Enhanced amplified emission induced by surface plasmons on gold nanoparticles in polymer film random lasers

Autor:	Dan Davidov, Oleg Popov, Alexander Zilbershtein
Rok vydání:	2007
Předmět:	Materials science Dye laser Polymers and Plastics business.industry Scattering Surface plasmon Physics::Optics Nanoparticle Laser Molecular physics law.invention Optics law Colloidal gold business Absorption (electromagnetic radiation) Lasing threshold
Zdroj:	Polymers for Advanced Technologies. 18:751-755
ISSN:	1099-1581 1042-7147
DOI:	10.1002/pat.938
Popis:	We report on random lasing from polymer films containing Rh6G laser dye and gold nanoparticles (AuNPs). Different sizes of AuNP, varying from 10 to 150 nm, were used in the different films, but all had the same mass concentration of gold. We found a strong dependence of the random lasing characteristics (threshold for lasing, the emission intensity, and the spectral narrowing) on the size of the AuNP. In particular, we show that the emission intensity and threshold for lasing versus the NP size qualitatively agree with the prediction of the Mie-type calculation that considers both the scattering cross section and the absorption of the NP. The experimental spectral narrowing versus the pumping energy is in qualitative agreement with calculations based on diffusion equations (which include appropriate scattering and absorbing terms). This suggests that photon scattering, as enhanced by surface plasmons (SPs) originating on the AuNP, is the dominant underlying mechanism for random lasing of our polymers. Copyright © 2007 John Wiley & Sons, Ltd.
Databáze:	OpenAIRE
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