Single-mode whispering gallery lasing from metal-clad GaN nanopillars

Opt Lett. 2012 Feb 1;37(3):374-6. doi: 10.1364/OL.37.000374.

Abstract

An ordered hexagonal closed-packed nanopillar array is fabricated on GaN. A metal coating is then applied to encapsulate the pillars for promoting optical confinement within the cylindrical cavity. Room-temperature lasing at 373 nm is observed under pulsed excitation, at a lasing threshold of 0.42 MW/cm2. With pillar diameters of around 980 nm, the number of modes overlapping the emission spectrum is reduced, giving rise to single-mode whispering gallery stimulated emission. Finite-difference time-domain simulations are carried out for the prediction of resonant frequencies and electric field patterns corresponding to the resonant modes.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Gallium / chemistry*
  • Lasers*
  • Metals / chemistry*
  • Nanostructures / chemistry*
  • Nanotechnology / methods*
  • Silicon Dioxide / chemistry

Substances

  • Metals
  • Silicon Dioxide
  • Gallium
  • gallium nitrate