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 language | English |
---|---|
Pages (from-to) | 1025-1029 |
Number of pages | 5 |
Journal | ACS Photonics |
Volume | 2 |
Issue number | 8 |
Early online date | 13 Jul 2015 |
DOIs | |
Publication status | Published - 1 Aug 2015 |
Keywords
- gallium nitride nanotubes
- spectral linewidth
- optical nanofluid
- laser
- GaN
- annular emission