Issue 88, 2017, Issue in Progress

A low-loss electromagnetically induced transparency (EIT) metamaterial based on coupling between electric and toroidal dipoles

Abstract

Herein, an effective approach to construct a low-loss metamaterial by incorporating an electric toroidal dipole response into electromagnetically induced transparency (EIT) effect has been proposed, which is numerically and experimentally demonstrated. The low-loss metamaterial consists of an I-type cut wire (ICW) and two spiral ring resonators (SRRs). It is numerically verified that the low-loss electric toroidal dipole resonance can be excited by rational rotation of SRR, accompanied by a circumfluent magnetic field distribution. Via subtle geometry adjustment, we realized the spectral overlap of electric and toroidal dipoles and then observed a low-loss EIT resonance based on destructive couplings between them. In addition, the effect of parametric variation for the metamaterial on EIT resonance is investigated. In particular, we have experimentally verified that low-loss EIT resonance is also obtained by altering the rotation axis of two SRRs. By scaling down our structure, our design also applies to higher frequencies. This low-loss scheme provides possibilities for the design of low-loss optical devices and highly sensitive sensors.

Graphical abstract: A low-loss electromagnetically induced transparency (EIT) metamaterial based on coupling between electric and toroidal dipoles

Article information

Article type
Paper
Submitted
10 Oct 2017
Accepted
24 Nov 2017
First published
11 Dec 2017
This article is Open Access
Creative Commons BY license

RSC Adv., 2017,7, 55897-55904

A low-loss electromagnetically induced transparency (EIT) metamaterial based on coupling between electric and toroidal dipoles

L. Zhu, L. Dong, J. Guo, F. Meng, X. J. He, C. H. Zhao and Q. Wu, RSC Adv., 2017, 7, 55897 DOI: 10.1039/C7RA11175D

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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