Work

Room temperature spin injection into commercial VCSELs at non-resonant wavelengths

Year: 2025

Type: article

Abstract: Spin lasers leverage electron spin-polarisation to control photon polarisation, offering the potential for lower thresholds, rapid modulation, and all-optical data processing. We report successful spin injection into a commercial vertical cavity surface emitting laser (VCSEL) using optical pumping at wavelengths of 794 nm and 810 nm. Maximum circular polarisation achieved was about 20% at 794 nm, whereas this falls to 5% with exciting at 810 nm. We attribute this to reduced spin injection due to the longer excitation wavelength in line with previous measurements on quantum wells under optical orientation. We extend the spin-flip model to account for realistic excitation conditions and find our theoretical analysis accurately reproduces experimental trends, surveying spin injection in commercial VCSELs.

Source: Semiconductor Science and Technology

DOI: 10.1088/1361-6641/ae1e26

Authors: Timur Almabetov, Petros Androvitsaneas, Zhongze Ren, Andrew Young, Ruth Oulton, Edmund Harbord

Institution: University of Bristol

Language: English

Topic: Semiconductor Lasers and Optical Devices

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,325

Funders: University of Bristol, Engineering and Physical Sciences Research Council