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Gold substrate-induced single-mode lasing of GaN nanowires

Xu, Huiwen and Wright, Jeremy B. and Hurtado, Antonio and Li, Qiming and Luk, Ting Shan and Figiel, Jeffrey J. and Cross, Karen and Balakrishnan, Ganesh and Lester, Luke F. and Brener, Igal and Wang, George T. (2012) Gold substrate-induced single-mode lasing of GaN nanowires. Applied Physics Letters, 101 (22). ISSN 0003-6951

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We demonstrate a method for mode-selection by coupling a GaN nanowire laser to an underlying gold substrate. Multimode lasing of GaN nanowires is converted to single-mode behavior following placement onto a gold film. A mode-dependent loss is generated by the absorbing substrate to suppress multiple transverse-mode operation with a concomitant increase in lasing threshold of only ∼13. This method provides greater flexibility in realizing practical single-mode nanowire lasers and offers insight into the design of metal-contacted nanoscale optoelectronics.