Journal
OPTICS EXPRESS
Volume 20, Issue 2, Pages 1760-1768Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.20.001760
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Funding
- National Taiwan University, National Science Council, Taiwan [99-2911-I-002-127, 99-2120-M-002-012, 100-2923-M-002-007-MY3, 100-2120-M-002-008]
- EPSRC, UK
- Royal Society, London
- National Center for Theoretical Sciences, Taipei Office, Molecular Imaging Center of National Taiwan University
- National Center for High-Performance Computing, Taiwan
- EPSRC [EP/G060363/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G060363/1] Funding Source: researchfish
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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
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