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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 4 — Feb. 24, 2014
  • pp: 3747–3753

High-Q terahertz Fano resonance with extraordinary transmission in concentric ring apertures

Jie Shu, Weilu Gao, Kimberly Reichel, Daniel Nickel, Jason Dominguez, Igal Brener, Daniel M. Mittleman, and Qianfan Xu  »View Author Affiliations

Optics Express, Vol. 22, Issue 4, pp. 3747-3753 (2014)

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We experimentally demonstrate a polarization-independent terahertz Fano resonance with extraordinary transmission when light passes through two concentric subwavelength ring apertures in the metal film. The Fano resonance is enabled by the coupling between a high-Q dark mode and a low-Q bright mode. We find the Q factor of the dark mode ranges from 23 to 40, which is 3~6 times higher than Q of bright mode. We show the Fano resonance can be tuned by varying the geometry and dimension of the structures. We also demonstrate a polarization dependent Fano resonance in a modified structure of concentric ring apertures.

© 2014 Optical Society of America

OCIS Codes
(120.7000) Instrumentation, measurement, and metrology : Transmission
(260.5740) Physical optics : Resonance
(300.6495) Spectroscopy : Spectroscopy, teraherz
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Terahertz Optics

Original Manuscript: December 9, 2013
Revised Manuscript: January 30, 2014
Manuscript Accepted: January 31, 2014
Published: February 10, 2014

Jie Shu, Weilu Gao, Kimberly Reichel, Daniel Nickel, Jason Dominguez, Igal Brener, Daniel M. Mittleman, and Qianfan Xu, "High-Q terahertz Fano resonance with extraordinary transmission in concentric ring apertures," Opt. Express 22, 3747-3753 (2014)

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