Exciting dynamic anapoles with electromagnetic doughnut pulses
Exciting dynamic anapoles with electromagnetic doughnut pulses
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.
Raybould, Timothy, Andrew
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Fedotov, Vassili
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Papasimakis, Nikitas
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Youngs, I.
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Zheludev, Nikolai
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August 2017
Raybould, Timothy, Andrew
cd82c867-4261-44fa-ac5e-b1e537b6958f
Fedotov, Vassili
3725f5cc-2d0b-4e61-95c5-26d187c84f25
Papasimakis, Nikitas
f416bfa9-544c-4a3e-8a2d-bc1c11133a51
Youngs, I.
a057ce4a-7764-45c3-9b08-55ac3e6765e6
Zheludev, Nikolai
32fb6af7-97e4-4d11-bca6-805745e40cc6
Raybould, Timothy, Andrew, Fedotov, Vassili, Papasimakis, Nikitas, Youngs, I. and Zheludev, Nikolai
(2017)
Exciting dynamic anapoles with electromagnetic doughnut pulses.
Applied Physics Letters, 111 (8), [081104].
(doi:10.1063/1.4999368).
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.
Text
FD_Tor_APL_revisionII_v1
- Accepted Manuscript
More information
Accepted/In Press date: 14 July 2017
e-pub ahead of print date: 21 August 2017
Published date: August 2017
Identifiers
Local EPrints ID: 412700
URI: http://eprints.soton.ac.uk/id/eprint/412700
ISSN: 0003-6951
PURE UUID: e0cbcddb-8c99-431d-a0a2-cde1fe2fc49d
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Date deposited: 26 Jul 2017 16:31
Last modified: 16 Mar 2024 03:55
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Contributors
Author:
Timothy, Andrew Raybould
Author:
Vassili Fedotov
Author:
Nikitas Papasimakis
Author:
I. Youngs
Author:
Nikolai Zheludev
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