Research Papers

Metal-insulator nanocomposites which act optically like homogeneous conductors

[+] Author Affiliations
Geoff Smith, Angus Gentle, Abbas I. Maaroof

University of Technology, Sydney

J. Nanophoton. 1(1), 013507 (February 6, 2007). doi:10.1117/1.2711706
History: Received December 10, 2006; Revised January 29, 2007; Accepted February 2, 2007; February 6, 2007; Online February 06, 2007
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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.

© 2007 Society of Photo-Optical Instrumentation Engineers

Citation

Geoff Smith ; Angus Gentle and Abbas I. Maaroof
"Metal-insulator nanocomposites which act optically like homogeneous conductors", J. Nanophoton. 1(1), 013507 (February 6, 2007). ; http://dx.doi.org/10.1117/1.2711706


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