Abstract
ZnO micro-tetrapod microstructures were fabricated by a vapor phase transport method. Under the excitation of 325nm continuous wave He–Cd laser, the microphotoluminescence spectrum from a single ZnO micro-tetrapod presented a two-band structure with a series of optical resonance modes; a possible optical resonance loop formed in two adjacent legs of the tetrapod was suggested, and the two-band spectrum structure was attributed to the exciton–exciton scattering process. The lasing emission was obtained from single ZnO micro-tetrapod under intense excitation of 355nm nanosecond pulsed laser. The lasing spectrum shows clear mode structure with the lasing quality factor of 1300 and the lasing threshold of 150kW/cm2. The microphotoluminescence resonance and lasing results indicate that ZnO tetrapod can serve as a high-Q ultraviolet microcavity laser.
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