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Title: Optical anapole metamaterial
Authors: Wu, Pin Chieh
Liao, Chun Yen
Savinov, Vassili
Chung, Tsung Lin
Chen, Wei Ting
Huang, Yao-Wei
Wu, Pei Ru
Chen, Yi-Hao
Liu, Ai-Qun
Zheludev, Nikolay I.
Tsai, Din Ping
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2018
Source: Wu, P. C., Liao, C. Y., Savinov, V., Chung, T. L., Chen, W. T., Huang, Y.-W., . . . Tsai, D. P. (2018). Optical anapole metamaterial. ACS Nano, 12(2), 1920-1927. doi:10.1021/acsnano.7b08828
Journal: ACS Nano
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 nonradiating 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.
ISSN: 1936-0851
DOI: 10.1021/acsnano.7b08828
Rights: © 2018 American Chemical Society. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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