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.
ASJC Scopus subject areas
- Physics and Astronomy(all)