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Title: Exciting dynamic anapoles with electromagnetic doughnut pulses
Authors: Raybould, Tim
Fedotov, Vassili A.
Papasimakis, Nikitas
Youngs, Ian
Zheludev, Nikolay I.
Keywords: Dielectrics
Maxwell equations
Issue Date: 2017
Source: Raybould, T., Fedotov, V. A., Papasimakis, N., Youngs, I., & Zheludev, N. I. (2017). Exciting dynamic anapoles with electromagnetic doughnut pulses. Applied Physics Letters, 111(8), 081104-.
Series/Report no.: Applied Physics Letters
Abstract: As was predicted in 1995 by Afanasiev and Stepanovsky, a superposition of electric and toroidal dipoles can lead to a non-trivial non-radiating charge current-configuration, the dynamic anapole. The dynamic anapoles were recently observed first in microwave metamaterials and then in dielectric nanodisks. However, spectroscopic studies of toroidal dipole and anapole excitations are challenging owing to their diminishing coupling to transverse electromagnetic waves. Here, we show that anapoles can be excited by electromagnetic Flying Doughnut (FD) pulses. First described by Helwarth and Nouchi in 1996, FD pulses (also known as “Flying Toroids”) are space-time inseparable exact solutions to Maxwell's equations that have toroidal topology and propagate in free-space at the speed of light. We argue that FD pulses can be used as a diagnostic and spectroscopic tool for the dynamic anapole excitations in matter.
ISSN: 0003-6951
DOI: 10.1063/1.4999368
Rights: © 2017 American Institute of Physics (AIP). This paper was published in Applied Physics Letters and is made available as an electronic reprint (preprint) with permission of American Institute of Physics (AIP). The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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