Design of plasmonic toroidal metamaterials at optical frequencies

Yao-Wei Huang*, Wei Ting Chen, Pin Chieh Wu, Vassili Fedotov, Vassili Savinov, You Zhe Ho, Yuan-Fong Chau, Nikolay I. Zheludev, Din Ping Tsai

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Toroidal multipoles are the subject of growing interest because of their unusual electromagnetic properties different from the electric and magnetic multipoles. In this paper, we present two new related classes of plasmonic metamaterial composed of purposely arranged of four U-shaped split ring resonators (SRRs) that show profound resonant toroidal responses at optical frequencies. The toroidal and magnetic responses were investigated by the finite-element simulations. A phenomenon of reversed toroidal responses at higher and lower resonant frequencies has also been reported between this two related metamaterials which results from the electric and magnetic dipoles interaction. Finally, we propose a physical model based on coupled LC circuits to quantitatively analyze the coupled system of the plasmonic toroidal metamaterials. (C) 2012 Optical Society of America

Original languageEnglish
Pages (from-to)1760-1768
Number of pages9
JournalOptics Express
Volume20
Issue number2
DOIs
StatePublished - 16 Jan 2012

Keywords

  • NEGATIVE REFRACTIVE-INDEX
  • MAGNETIC RESPONSE

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