aalto1 untyped-item.component.html
Conditions for breaking the extinction symmetry in electromagnetic scattering
Loading...
Access rights
embargoedAccess
URL
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal (opens in new window)
Other link related to publication (opens in new window)
View publication in the Research portal (opens in new window)
Other link related to publication (opens in new window)
Date
Major/Subject
Mcode
Degree programme
Language
en
Pages
11
Series
Journal of the Optical Society of America A: Optics, Image Science and Vision, Volume 42, issue 8, pp. 1155-1165
Abstract
Previous studies have shown that the extinction efficiency of reciprocal scatterers of arbitrary shape is the same under illumination with plane electromagnetic waves of opposite incident directions with the same field polarizations. It has also been shown that to break this symmetry, all related symmetries, including time-reversal, spatial inversion, and rotational symmetries, should be broken. In this paper, we further investigate the conditions for breaking the extinction symmetry. Our numerical experiments indicate that breaking the time-reversal and geometrical symmetries is not sufficient, rather the object should also be non-reciprocal. However, while non-reciprocity is necessary, it is not sufficient: a certain asymmetry with respect to the incident plane wave is also required. To break the extinction symmetry with these conditions, the polarization of the incident waves has to be linear or elliptical. For circular polarization, the extinction invariance cannot be broken with any geometry or non-reciprocity. Additionally, with characteristic modes, we study and explain the observation that for opposite illumination directions, the electromagnetic fields can be completely different while the corresponding extinction cross-sections coincide.
Description
Keywords
Other note
Citation
Yla-Oijala, P, Kong, B, Blumel, R, Sihvola, A, Wallen, H & Kohler, A 2025, 'Conditions for breaking the extinction symmetry in electromagnetic scattering', Journal of the Optical Society of America A: Optics, Image Science and Vision, vol. 42, no. 8, pp. 1155-1165. https://doi.org/10.1364/JOSAA.568970