超快激光诱导固体非热相变及其原子机理进展  

Recent Progress on Ultrafast Laser-Induced Solid Nonthermal Phase Transitions and Atomic Mechanisms

作　　者：陈念科 黄宇婷 李贤斌[1] 孙洪波[1,2] Chen Nianke;Huang Yuting;Li Xianbin;Sun Hongbo(State Key Laboratory of Integrated Optoelectronics,College of Electronic Science and Engineering,Jilin University,Changchun,Jilin 130012,China;State Key Laboratory of Precision Measurement Technology and Instruments,Department of Precision Instrument,Tsinghua University,Beijing 100084,China)

机构地区：[1]集成光电子学国家重点实验室,吉林大学电子科学与工程学院,吉林长春130012 [2]精密测试技术及仪器国家重点实验室,清华大学精密仪器系,北京100084

出　　处：《中国激光》2021年第2期3-12,共10页Chinese Journal of Lasers

基　　金：国家重点研发计划(2017YFB1104300);国家自然科学基金(61922035,11904118,11874171);中国博士后科学基金(2019M661200)。

摘　　要：激光诱导的相变是超短脉冲激光对材料进行加工改性的关键物理过程。由热效应驱动的光致相变通常都源于材料无序化,例如熔化或蒸发。在此情况下,光对材料原子尺度的控制力面临困难,加工改性的精度受限。而短脉冲的非热效应可以实现更高精度的相变控制,但是由于光与物质的相互作用过程复杂,相关机理仍在探索之中。介绍了近年来超短脉冲激光诱导非热相变的实验观测结果以及相应的机理研究进展,重点对比介绍了几种可以描述原子尺度机制的理论方法和超快激光在相变材料中诱导非热相变的动力学机理。最后讨论了理论机理对激光控制相变的参考意义。Significance Light-induced phase transition is a key process in material processing and property modification using an ultrafast laser.Phase transitions driven by thermal effects,such as melting and evaporation,disorder a material.As such,control of an atomic structure using a laser is still not good enough and limits the processing precision of the laser.In contrast,nonthermal effects of an ultrafast laser show great potential in the high-precision control of phase transitions.However,owing to the complex light-matter interaction processes,the mechanisms behind the transitions still need to be clarified.In recent years,many experimental studies of ultrafast laser-induced nonthermal phase transitions and their related mechanisms are reported.Several mechanisms,especially the atomic mechanisms,conflict with each other,which hinders the control and application of nonthermal phase transitions.Therefore,it is necessary to summarize the previous results to extract the key points and guide the development of ultrafast laser-induced nonthermal phase transitions.Progress Ultrafast laser-induced nonthermal melting of Si had been proposed as early as the 1970 s.A plasma annealing model in which the chemical bonding was softened by electronic excitation from bonding states to antibonding states was proposed to explain the abovementioned phenomenon.Then,the model was further improved using a tight-bonding model to quantitatively calculate the excitation induced instability.However,limited by the detection technology,nonthermal melting was not experimentally confirmed until 2001,when Rousse et al.demonstrated the ultrafast amorphization of InSb by time-resolved X-ray diffraction.In recent years,ultrafast laserinduced phase transitions in the phase-change memory(PCM)technology have attracted considerable attention owing to their interesting physics and promising applications in memory and computing technologies.For a long time,the mechanism of the ultrafast laser-induced amorphization of PCM materials was attributed to the the

关 键 词：超快光学 光与物质相互作用 非热相变 物理机制 第一性原理计算 

分 类 号：O469[理学—凝聚态物理]