Polarization control ofGaN-based micro-caivty lasers with top high-contrast grating reflectors

Tsu Chi Chang, Kuo Bin Hong, Shiou Yi Kuo, Tien Chang Lu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


We reported on GaN micro-cavity (MC) lasers combining one rigid TiO2 high-contrast grating (HCG) structure as the output mirror. HCG structure was made directly on the GaN without an airgap, designed to yield high reflectance for transverse magnetic (TM) or transverse electric (TE) polarized light. The laser emission was TM polarized with a degree of polarization of 99.2% and had a small divergence angle of 14 degrees (full width at half maximum), under pulsed optical pumping at room temperature. This demonstration of laser operation for the GaN-based MC with an HCG fully exhibited advantages of HCGs for applications in semiconductor lasers at the wavelength from green to ultraviolet regimes.

Original languageEnglish
Title of host publicationMOC 2019 - 24th Microoptics Conference
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages2
ISBN (Electronic)9784863487123
StatePublished - Nov 2019
Event24th Microoptics Conference, MOC 2019 - Toyama, Japan
Duration: 17 Nov 201920 Nov 2019

Publication series

NameMOC 2019 - 24th Microoptics Conference


Conference24th Microoptics Conference, MOC 2019

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