Amplitude and phase of light scattered by micro-scale aggregates of dielectric spheres: Comparison between theory and microwave analogy experiments

Abstract : Light scattering is a useful diagnostic tool for characterization of particles. Direct scattering measurements for arbitrarily shaped micro-scale particles is difficult due to small-scale limitations. Microwave analogy is a convenient approach to realize such measurements as it enables realization of analogous experiments with larger model particles in a spectral domain where wavelengths are on centimeter scale. In the present study a test model analogous to light scattering by a micro-scale aggregate of dielectric spheres was constructed and experimentally characterized in the microwave regime. Measured amplitude and phase of the scattered field were compared with theoretical predictions obtained from quasi-exact multiple-scattering T-matrix method and discrete dipole approximation (DDA). Excellent agreement demonstrates the validities of both the experiment and the models. (c) 2006 Elsevier Ltd. All rights reserved.
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Submitted on : Friday, February 5, 2010 - 1:27:25 PM
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Pierre Sabouroux, Brian Stout, Jean-Michel Geffrin, Christelle Eyraud, I. Ayranci, et al.. Amplitude and phase of light scattered by micro-scale aggregates of dielectric spheres: Comparison between theory and microwave analogy experiments. Journal of Quantitative Spectroscopy and Radiative Transfer, Elsevier, 2007, 103 (1), pp.156-167. ⟨10.1016/j.jqsrt.2006.06.001⟩. ⟨hal-00453659⟩

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