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The emission spectra under different excitation power density for an individual ZnO microrod with . Insets show its SEM image and the dependence of peak intensity on excitation power density.
The combined emission spectra of two ZnO microrods with diagonal and under different excitation power density inserted with dependence of peak intensity on the excitation power density for microrod.
(a) The representative emission spectrum under the excitation power density . (b) The simulated lasing spectrum according to the theoretical resonant wavelengths of two ZnO microrod with diagonal and .
(a) Emission spectra for the multiple ZnO microrods under different excitation power density inserted with the dependence of peak intensity on excitation power density. (b) The relationship between mode number and lasing emission peaks for ZnO microrods with different size, red dots denote the theoretical lasing emission wavelength and the corresponding mode number, triangles denote the experiment result.
Calculation of WGM TE mode number and the theoretical resonant wavelength
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