Ultrafast Electron Dynamics in Gold Films Probed by Near-infrared Femtosecond Laser

Qiong-qiong ZHAO; Wei YUAN; Juan DU; Guo-hong MA; Yu-xin LENG

doi:10.37188/CJL.20210262

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Ultrafast Electron Dynamics in Gold Films Probed by Near-infrared Femtosecond Laser

Synthesis and Properties of Materials | 更新时间：2021-11-23

- Ultrafast Electron Dynamics in Gold Films Probed by Near-infrared Femtosecond Laser
  增强出版
- Chinese Journal of Luminescence Vol. 42, Issue 11, Pages: 1787-1794(2021)
- 作者机构：
  
  1.上海大学　理学院，上海　200444
  2.中国科学院上海光学精密机械研究所　强场激光物理国家重点实验室，上海　201800
- 作者简介：
- 基金信息：
  
  National Key R&D Program of China(2017YFE0123700);National Natural Science Foundation of China(61925507;61875211;61905264);CAS Interdisciplinary Innovation Team
- DOI：10.37188/CJL.20210262
  CLC： O482.31
- Published：01 November 2021，
  
  Received：05 August 2021，
  
  Revised：30 August 2021，
扫描看全文
Qiong-qiong ZHAO, Wei YUAN, Juan DU, et al. Ultrafast Electron Dynamics in Gold Films Probed by Near-infrared Femtosecond Laser. [J]. Chinese Journal of Luminescence 42(11):1787-1794(2021)
DOI：

Qiong-qiong ZHAO, Wei YUAN, Juan DU, et al. Ultrafast Electron Dynamics in Gold Films Probed by Near-infrared Femtosecond Laser. [J]. Chinese Journal of Luminescence 42(11):1787-1794(2021) DOI： 10.37188/CJL.20210262.

摘要

利用超快泵浦探测技术，研究了近红外飞秒强激光脉冲作用下，金膜中的超快电子动力学过程。研究发现，800 nm飞秒激光激发后，金膜的瞬态反射率存在一个下降过程。通过对金膜的瞬态反射率光谱进行分析和模拟，发现主要是自由电子弛豫和带间双光子跃迁这两种电子动力学过程综合作用的结果。利用双温模型，模拟了800 nm飞秒激光作用下金膜的温度弛豫和瞬态反射率变化过程，理论计算结果与实验结果符合良好。

Abstract

Using ultrafast pump-probe technology

the ultrafast electron dynamics in gold films are investigated by near-infrared femtosecond laser. Transient reflectivity decrease after the 800 nm femtosecond laser excitation is observed. By analyzing and simulating the transient reflectivity spectrum difference

we found that it is mainly the result from the combined action of two kinds of electron dynamics: free electron relaxation and interband two-photon transitions. The two-temperature model is used to simulate the temperature relaxation and transient reflectivity difference

and the simulated results are in good agreement with the experimental results.

关键词

泵浦探测技术近红外飞秒激光金膜超快电子动力学瞬态反射率

Keywords

pump-probe technologynear-infrared femtosecond lasergold filmultrafast electron dynamicstransient reflectivity

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Related Institution

Department of Physics， Shanghai University

State Key Laboratory of High Field Laser Physics， Shanghai Institute of Optics and Fine Mechanics（SIOM）， Chinese Academy of Sciences（CAS）

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