Demonstration of polarization control GaN-based micro-cavity lasers using a rigid high-contrast grating reflector

Tsu Chi Chang, Kuo Bin Hong, Shuo Yi Kuo, Tien-Chang Lu

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

We reported on GaN microcavity (MC) lasers combined with one rigid TiO2 high-contrast grating (HCG) structure as the output mirror. The HCG structure was directly fabricated on the GaN structure without an airgap. The entire MC structure comprised a bottom dielectric distributed Bragg reflector; a GaN cavity; and a top HCG reflector, which was designed to yield high reflectance for transverse magnetic (TM)- or transverse electric (TE)-polarized light. The MC device revealed an operation threshold of approximately 0.79 MW/cm2 when pulsed optical pumping was conducted using the HCG structure at room temperature. The laser emission was TM polarized with a degree of polarization of 99.2% and had a small divergence angle of 14° (full width at half maximum). This laser operation demonstration for the GaN-based MC structure employing an HCG exhibited the advantages of HCGs in semiconductor lasers at wavelengths from green to ultraviolet.

Original languageEnglish
Article number13055
Pages (from-to)1-6
Number of pages6
JournalScientific reports
Volume9
Issue number1
DOIs
StatePublished - 10 Sep 2019

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