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1 February 2007 Metal-insulator nanocomposites which act optically like homogeneous conductors
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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.
Geoffrey B. Smith, Angus R. Gentle, and Abbas I. Maaroof "Metal-insulator nanocomposites which act optically like homogeneous conductors," Journal of Nanophotonics 1(1), 013507 (1 February 2007).
Published: 1 February 2007

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