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Proceedings Paper

Saturable absorption of femtosecond laser pulses at surface plasmon resonance in gold nanoshells
Author(s): Ida Ros; Piero Schiavuta; Giovanni Mattei; Renato Bozio
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Paper Abstract

In this work, we present an investigation of the nonlinear optical properties of nanoshells of different size in solutions and deposited on glass substrates using a single beam z-scan method at a wavelength of 806 nm with laser duration of 170 fs. Structural properties of gold nanoshells of about 150 and 220 nm, prepared in water, are characterized by AFM and TEM microscopy. It is found that, in general, they behave as saturable absorbers. The level of saturation depends on the relative overlap between the plasmon resonance of nanoshells and the laser excitation wavelengths. The nonlinear absorption coefficient, obtained by fitting the experimental results, is of the order of -10-11 cmW-1.

Paper Details

Date Published: 2 September 2009
PDF: 11 pages
Proc. SPIE 7394, Plasmonics: Metallic Nanostructures and Their Optical Properties VII, 739412 (2 September 2009); doi: 10.1117/12.825859
Show Author Affiliations
Ida Ros, Univ. of Padova (Italy)
Piero Schiavuta, CIVEN (Italy)
Giovanni Mattei, Univ. degli Studi di Padova (Italy)
Renato Bozio, Univ. degli Studi di Padova (Italy)

Published in SPIE Proceedings Vol. 7394:
Plasmonics: Metallic Nanostructures and Their Optical Properties VII
Mark I. Stockman, Editor(s)

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