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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/3861

Title: Carbon-in-silica composite selective solar absorbers: a determination of composition and dielectric properties
Authors: Katumba, G
Forbes, A
Keywords: Bruggeman
Maxwell Garnett
Bergman
Effective medium approximations
Carbon-in-silica
Solar absorbers
Dielectric properties
Issue Date: Aug-2009
Publisher: Society of Photo-optical Instrumentation Engineers (SPIE)
Citation: Katumba, G and Forbes, A. 2009. Carbon-in-silica composite selective solar absorbers: a determination of composition and dielectric properties. Optical Modeling and Measurements for Solar Energy Systems III. San Diego, USA, 2 August 2009, pp 1-9
Abstract: The Bruggeman and Maxwell-Garnett effective medium approximations have been used widely to investigate optical properties of many different composite materials. In most cases, the effective medium approximation assumptions are based on random unit cell models in which some metal particles are embedded in a dielectric medium. The shapes of the embedded particles can be varied between spherical, ellipsoidal and cylindrical shapes. A new and interesting structure of connected short chains of completely amorphous carbon intermixed with short chains of silica at nanoscale level has been observed recently. A generalised Bergman representation based on an arbitrary spectral density function is currently applied on these carbon-in-silica samples with a reasonable success of fitting between experiment and theory. The curve-fitting procedure adopted here has resulted in information such as volume fraction of carbon relative to silica, percolation threshold, the thickness and effective dielectric function of the composite layer.
Description: Copyright 2009 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited
URI: http://hdl.handle.net/10204/3861
Appears in Collections:Nanotechnology
Laser physics and technology
Laser materials processing
Manufacturing science and technology
General science, engineering & technology

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