Optical waveguide and cavity effects on whispering-gallery mode resonances in a ZnO nanonail

Jinzhang Liu; Quang Minh Ngo; Kyung Ho Park; Sangin Kim; Yeong Hwan Ahn; Ji-Yong Park; Ken Ha Koh; Soonil Lee
November 2009
Applied Physics Letters;11/30/2009, Vol. 95 Issue 22, p221105
Academic Journal
Spatially resolved cathodoluminescence (CL) study of a ZnO nanonail, having thin shank, tapered neck, and hexagonal head sections, is reported. Monochromatic imaging and line-scan profiling indicate that the wave guiding and leaking from growth imperfections in addition to the oxygen-deficiency variation determine the spatial contrast of CL emissions. Occurrence of resonance peaks at identical wavelengths regardless of CL-excitation spots is inconsistent with the whispering-gallery mode (WGM) resonances of a two-dimensional cavity in the finite-difference time domain simulation. However, three-dimensioanl cavity simulation produced WGM peaks that are consistent with the experimental spectra, including transverse-electric resonances that are comparable to transverse-magnetic ones.


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