(110)-oriented GaAs/AlGaAs multiple quantum well microposts for high-speed polarization switching of spin-controlled VCSELs

N. Yokota, K. Ikeda, H. Kawaguchi

Research output: Contribution to conferencePaperpeer-review

Abstract

Spin-controlled vertical-cavity surface-emitting lasers (VCSELs) have several beneficial features, such as threshold reduction and circularly polarized lasing. We previously demonstrated 1-GHz switching between lasing circular polarizations with two opposite directions in a VCSEL based on a (110)-oriented multiple quantum well (MQW) with a degree of circular polarization higher than 0.9 [1]. Shortening the carrier lifetime τc while preserving the electron spin relaxation time τs is a straightforward solution to switching the lasing circular polarizations faster since residual electrons in the MQW deteriorate the degree of spin polarization. We therefore introduced micropost structures in a (110)-MQW. However, we could not measure τs in microposts smaller than 2 μm due to the time resolution of the streak camera (∼25 ps) [2]. Although use of the microposts with a fast non-radiative surface recombination is a promising approach for faster polarization switching in spin-controlled VCSELs, it is still unclear if τs in useful post sizes smaller than 2 μm can be kept long. In this work, we measured τc and τs in (110) GaAs/AlGaAs MQW microposts with special attention to those smaller than 2 μm using a pump probe-based time-resolved Kerr rotation (TRKR) technique. We also report the results of rate equation analysis in a micropost VCSEL using the measured τc and τs.

Original languageEnglish
DOIs
Publication statusPublished - 2013 Jan 1
Externally publishedYes
Event2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC 2013 - Munich, Germany
Duration: 2013 May 122013 May 16

Conference

Conference2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC 2013
CountryGermany
CityMunich
Period13/5/1213/5/16

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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