Annular-shaped emission from gallium nitride nanotube lasers

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

Research output: Contribution to journalArticle

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Abstract

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.
Original languageEnglish
Pages (from-to)1025-1029
Number of pages5
JournalACS Photonics
Volume2
Issue number8
Early online date13 Jul 2015
DOIs
Publication statusPublished - 1 Aug 2015

Keywords

  • gallium nitride nanotubes
  • spectral linewidth
  • optical nanofluid
  • laser
  • GaN
  • annular emission

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