Optical characterisation of InGaN-based microdisk arrays with nanoporous GaN/GaN DBRs

Autor:	Peter Fletcher, Guillem Martínez de Arriba, Ye Tian, Nicolas Poyiatzis, Chenqi Zhu, Peng Feng, Jie Bai, Tao Wang
Rok vydání:	2022
Předmět:	Acoustics and Ultrasonics Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials
Zdroj:	Journal of Physics D: Applied Physics. 55:464001
ISSN:	1361-6463 0022-3727
Popis:	Optically pumped whispering gallery mode (WGM) lasing has been observed in many freestanding microdisk structures. Dry etching is normally used to fabricate the microdisks, which causes severe sidewall damage, resulting in degradation of lasing performance, especially for ultra-small electrically-injected devices. In this paper, we demonstrate high quality microdisk cavities with 3.5 µm diameter, by combining a selective overgrowth approach and an epitaxial lattice-matched distributed Bragg reflector (DBR), topped with a highly reflective (>99%) dielectric DBR. InGaN polaritons are found to occur in the high-quality microcavities. WGM modes are measured, with the positions in good agreement with finite difference time domain simulations. Furthermore, lasing behaviour is observed with a threshold at 410 µW and a dominant mode at 488 nm.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e0f70e5abac755d0a1032a549d1db873 https://doi.org/10.1088/1361-6463/ac8fa0 Zobrazit plný text záznamu