Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/86829
Title: Toroidal and magnetic Fano resonances in planar THz metamaterials
Authors: Srivastava, Yogesh Kumar
Han, Song
Gupta, Manoj
Cong, Longqing
Singh, Ranjan
Keywords: Quantum Field Theory
Electromagnetic Radiation
Issue Date: 2017
Source: Han, S., Gupta, M., Cong, L., Srivastava, Y. K., & Singh, R. (2017). Toroidal and magnetic Fano resonances in planar THz metamaterials. Journal of Applied Physics, 122(11), 113105-.
Series/Report no.: Journal of Applied Physics
Abstract: The toroidal dipole moment, a localized electromagnetic excitation of torus magnetic fields, has been observed experimentally in metamaterials. However, the metamaterial based toroidal moment was restricted at higher frequencies by the complex three-dimensional structure. Recently, it has been shown that toroidal moment could also be excited in a planar metamaterial structure. Here, we use asymmetric Fano resonators to illustrate theoretically and experimentally the underlying physics of the toroidal coupling in an array of planar metamaterials. It is observed that the anti-parallel magnetic moment configuration shows toroidal excitation with higher quality (Q) factor Fano resonance, while the parallel magnetic moment shows relatively lower Q factor resonance. Moreover, the electric and toroidal dipole interferes destructively to give rise to an anapole excitation. The magnetic dipole-dipole interaction is employed to understand the differences between the toroidal and magnetic Fano resonances. We further study the impact of intra unit-cell coupling between the Fano resonator pairs in the mirrored and non-mirrored arrangements. The numerical and theoretical approach for modelling the near-field effects and experimental demonstration of toroidal and magnetic Fano resonances in planar systems are particularly promising for tailoring the loss in metamaterials across a broad range of the electromagnetic spectrum.
URI: https://hdl.handle.net/10356/86829
http://hdl.handle.net/10220/44219
ISSN: 0021-8979
DOI: 10.1063/1.5001246
Rights: © 2017 The Authors (Published by AIP Publishing). This paper was published in Journal of Applied Physics and is made available as an electronic reprint (preprint) with permission of The Authors (Published by AIP Publishing). The published version is available at:[http://dx.doi.org/10.1063/1.5001246]. 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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