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

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

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 M...

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Bibliographic Details
Published in:Optics letters Vol. 37; no. 3; p. 374
Main Authors: Li, K H, Ma, Zetao, Choi, H W
Format: Journal Article
Language:English
Published: United States 01-02-2012
Subjects:
Gallium - chemistry
Lasers
Metals - chemistry
Nanostructures - chemistry
Nanotechnology - methods
Silicon Dioxide - chemistry
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Summary: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.
ISSN:1539-4794
DOI:10.1364/ol.37.000374