Pump probe measurement of electron spin relaxation time in (110)-oriented gaas/algaas multiple quantum well microposts

Nobuhide Yokota, Yoshihiro Tsunemi, Kazuhiro Ikeda, Hitoshi Kawaguchi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We measured the electron spin relaxation time ts in (110)-oriented GaAs/AlGaAs multiple quantum well microposts using a pump probe technique with a time resolution of 1.3 ps. A long ts of 0.74 ns was obtained even for 0.5 -m posts in which the carrier lifetime ° was drastically shortened to 27 ps. Such long ts and short ° are suitable for fast switching of lasing circular polarizations in vertical-cavity surface-emitting lasers (VCSELs). Our rate equation analysis revealed that a ts much longer than the ° obtained in the measurement does not limit the switching speed of lasing circular polarizations in (110)-VCSELs.

Original languageEnglish
Article number122401
JournalApplied Physics Express
Volume5
Issue number12
DOIs
Publication statusPublished - 2012 Dec 1
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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