Resonant transparency and non-trivial non-radiating excitations in toroidal metamaterials

V.A. Fedotov, A.V. Rogacheva, V. Savinov, Din-ping Tsai, N.I. Zheludev

Research output: Journal article publicationJournal articleAcademic researchpeer-review

169 Citations (Scopus)

Abstract

Engaging strongly resonant interactions allows dramatic enhancement of functionalities of many electromagnetic devices. However, resonances can be dampened by Joule and radiation losses. While in many cases Joule losses may be minimized by the choice of constituting materials, controlling radiation losses is often a bigger problem. Recent solutions include the use of coupled radiant and sub-radiant modes yielding narrow asymmetric Fano resonances in a wide range of systems, from defect states in photonic crystals and optical waveguides with mesoscopic ring resonators to nanoscale plasmonic and metamaterial systems exhibiting interference effects akin to electromagnetically-induced transparency. Here we demonstrate theoretically and confirm experimentally a new mechanism of resonant electromagnetic transparency, which yields very narrow isolated symmetric Lorentzian transmission lines in toroidal metamaterials. It exploits the long sought non-trivial non-radiating charge-current excitation based on interfering electric and toroidal dipoles that was first proposed by Afanasiev and Stepanovsky in [J. Phys. A Math. Gen. 28, 4565 (1995)].
Original languageEnglish
Article number2967
JournalScientific Reports
Volume3
DOIs
Publication statusPublished - 17 Oct 2013
Externally publishedYes

ASJC Scopus subject areas

  • General

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