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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 37, Iss. 3 — Feb. 1, 2012
  • pp: 374–376

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

K. H. Li, Zetao Ma, and H. W. Choi  »View Author Affiliations

Optics Letters, Vol. 37, Issue 3, pp. 374-376 (2012)

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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 0.42MW/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.

© 2012 Optical Society of America

OCIS Codes
(140.4780) Lasers and laser optics : Optical resonators
(140.5960) Lasers and laser optics : Semiconductor lasers
(230.5750) Optical devices : Resonators
(140.3945) Lasers and laser optics : Microcavities
(220.4241) Optical design and fabrication : Nanostructure fabrication

ToC Category:
Lasers and Laser Optics

Original Manuscript: October 7, 2011
Revised Manuscript: November 23, 2011
Manuscript Accepted: December 9, 2011
Published: January 24, 2012

K. H. Li, Zetao Ma, and H. W. Choi, "Single-mode whispering gallery lasing from metal-clad GaN nanopillars," Opt. Lett. 37, 374-376 (2012)

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