We report room-temperature ultraviolet lasing in ZnO inverse opals fabricated via colloidal templating with electrochemical infiltration. Lasing occurs above an excitation threshold of 0.38 MW cm2. Lasing modes associated with radiative recombinations of exciton-exciton (ex-ex) and electron-hole plasma (EHP) were discerned. Compared to ZnO polycrystalline film, lasing wavelength blueshifts and ex-ex lasing with a narrower bandwidth have been realized. Tuning the primary photonic pseudogap of inverse opals to gain maximum reduces the threshold for EHP lasing. We infer that periodic structures facilitate strain-induced change in lasing energy and provide modulation in refractive index for enhanced light confinement as well as optical feedback.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)