Optical anapole metamaterial
Optical anapole metamaterial
The toroidal dipole is a localized electromagnetic excitation independent from the familiar magnetic and electric dipoles. It corresponds to currents flowing along minor loops of a torus. Interference of radiating induced toroidal and electric dipoles leads to anapole, a non-radiating charge-current configuration. Interactions of induced toroidal dipoles with electromagnetic waves have recently been observed in artificial media at microwave, terahertz and optical frequencies. Here, we demonstrate a quasi-planar plasmonic metamaterial – a combination of dumbbell aperture and vertical split-ring resonator - that exhibits transverse toroidal moment and resonant anapole behavior in the optical part of the spectrum upon excitation with a normally incident electromagnetic wave. Our results prove experimentally that toroidal modes and anapole modes can provide distinct and physically significant contributions to the absorption and dispersion of slabs of matter in the optical part of the spectrum in conventional transmission and reflection experiments.
1920–1927
Wu, Pin Chieh
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Liao, Chun Yen
ace43f43-2ea7-4e57-9555-58555103859d
Savinov, Vassili
147c7954-4636-4438-a305-cd78539f7c0a
Chung, Tsung Ling
f700cf3f-2f5d-4854-8ea1-b5185e39c6bb
Chen, Wei Ting
a5ad3064-c640-4412-883f-480d9f0a9457
Huang, Yao-Wei
1b0b4164-6df3-4a7a-8e93-26304b902b45
Wu, Pei Ru
24c2f120-ed35-4ce8-bfdb-ddacca1c50ec
Chen, Yi-Hao
70154881-9967-41fe-ae01-1faeb4a0651b
Liu, Ai-Qun
c97f69b0-2fc8-45de-a637-a5e1b15817f3
Zheludev, Nikolai
32fb6af7-97e4-4d11-bca6-805745e40cc6
Tsai, Din Ping
b81c215f-6f43-4cbf-898c-965532b92534
1 May 2018
Wu, Pin Chieh
1d63065a-5d41-4599-bca2-23bbf05ae42f
Liao, Chun Yen
ace43f43-2ea7-4e57-9555-58555103859d
Savinov, Vassili
147c7954-4636-4438-a305-cd78539f7c0a
Chung, Tsung Ling
f700cf3f-2f5d-4854-8ea1-b5185e39c6bb
Chen, Wei Ting
a5ad3064-c640-4412-883f-480d9f0a9457
Huang, Yao-Wei
1b0b4164-6df3-4a7a-8e93-26304b902b45
Wu, Pei Ru
24c2f120-ed35-4ce8-bfdb-ddacca1c50ec
Chen, Yi-Hao
70154881-9967-41fe-ae01-1faeb4a0651b
Liu, Ai-Qun
c97f69b0-2fc8-45de-a637-a5e1b15817f3
Zheludev, Nikolai
32fb6af7-97e4-4d11-bca6-805745e40cc6
Tsai, Din Ping
b81c215f-6f43-4cbf-898c-965532b92534
Wu, Pin Chieh, Liao, Chun Yen, Savinov, Vassili, Chung, Tsung Ling, Chen, Wei Ting, Huang, Yao-Wei, Wu, Pei Ru, Chen, Yi-Hao, Liu, Ai-Qun, Zheludev, Nikolai and Tsai, Din Ping
(2018)
Optical anapole metamaterial.
ACS Nano, 12 (1920), .
(doi:10.1021/acsnano.7b08828).
Abstract
The toroidal dipole is a localized electromagnetic excitation independent from the familiar magnetic and electric dipoles. It corresponds to currents flowing along minor loops of a torus. Interference of radiating induced toroidal and electric dipoles leads to anapole, a non-radiating charge-current configuration. Interactions of induced toroidal dipoles with electromagnetic waves have recently been observed in artificial media at microwave, terahertz and optical frequencies. Here, we demonstrate a quasi-planar plasmonic metamaterial – a combination of dumbbell aperture and vertical split-ring resonator - that exhibits transverse toroidal moment and resonant anapole behavior in the optical part of the spectrum upon excitation with a normally incident electromagnetic wave. Our results prove experimentally that toroidal modes and anapole modes can provide distinct and physically significant contributions to the absorption and dispersion of slabs of matter in the optical part of the spectrum in conventional transmission and reflection experiments.
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Accepted/In Press date: 26 January 2018
e-pub ahead of print date: 27 January 2018
Published date: 1 May 2018
Identifiers
Local EPrints ID: 417378
URI: http://eprints.soton.ac.uk/id/eprint/417378
ISSN: 1936-0851
PURE UUID: d8f4aa22-4f00-43c8-845a-b1491addf680
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Date deposited: 30 Jan 2018 17:30
Last modified: 16 Mar 2024 06:09
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Contributors
Author:
Pin Chieh Wu
Author:
Chun Yen Liao
Author:
Vassili Savinov
Author:
Tsung Ling Chung
Author:
Wei Ting Chen
Author:
Yao-Wei Huang
Author:
Pei Ru Wu
Author:
Yi-Hao Chen
Author:
Ai-Qun Liu
Author:
Nikolai Zheludev
Author:
Din Ping Tsai
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