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

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??m 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.

SUBMITTER: Athanasiou M

PROVIDER: S-EPMC5577231 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature

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

Athanasiou M M Smith R M RM Pugh J J Gong Y Y Cryan M J MJ Wang T T

Scientific reports 20170830 1

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 suppre ...[more]

PMID: 28855663

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