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Optics Express

Optics Express

  • Editor: C. Martijin de Sterke
  • Vol. 19, Iss. 7 — Mar. 28, 2011
  • pp: 6312–6319

Optics InfoBase > Optics Express > Volume 19 > Issue 7 > Page 6312

Sharp Fano resonances in THz metamaterials

Ranjan Singh, Ibraheem A. I. Al-Naib, Martin Koch, and Weili Zhang  »View Author Affiliations


Optics Express, Vol. 19, Issue 7, pp. 6312-6319 (2011)
http://dx.doi.org/10.1364/OE.19.006312


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Abstract

We report on the occurrence of sharp Fano resonances in planar terahertz metamaterials by introducing a weak asymmetry in a two gap split ring resonator. As the structural symmetry of the metamaterial is broken a Fano resonance evolves in the low-frequency flank of the symmetric fundamental dipole mode resonance. This Fano resonance can have much higher Q factors than that known from single gap split ring resonators. Supporting simulations indicate a Q factor of 50 for lowest degree of asymmetry. The Q factor decreases exponentially with increasing asymmetry. Hence, minute structural variations allow for a tuning of the Fano resonance. Such sharp resonances could be exploited for biochemical sensing. Besides, the strong current oscillations excited at the Fano resonance frequency could lead to the design of novel terahertz narrow band emitters.

© 2011 OSA

OCIS Codes
(260.5740) Physical optics : Resonance
(160.3918) Materials : Metamaterials
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Metamaterials

History
Original Manuscript: February 3, 2011
Revised Manuscript: March 2, 2011
Manuscript Accepted: March 4, 2011
Published: March 18, 2011

Citation
Ranjan Singh, Ibraheem A. I. Al-Naib, Martin Koch, and Weili Zhang, "Sharp Fano resonances in THz metamaterials," Opt. Express 19, 6312-6319 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-7-6312


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