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29 December 2004 Backscattering of agglomerate particles
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We examine how aggregation affects the light-scattering signatures, especially the polarization in the near-backward-scattering direction. We use the discrete dipole approximation (DDA) to study the backscatter of agglomerate particles consisting of oblong monomers. We examine the effects of monomer number and packing structure on the resulting negative polarization branch at small phase angle. We find large a dependence on the orientation of the monomers within the agglomerate and a smaller dependence on the number of monomers, suggesting that the mechanism producing the negative polarization minimum depends strongly on the interactions between the individual monomers. We also examine experimental measurements of substrates composed of biological cells. We find that the light-scattering signatures in the backward direction are not only different for different spore species, but for spores that have been prepared using different methodologies. These signatures are reproducible in different substrates composed of the spores from the same batches.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Evgenij Zubko, Andrey Ovcharenko, Sergey Bondarenko, Yuriy Shkuratov, Cathy S. Scotto, Charles Merritt, Matthew B. Hart, Jay D. Eversole, and Gorden W. Videen "Backscattering of agglomerate particles", Proc. SPIE 5617, Optically Based Biological and Chemical Sensing for Defence, (29 December 2004);

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