激光与半导体材料相互作用的双电子共振吸收模型  

Two-electron resonance absorption model of laser-semiconductor interaction

作　　者：秦可勉 潘玉贺 茆亚南 安恒[2] 张晨光[2] 赵江涛[1] 王铁山[1] 彭海波[1] Qin Kemian;Pan Yuhe;Mao Ya’nan;An Heng;Zhang Chenguang;Zhao Jiangtao;Wang Tieshan;Peng Haibo(School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China;Lanzhou Institute of Physics,Lanzhou 730000,China)

机构地区：[1]兰州大学核科学与技术学院,兰州730000 [2]兰州空间技术物理研究所,兰州730000

出　　处：《强激光与粒子束》2023年第9期129-135,共7页High Power Laser and Particle Beams

基　　金：国防科技重点实验室基金项目(142910190110);甘肃省科技重大专项(22ZD6GA011)。

摘　　要：通过提出双电子共振吸收模型,解释了激光与半导体材料相互作用时材料吸收光子的物理机制,分析了温度、掺杂数密度对吸收系数的影响;结合热峰模型,将激光的能量注入视为热源,计算出了激光入射时材料中电子温度的时空演化,通过费米狄拉克分布计算出自由电荷数密度分布,得到了电荷激发过程的计算模型,模拟了激光诱发单粒子翻转的过程。模拟结果表明,激光能量与激发电荷总量的关系是非线性的,这意味着激光能量与粒子的线性能量传输之间为非线性对应关系,与实验结果相符。This work proposes a two-electron resonance absorption(TERA)model,which explains the reasonfor laser-induced single event upset(SEU):when the energy of a single photon is not enough to excite the electron-hole pair,there will be de-excitation from a free-electron with higher energy in the conduction band to provide extraenergy to excite the electrons in the valence band to the conductive band.This model can explain the physicalmechanism of the material’s absorption of photons in the laser-semiconductor material interaction and explain theeffect of the ambient temperature and doping concentration of the material on the absorption coefficient through theimportance of the concentration of high-energy electrons in the conduction band for TERA.In our simulation,we uselaser as the energy source for the thermal spike model,and the spatial-temporal evolution of the electronic temperaturein the material during the laser radiation is simulated.Therefore,the change in absorption coefficient can be explainedby the TERA.Moreover,according to the Fermi-Dirac distribution,the free charge density is calculated by theelectronic temperature of the material.Furthermore,the accumulated free charge induced by laser radiation is given bythe integration over the whole volume of the material.Thus,the numerical solution of the charge excitation process isobtained,through which the total amount of excitation charge when the laser induces SEU can be calculated.Thesimulation results show that the relationship between laser energy and the total excitation charge is nonlinear,i.e.,there is a nonlinear correspondence between laser energy and the linear energy transport of particles,which isconsistent with the experimental results.

关 键 词：脉冲激光 双电子共振吸收模型 热峰模型 单粒子效应 

分 类 号：TN386.1[电子电信—物理电子学]