Annular-Shaped Emission from Gallium Nitride Nanotube Lasers

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• 作者：Changyi Li ; Sheng Liu ; Antonio Hurtado ; Jeremy B. Wright ; Huiwen Xu ; Ting Shan Luk ; Jeffrey J. Figiel ; Igal Brener ; Steven R. J. Brueck ; George T. Wang
• 刊名：ACS Photonics
• 出版年：2015
• 出版时间：August 19, 2015
• 年：2015
• 卷：2
• 期：8
• 页码：1025-1029
• 全文大小：443K
• ISSN：2330-4022

文摘

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.