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

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

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Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong, China.


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.

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