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(Color online) (a) Low and (b) higher magnification SEM images, (c) XRD pattern, and (d) Raman spectrum of the as-prepared ZnO nanodisks.
(Color online) (a) PL spectra from the ZnO nanodisks below and above the lasing threshold under femtosecond pulse laser excitation at ; (b) integrated emission intensity from nanodisks as a function of the excitation energy density (the lasing threshold is determined to be ; and time-resolved PL spectra from the ZnO nanodisks (c) at and (d) at under femtosecond pulse laser excitation at .
(Color online) (a) Far-field optical image and (b) typical lasing spectra from the ZnO nanodisks under picosecond pulse laser excitation at , and schematics of possible resonant cavity modes formed in hexagonal ZnO nanodisks: (c) WGM and (d) quasi-WGM.
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