Backscattering enhancement, vanishing extinction, and morphological effects of active scatterers

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

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en

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12

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Journal of the Optical Society of America B: Optical Physics, Volume 40, issue 1, pp. 194-205

Abstract

Using analytical Lorenz-Mie scattering formalism and numerical methods, we analyze the response of active particles to electromagnetic waves. The particles are composed of homogeneous, non-magnetic, and dielectrically isotropic medium. Spherical scatterers and sharp and rounded cubes are treated. The absorption cross section of active particles is negative, thus showing gain in their electromagnetic response. Since the scattering cross section is always positive, their extinction can be either positive, negative, or zero.We construct a five-class categorization of active and passive dielectric particles.We point out the enhanced backscattering phenomenon that active scatterers display and also discuss extinction paradox and optical theorem. Finally, using COMSOL Multiphysics and an in-house method-of-moments code, the effects of the non-sphericity of active scatterers on their electromagnetic response are illustrated.

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Publisher Copyright: © 2022 Optica Publishing Group.

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Sihvola, A, Wallen, H, Yla-Oijala, P & Parveen, R 2023, 'Backscattering enhancement, vanishing extinction, and morphological effects of active scatterers', Journal of the Optical Society of America B: Optical Physics, vol. 40, no. 1, pp. 194-205. https://doi.org/10.1364/JOSAB.475441