- Conference date: 17–21 May 2009
- Location: Cairo (Egypt)
A convenient and straightforward way to fabricate random lasing films based on ZnO is proposed. Highly scattering films consisting of ZnO nanoparticles are fabricated following a two‐stage process that involves a) spin‐coating of aqueous ZnO nanoparticle dispersions on rigid (glass) or flexible (polyethylene terephthalate) substrates and b) subsequent surface modification by means of a controlled UV laser annealing processing. Upon excitation with 150 picosecond pulses at 355 nm, the films exhibit intense photoluminescence emission, which upon crossing a threshold pump energy density, develops laser‐like characteristics, namely, gain amplification, spectral narrowing and, under optimum pump conditions and sample structure, distinct lasing modes.
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