2005•Journal of Applied PhysicsRequires access

Stimulated emission and lasing of random-growth oriented ZnO nanowires

Hsu‐Cheng Hsu, Chunyi Wu, Wen–Feng Hsieh

Abstract

We report room-temperature ultraviolet stimulated emission and lasing from optically pumped high-quality ZnO nanowires. Emission due to the exciton-exciton scattering process shows apparent stimulated-emission behavior. Several sharp peaks associated with random laser action are seen under high pumping intensity. The mechanism of laser emission is attributed to coherent multiple scattering among the random-growth oriented nanowires. The characteristic cavity length is determined by the Fourier transform of the lasing spectrum.

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Key concepts: Lasing threshold, Random laser, Nanowire, Exciton, Materials science, Gain-switching, Stimulated emission, Laser