Monolithically multi-color lasing from an InGaN microdisk on a Si substrate

M. Athanasiou, R. M. Smith, J. Pugh, Y. Gong, M. J. Cryan, T. Wang*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

7 Citations (Scopus)
266 Downloads (Pure)

Abstract

An optically pumped multi-color laser has been achieved using an InGaN/GaN based micro-disk with an undercut structure on a silicon substrate. The micro-disk laser has been fabricated by means of a combination of a cost-effective microsphere lithography technique and subsequent dry/wet etching processes. The microdisk laser is approximately 1 μm in diameter. The structure was designed in such a way that the vertical components of the whispering gallery (WG) modes formed can be effectively suppressed. Consequently, three clean lasing peaks at 442 nm, 493 nm and 522 nm have been achieved at room temperature by simply using a continuous-wave diode laser as an optical pumping source. Time-resolved micro photoluminescence (PL) measurements have been performed in order to further confirm the lasing by investigating the excitonic recombination dynamics of these lasing peaks. A three dimensional finite-difference-time-domain (FDTD) simulation has been used for the structure design.

Original languageEnglish
Article number10086
JournalScientific Reports
Volume7
Issue number1
Early online date30 Aug 2017
DOIs
Publication statusPublished - 1 Dec 2017

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