Room temperature ultraviolet GaN metal-coated nanorod laser

Yu Cheng Hsu, Kuok Pan Sou, Shih Pang Chang, Kung Shu Hsu, M. H. Shih, Hao-Chung Kuo, Chun Yen Chang, Yuh Jen Cheng

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Abstract

This study demonstrates a room-temperature ultraviolet GaN/Al nanorod (NR) metal laser with an optimized sidewall. A wet-chemical etching process with potassium hydroxide was used to control the GaN NR sidewall angle and polish the NR surface. The lasing action was observed near a wavelength of 365 nm with a low threshold power density of 5.2 mJ/cm2. The high-quality factor (Q) surface plasmon lasing modes were characterized with experiments and three-dimensional finite-element method simulations. We also studied the optical modes in GaN metal-coated NR with and without an Al layer and verified the metal layer is necessary for high-Q resonant modes.

Original languageEnglish
Article number191102
JournalApplied Physics Letters
Volume103
Issue number19
DOIs
StatePublished - 4 Nov 2013

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