Omnidirectional whispering-gallery-mode lasing in GaN microdisk obtained by selective area growth on sapphire substrate

Jie’an Jiang, Houqiang Xu, Moheb Sheikhi, Liang Li, Zhenhai Yang, Jason Hoo, Shiping Guo, Yuheng Zeng, Wei Guo, Jichun Ye

Research output: Journal PublicationArticlepeer-review

7 Citations (Scopus)
1 Downloads (Pure)

Abstract

The optical properties of hexagonal GaN microdisk arrays grown on sapphire substrates by selective area growth (SAG) technique were investigated both experimentally and theoretically. Whispering-gallery-mode (WGM) lasing is observed from various directions of the GaN pyramids collected at room temperature, with the dominant lasing mode being Transverse-Electric (TE) polarized. A relaxation of compressive strain in the lateral overgrown region of the GaN microdisk is illustrated by photoluminescence (PL) mapping and Raman spectroscopy. A strong correlation between the crystalline quality and lasing behavior of the GaN microdisks was also demonstrated.
Original languageEnglish
Pages (from-to)16195-16205
JournalOptics Express
Volume27
Issue number11
DOIs
Publication statusPublished - 27 May 2019

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