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Design of plasmonic toroidal metamaterials at optical frequencies

Yao-Wei Huang1, Wei Ting Chen1, Pin Chieh Wu1,2, Vassili Fedotov3, Vassili Savinov3, You Zhe Ho2, Yuan-Fong Chau4, Nikolay I.Zheludev3, and Din Ping Tsai1,2,5,6

1. Graduate Institute of Applied Physics, National Taiwan University, Taipei 10617, Taiwan
2. Department of Physics, National Taiwan University, Taipei 10617, Taiwan
3. Optoelectronics Research Centre and Centre for Photonic Metamaterials, University of Southampton, UK
4. Department of Electronic Engineering, Ching Yun University, Jung-Li 320, Taiwan
5. Instrument Technology Research Center, National Applied Research Laboratories, Hsinchu 300, Taiwan
6. Research Center for Applied Sciences, Academia Sinica, Taipei 115, Taiwan

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.


Optics Express (2012) Vol.20(2) pp.1760-1768

doi: 10.1364/OE.20.001760

Southampton ePrint id: 301210

 

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