Multiband superbackscattering via mode superposition in a single dielectric particle

The superposition of resonances in a subwavelength particle can be used to achieve powerful scattering beyond the single channel limit and can also determine the directionality of scattered radiation. It has been proposed that by overlapping modes only with equivalent polarity in the far-field, a “s...

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Veröffentlicht in:	Applied physics letters 2021-06, Vol.118 (25)
Hauptverfasser:	Powell, Alexander W., Hibbins, Alastair P., Sambles, J. Roy
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied physics Backscattering Far fields Radar cross sections Resonance scattering
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container_title	Applied physics letters
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description	The superposition of resonances in a subwavelength particle can be used to achieve powerful scattering beyond the single channel limit and can also determine the directionality of scattered radiation. It has been proposed that by overlapping modes only with equivalent polarity in the far-field, a “superbackscattering” condition, where the total backscattered power is maximized, can be achieved. This effect can be observed through the simple geometry of a high permittivity, subwavelength sphere with a hollow core, and we demonstrate this experimentally by comparing the radar cross section (RCS) of such structures, attaining a doubling of the RCS compared to a solid particle. Furthermore, we show that several sets of modes can be overlapped at once, leading to a multiband, superbackscattering effect.
doi_str_mv	10.1063/5.0054725
format	Article
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subjects	Applied physics Backscattering Far fields Radar cross sections Resonance scattering
title	Multiband superbackscattering via mode superposition in a single dielectric particle
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