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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 16 — Aug. 11, 2014
  • pp: 19401–19410

Excitation of dark plasmonic modes in symmetry broken terahertz metamaterials

Dibakar Roy Chowdhury, Xiaofang Su, Yong Zeng, Xiaoshuang Chen, Antoinette J. Taylor, and Abul Azad  »View Author Affiliations


Optics Express, Vol. 22, Issue 16, pp. 19401-19410 (2014)
http://dx.doi.org/10.1364/OE.22.019401


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Abstract

Plasmonic structures with high symmetry, such as double-identical gap split ring resonators, possess dark eigenmodes. These dark eigenmodes are dominated by magnetic dipole and/or higher-order multi-poles such as electric quadrapoles. Consequently these dark modes interact very weakly with the surrounding environment, and can have very high quality factors (Q). In this work, we have studied, experimentally as well as theoretically, these dark eigenmodes in terahertz metamaterials. Theoretical investigations with the help of classical perturbation theory clearly indicate the existence of these dark modes in symmetric plasmonic metamaterials. However, these dark modes can be excited experimentally by breaking the symmetry within the constituting metamaterial resonators cell, resulting in high quality factor resonance mode. The symmetry broken metamaterials with such high quality factor can pave the way in realizing high sensitivity sensors, in addition to other applications.

© 2014 Optical Society of America

OCIS Codes
(260.5740) Physical optics : Resonance
(160.3918) Materials : Metamaterials

ToC Category:
Plasmonics

History
Original Manuscript: May 16, 2014
Revised Manuscript: July 14, 2014
Manuscript Accepted: July 16, 2014
Published: August 4, 2014

Citation
Dibakar Roy Chowdhury, Xiaofang Su, Yong Zeng, Xiaoshuang Chen, Antoinette J. Taylor, and Abul Azad, "Excitation of dark plasmonic modes in symmetry broken terahertz metamaterials," Opt. Express 22, 19401-19410 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-16-19401


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