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(Color online) (a) Top-view FESEM of a ZnO inverse opal with lattice constant . (b) Optical microscope images (magnification of ) of ZnO inverse opals with lattice constants (violet) and (green).
(Color online) (a) Emission spectra as a function of pump intensity and (b) curve of ZnO inverse opal with for increasing pump intensity. Inset: Enlarged view of the curve for low pump intensity region . The first and second thresholds occur at 0.38 and , respectively.
(Color online) (a) Lasing (pump intensity ) and reflection spectra and (b) curves of ZnO inverse opals with different lattice constants. The areas enclosed by dotted lines indicate the position of the primary photonic pseudogap obtained by photonic band structures computed using a freely available software package (Ref. 24).
Lasing spectra under a pump intensity of for the electrodeposited ZnO inverse opal and the unstructured ZnO thin film.
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