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Enhanced fluorescence by metal nanospheres on metal substrates

Stefania D’Agostino, Pier Paolo Pompa, Rocco Chiuri, Raymond J. Phaneuf, Dominic G. Britti, Rosaria Rinaldi, Roberto Cingolani, and Fabio Della Sala

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Abstract

We investigate the metal enhanced fluorescence by silver nanospheres on a thin silver substrate. Experimental measurements for core/shell colloidal nanocrystals embedded in a polymer matrix show a fluorescence enhancement factor of about 9. We apply the discrete dipole approximation method to describe the local-field enhancement factor (LFEF). We find that the observed fluorescence enhancement is related to the broad LFEF profile induced by the substrate.

© 2009 Optical Society of America

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