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(a) SEM image of a ZnO hexagonal microrod with a schematic WGM cavity and the light propagation path (dashed-line). (b) The schematic diagram for the lasing detection around the hexagonal ZnO microcavity by moving the OMA detector along the dashed-circle. The blue arrows denote the predominant light emitting directions.
(a) Emission spectra of the ZnO microrod excited by a Nd:YAG laser with different excitation power density. The inset is the far-field image of the lasing ZnO microrod taken by a digital camera. (b) The relationship between output lasing intensity and excitation power density.
(a) The simulated TE modes labeled with the mode numbers in the dispersion curve and (b) the lasing spectrum of the ZnO microrod excited at .
The far-field lasing intensity distribution around the -axis of the hexagonal ZnO microrod with the diagonal of inserted with the light emission pattern from a two-dimensional hexagonal cavity simulated by Wiersig (see Ref. 16).
The dependence of the lasing threshold (a) and the factor (b) on the diagonal of the hexagonal ZnO microrods.
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