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Complex refractive index of non-spherical particles in the vis-NIR region - application to Bacillus Subtilis spores

Velazco-Roa, Maria A and Dzhongova, Elitsa and Thennadil, Suresh N. (2008) Complex refractive index of non-spherical particles in the vis-NIR region - application to Bacillus Subtilis spores. Applied Optics, 47 (33). pp. 6183-6189. ISSN 1559-128X

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Abstract

A method is presented for the estimation of optical constants in the ultraviolet-visible-near-infrared (UVVis- NIR) region of nonspherical particles in a suspension at concentrations where multiple scattering is significant. The optical constants are obtained by an inversion technique using the adding-doubling method to solve the radiative transfer equation in combination with the single scattering theories for modelling scattering by nonspherical particles. Two methods for describing scattering by single scattering are considered: the T-matrix method and the approximate but computationally simpler Rayleigh- Gans-Debye (RGD) approximation. The method is then applied to obtain the optical constants of Bacillus subtilis spores in the wavelength region 400-1200 nm. It is found that the optical constants obtained using the RGD approximation matches those obtained using the T-matrix method to within experimental error.

Item type: Article
ID code: 13724
Keywords: complex refractive index, nonspherical particles, infrared region, Bacillus subtilis spores, adding-doubling method, radiative transfer equation, single scattering theories, t-matrix method, rayleigh–gans–debye approximation, Optics. Light, Chemical engineering, Atomic and Molecular Physics, and Optics
Subjects: Science > Physics > Optics. Light
Technology > Chemical engineering
Department: Faculty of Engineering > Chemical and Process Engineering
Depositing user: Dr Suresh N. Thennadil
Date Deposited: 13 Jan 2010 14:23
Last modified: 18 Jun 2015 09:46
URI: http://strathprints.strath.ac.uk/id/eprint/13724

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