Search

Article

x

留言板

尊敬的读者、作者、审稿人, 关于本刊的投稿、审稿、编辑和出版的任何问题, 您可以本页添加留言。我们将尽快给您答复。谢谢您的支持!

姓名
邮箱
手机号码
标题
留言内容
验证码

Influence of long lifetime absorption process on the measurement of ultrafast carrier dynamics

Wang Wen-Fang Chen Ke Wu Jing-Da Wen Jin-Hui Lai Tian-Shu

Influence of long lifetime absorption process on the measurement of ultrafast carrier dynamics

Wang Wen-Fang, Chen Ke, Wu Jing-Da, Wen Jin-Hui, Lai Tian-Shu
PDF
Get Citation

(PLEASE TRANSLATE TO ENGLISH

BY GOOGLE TRANSLATE IF NEEDED.)

Metrics
  • Abstract views:  3663
  • PDF Downloads:  518
  • Cited By: 0
Publishing process
  • Received Date:  17 January 2011
  • Accepted Date:  24 February 2011
  • Published Online:  15 November 2011

Influence of long lifetime absorption process on the measurement of ultrafast carrier dynamics

  • 1. State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University,Guangzhou 510275,China

Abstract: The wavelength dependence of ultrafast relaxation dynamics of photoexcited carriers in bulk GaAs is studied using femtosecond time-resolved pump-probe transmission spectroscopy under the same photoexcited carrier concentration and the ratio of pump to probe in intensity. Negative and oscillating time-delayed signals are observed at central wavelengths of 760 nm and 780 nm and judged to be incorrect physically by comparson with a simulated computation result. It is found by waveform analysis that they are caused by the phase reversal of the output waveforms from a photodetector, while the phase reversal originates from a long lifetime absorption process existing in GaAs sample. It is pointed out that the phase reversal of the waveform can be corrected by raising the ratio of pump to probe in intensity at the photodetector, so that right transient traces can be obtained. However, raising the ratio is incompatible with the viewpoint that the scattered contribution to the photodetector from pump light should be filtered as much as possible. This result has an important reference value for the acquisition of correct ultrafast dynamics using time-resolved pump-probe spectroscopy.

Reference (31)

Catalog

    /

    返回文章
    返回