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

Ari Sihvola*, Henrik Wallen, Pasi Yla-Oijala, Rashda Parveen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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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.

Original languageEnglish
Pages (from-to)194-205
Number of pages12
JournalJournal of the Optical Society of America B: Optical Physics
Volume40
Issue number1
DOIs
Publication statusPublished - 1 Jan 2023
MoE publication typeA1 Journal article-refereed

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