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Strongly enhanced luminescence was observed from an individual hexagonal ZnO nanocolumn using the monochromatic cathodeluminescence equipment attached at a scanning electron microscopy. The intense luminescence emissions are focused on two regions, i.e., the profile and the center of the nanocolumn, respectively. The luminescence from the center region is attributed to the Fabry–Pérot (FP) mode enhanced emission, and the one from the hexagonal profile is attributed to the whispering gallery (WG) mode enhanced emission when the individual ZnO nanocolumn is regarded as an optical resonator. The FP enhanced emission is much stronger than the WG enhanced one.
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Wang et al. (2010) studied this question.
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