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Proceedings Paper

Optical response of nanostructured metal/dielectric composites and multilayers
Author(s): Geoffrey B. Smith; Abbas I. Maaroof; Rodney S. Allan; Stefan Schelm; Geoffrey R. Anstis; Michael B. Cortie
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Paper Abstract

The homogeneous optical response in conducting nanostructured layers, and in insulating layers containing dense arrays of self assembled conducting nanoparticles separated by organic linkers, is examined experimentally through their effective complex indices (n*, k*). Classical effective medium models, modified to account for the 3-phase nanostructure, are shown to explain (n*, k*) in dense particulate systems but not inhomogeneous layers with macroscopic conductance for which a different approach to homogenisation is discussed. (n*, k*) data on thin granular metal films, thin mesoporous gold, and on thin metal layers containing ordered arrays of voids, is linked to properties of the surface plasmon states which span the nanostructured film. Coupling between evanescent waves at either surface counterbalanced by electron scattering losses must be considered. Virtual bound states for resonant photons result, with the associated transit delay leading to a large rise in n* in many nanostructures. Overcoating n-Ag with alumina is shown to alter (n*, k*) through its impact on the SP coupling. In contrast to classical optical homogenisation, effective indices depend on film thickness. Supporting high resolution SEM images are presented.

Paper Details

Date Published: 2 August 2004
PDF: 14 pages
Proc. SPIE 5508, Complex Mediums V: Light and Complexity, (2 August 2004); doi: 10.1117/12.555971
Show Author Affiliations
Geoffrey B. Smith, Univ. of Technology/Sydney (Australia)
Abbas I. Maaroof, Univ. of Technology/Sydney (Australia)
Rodney S. Allan, Univ. of Technology/Sydney (Australia)
Stefan Schelm, Univ. of Technology/Sydney (Australia)
Geoffrey R. Anstis, Univ. of Technology/Sydney (Australia)
Michael B. Cortie, Univ. of Technology/Sydney (Australia)

Published in SPIE Proceedings Vol. 5508:
Complex Mediums V: Light and Complexity
Martin W. McCall; Graeme Dewar, Editor(s)

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