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Dependence of fluorescence on coupling from coupled Au nanoparticle - semiconductor quantum dot assemblies

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4 Author(s)
Wang, L. ; Center for High Technol. Mater., Univ. of New Mexico, Albuquerque, NM, USA ; Ankuciwiez, D. ; Chen, J.Y. ; Jain, R.K.

Enhanced nonlinear fluorescence is observed in distributed CdS nanocrystals and Au nanoparticles composite thin film. Well-defined spacings between the semiconductor quantum dots (SQDs) and the metal nanoparticles are considered. The samples are excited with the second harmonic generation of a mode-locked Ti-sapphire laser, and fluorescence spectra are measured. An approximately two-fold increase in linear fluorescence intensity is observed. Similar samples were prepared with Au nanorods (plasmon frequency ~ 750 nm, 25 nm cross-section diameter) to match the excitation wavelength with the resonant plasmon frequency of the Au nanorods. Preliminary results have shown a 10x enhancement of fluorescence.

Published in:

Lasers and Electro-Optics 2009 and the European Quantum Electronics Conference. CLEO Europe - EQEC 2009. European Conference on

Date of Conference:

14-19 June 2009