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Annular-shaped emission from gallium nitride nanotube lasers

Li, Changyi and Liu, Sheng and Hurtado, Antonio and Wright, Jeremy B. and Xu, Huiwen and Luk, Ting Shan and Figiel, Jeffrey J. and Brener, Igal and Brueck, Steven R. J. and Wang, George T. (2015) Annular-shaped emission from gallium nitride nanotube lasers. ACS Photonics, 2 (8). pp. 1025-1029. ISSN 2330-4022

Text (Li-etal-ACSP-2015-Annular-shaped-emission-from-gallium-nitride)
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Annular-shaped lasing emission is demonstrated from gallium nitride nanotubes fabricated using a two-step top-down technique. By optically pumping, we observe a clear threshold of 1055 kW/cm2, a narrow spectral linewidth of 0.19 nm, and guided emission from the nanotubes. Lasing is also demonstrated in a liquid environment, with an approximate doubling in threshold observed. The nanotube lasers could be of interest for optical nanofluidic applications or applications benefiting from a hollow beam shape. More generally, the results indicate that cross-sectional shape control can be employed to manipulate the properties of nanolasers.