Controlling polarization of vertical-cavity surface-emitting lasers using amorphous silicon subwavelength transmission gratings

1 July 1996

journal article
Published by AIP Publishing in Applied Physics Letters

Vol. 69 (1) , 7-9
https://doi.org/10.1063/1.118126

Abstract

Control of the polarization of vertical-cavity surface-emitting lasers (VCSELs) using a 240-nm-thick amorphous silicon subwavelength transmission grating (SWTG) is demonstrated. The grating, which has a strong polarization dependent reflectance and transmittance, was placed in front of the output window of a VCSEL. It was found that the SWTG can fix the VCSEL’s polarization in the direction perpendicular to the grating fingers, switch polarization directions, enhance the polarization ratio from 20:1 to over 200:1, and decrease the threshold current. Integration of these gratings into the VCSEL structure is discussed.

Keywords

VERTICAL CAVITY SURFACE EMITTING LASER

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