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Journal of Nanophotonics

Metal-insulator nanocomposites which act optically like homogeneous conductors
Author(s): Geoffrey B. Smith; Angus R. Gentle; Abbas I. Maaroof
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Paper Abstract

Abstract. Conductor-insulator nanocomposites in which the conductor percolates can have optical responses at longer wavelengths like dense conductors with an effective plasma frequency wp*. This applies at wavelengths where the Bergman spectral function F for permittivity varies sufficiently slowly with wavelength. wp* can be engineered by varying the components, the nanostructure's topology, or the dielectric volume fraction f. The homogenized conductor acts like a dense conductor whose charge carriers have effective mass meff*. Results are presented for wp*(f) and meff*(f) using the Maxwell Garnett (MG) and Bruggemann (BR) models for spheres and aligned ellipsoids. In the BR case meff*(f) at the percolation concentration is singular. Example wp* data for spheres and ellipsoids are given which match predictions. Anisotropy in effective mass is considered, such that effective plasma frequency can depend strongly on polarisation direction of incident light.

Paper Details

Date Published: 1 February 2007
PDF: 15 pages
J. Nanophoton. 1(1) 013507 doi: 10.1117/1.2711706
Published in: Journal of Nanophotonics Volume 1, Issue 1
Show Author Affiliations
Geoffrey B. Smith, Univ. of Technology/Sydney (Australia)
Angus R. Gentle, Univ. of Technology/Sydney (Australia)
Abbas I. Maaroof, Univ. of Technology/Sydney (Australia)

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