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Pump Probe Measurement of Electron Spin Relaxation Time in (110)-Oriented GaAs/AlGaAs Multiple Quantum Well Microposts

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