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Proceedings Paper

Optical effects in artificial opals infiltrated with gold nanoparticles
Author(s): Davide Comoretto; Valentina Morandi; Franco Marabelli; Vincenzo Amendola; Moreno Meneghetti
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Paper Abstract

Polystyrene artificial opals are directly grown with embedded gold nanoparticles (NpAu) in their interstices. Reflectance spectra of samples having different sphere diameters and nanoparticles load clearly show a red shift of the photonic band gap as well as a reduction of its width without showing direct evidence of NpAu absorption. The case of transmission spectra is instead more complicated: here, overlapped to a broad NpAu absorption, a structure having unusual lineshape is detected. The infiltration of opal with NpAu removes the polarization dependence of the photonic band structure observed in bare opals. The lineshape of the absorption spectra suggest a spatial localization of the electromagnetic field in the volume where NpAu are confined thus enhancing its local intensity. This effect seems to be effective to stimulate optical nonlinearities of NpAu. Nanosecond transient absorption measurements on NpAu infiltrated opals indicate that a variation of transmission of about 10% is observed. Since this effect takes place within the pump pulse and since NpAu photoluminescence has been subtracted to the signal, we attribute it to an optical switching process.

Paper Details

Date Published: 18 April 2006
PDF: 8 pages
Proc. SPIE 6182, Photonic Crystal Materials and Devices III (i.e. V), 61820D (18 April 2006); doi: 10.1117/12.662066
Show Author Affiliations
Davide Comoretto, Univ. degli Studi di Genova (Italy)
Valentina Morandi, Univ. degli Studi di Pavia (Italy)
Franco Marabelli, Univ. degli Studi di Pavia (Italy)
Vincenzo Amendola, Univ. degli Studi di Padova (Italy)
Moreno Meneghetti, Univ. degli Studi di Padova (Italy)

Published in SPIE Proceedings Vol. 6182:
Photonic Crystal Materials and Devices III (i.e. V)
Richard M. De La Rue; Pierre Viktorovitch; Ceferino Lopez; Michele Midrio, Editor(s)

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