Abstract
A whispering gallery mode optical resonator has been achieved using individual ZnO micro- and nanocolumns. Monochromatic cathodoluminescence images of the ZnO micro- and nanocolumns show that enhanced luminescence intensity is located across the profile of the micro- and nanocolumns, and is mainly attributed to the whispering gallery mode (WGM) enhanced emission. The individual hexagonal ZnO micro- and nanocolumns are regarded as an optical resonator structure. Theoretical calculations and computer simulations based on the finite-difference time-domain suggest that the WGMs are generated in the ZnO micro- and nanocolumns, and these results agree closely with the experimental results.
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