidence spectroscopy in a cold-target recoil-ion momentum spectrometer, to study the ultrafast dynamics and reactions in atomic and molecular systems. The last beamline produces broadband attosecond XUV pulses designed for time-resolved photoemission electron microscopy, to study the ultrafast dynamics of plasmons in nanostructures and the surfaces of solid materials with high temporal and spatial resolutions simultane

关键词： attosecond extreme-ultraviolet (XUV) pulse pump-probe photoemission spectroscopy

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The unique magnetic damping enhancement in epitaxial Co2Fe1-xMnxAl films

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Chinese Physics B 2019年第9期28卷 332-337页

作者： Shu-Fa Li Chu-Yuan Cheng Kang-Kang Meng Chun-Lei Chen College of Electronics and Information Engineering Guangdong Ocean UniversityZhanjiang 524000China State-Key Laboratory of Optoelectronic Materials and Technologies School of PhysicsSun Yat-Sen UniversityGuangzhou 510275China State Key Laboratory for Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China

Uniform precession dynamics and its magnetic damping are investigated in epitaxial Co2Fe1-xMnxAl films by using the time-resolved magneto-optical Kerr effect under out-of-plane *** decay time of uniform precession mode decreases, and thus the magnetic damping increases with the increase of external ***, the decay time decreases as x decreases, so that the enhancement of magnetic damping occurs in Fe-rich ***, the decay time decreases as the excitation fluence increases, which drops rapidly at low magnetic field comparing with the slow reduction at high magnetic *** unique magnetic damping enhancement is attributed to the enhancement of homogeneous magnetization.

关键词： ultrafast dynamics pump-probe magnetic damping Heusler alloy

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Harnessing wrinkling morphologies of graphene on soft substrates for mechanically programmable interfacial thermal conductance

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Nano Research 2023年第7期16卷 9608-9617页

作者： Qingchang Liu Baoxing Xu Department of Mechanical and Aerospace Engineering University of VirginiaCharlottesvilleVirginia 22904USA

Strain engineering has been leveraged to tune the thermal properties of materials by introducing stress and manipulating local atomic vibrations,which poses a detrimental threat to the mechanical integrity of materials and structures and limits the capability to regulate thermal ***,we report that the interfacial thermal conductance of graphene on a soft substrate can be regulated by harnessing wrinkling and folding morphologies of graphene,which could be well controlled by managing the prestrain applied to the *** obtained graphene structures are free of significant in-plane mechanical strain and only have infinitesimal distortion to the intrinsic thermal properties of *** subsequent thermal transport studies with pumpprobe non-equilibrium molecular dynamics(MD)simulation show that the thermal conductance between graphene structures and the substrate is uniquely determined by the morphological features of *** atomic density of interfacial interactions,energy dissipation,and temperature distribution are elucidated to understand the thermal transport across each graphene structure and *** further demonstrate that the normalized thermal conductance decreases monotonically with the increase of the equivalent mechanical strain,showing the capability of mechanically programmable interfacial thermal conductance in a broad range of *** demonstrations in search of on-demand thermal conductance are conducted by controlling the geometric morphologies of *** study lays a foundation for regulating interfacial thermal conductance through mechanical loading-induced geometric deformation of materials on a soft substrate,potentially useful in the design of flexible and stretchable structures and devices with tunable thermal management performance.

关键词： interfacial thermal conductance wrinkled graphene pump-probe atomic interaction mechanical loading

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Dynamics of excited m-dichlorobenzene

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Science China Chemistry 2004年第4期47卷 283-288页

作者： YUAN Liwei WANG Yanqiu WANG Li BAI Jiling HE Guozhong State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China

Dynamics of excited m-dichlorobenzene is investigated in real time by femtosecond pump-probe method, combined with time-of-flight mass spectrometric detection in a supersonic molecular beam. The yields of the parent ion and daughter ion C6H4Cl+ are examined as a func-tion of the delay between the 270 and 810 nm femtosecond laser pulses, respectively. The life-time of the first singlet excited state S1 of m-dichlorobenzene is measured. The origin of this daughter ion C6H4Cl+ is discussed. The ladder mechanism is proposed to form the fragment ion. In addition, our experimental results exhibit a rapid damped sinusoidal oscillation over interme-diate time delays, which is due to quantum beat effects.

关键词： femtosecond lifetime of excited state pump-probe ionization-dissociation quantum beat

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Study on wave packet dynamics of E^1Σ_g^+ state of Li_2 with femtosecond-resolved photoelectron spectra

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Chinese Physics B 2010年第3期19卷 269-273页

作者：刘玉芳刘瑞琼丁俊霞 Department of Physics Henan Normal University

Wave packet dynamics of the Li2 molecule are investigated by using the time-dependent quantum wave packet method, and the time-resolved photoelectron spectra of the Li2 molecule are calculated. The time-resolved wave packet theory is used to reasonably interpret the phenomena of the photoelectron spectra for different parameters. Our calculation shows that the loss of the wave packets in the shelf state area of E1∑g＋ plays a prominent role in the process of photoionization with the increase of the delay time. Moreover, the oscillation of the wave packet on the E1∑g＋ curve symbolizes a decreasing process of energy.

关键词： time-dependent wave packet photoelectron spectra pump-probe

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Intra-acceptor hole relaxation in Be δ-doped GaAs/AlAs multiple quantum wells

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Chinese Physics B 2009年第9期18卷 3975-3979页

作者：李素梅郑卫民宋迎新刘静初宁宁 School of Space Science and Physics Shandong University at Weihai School of Information Engineering Shandong University at Weihai

This paper studies the dynamics of intra-acceptor hole relaxation in Be δ-doped GaAs/AlAs multiple quantum wells （MQW） with doping at the centre by time-resolved pump-probe spectroscopy using a picosecond free electron laser for infrared experiments. Low temperature far-infrared absorption measurements clearly show three principal absorption lines due to transitions of the Be acceptor from the ground state to the first three odd-parity excited states respectively. The pump-probe experiments are performed at different temperatures and different pump pulse wavelengths. The hole relaxation time from 2p excited state to ls ground state in MQW is found to be much shorter than that in bulk GaAs, and shown to be independent of temperature but strongly dependent on wavelength. The zone-folded acoustic phonon emission and slower decay of the wavefunctions of impurity states are suggested to account for the reduction of the 2p excited state lifetime in MQW. The wavelength dependence of the 2p lifetime is attributed to the diffusion of the Be atom δ-layer in quantum wells.

关键词： carrier relaxation multiple quantum well intra-acceptor dynamics pump-probe

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Picosecond time-resolved X-ray ferromagnetic resonance measurements at Shanghai synchrotron radiation facility

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Nuclear Science and Techniques 2022年第5期33卷 126-134页

作者： Xia Yang Jie-Feng Cao Jun-Qin Li Fang-Yuan Zhu Rui Yu Jian He Zi-Long Zhao Yong Wang Ren-Zhong Tai Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China

An experimental picosecond time-resolved X-ray ferromagnetic resonance(TR-XFMR)apparatus with a time resolution of 13 ps(RMS)or 31 ps(FWHM)was constructed and demonstrated in the 07U and 08U1A soft X-ray beamlines at the Shanghai Synchrotron Radiation Facility(SSRF)using pump-probe detection and X-ray magnetic circular dichroism(XMCD)*** and time-resolved ferromagnetic resonance was excited by continuous microwave phase-locking of the bunch clock within the photon beam during synchrotron radiation and was characterized by detecting the magnetic circular dichroism signals of the elements of interest in the magnetic *** this equipment,we measured the amplitude of the element-specific moment precession during ferromagnetic resonance(FMR)at 2 GHz in a single Ni81Fe19layer.

关键词： Ferromagnetic resonance Time resolution pump-probe Synchrotron radiation

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