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  • Vol. 36, Iss. 15 — Aug. 1, 2011
  • pp: 2901–2903

Anomalous terahertz transmission in bow-tie plasmonic antenna apertures

Yuping Yang, Ranjan Singh, and Weili Zhang  »View Author Affiliations


Optics Letters, Vol. 36, Issue 15, pp. 2901-2903 (2011)
http://dx.doi.org/10.1364/OL.36.002901


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Abstract

Arrays of subwavelength dipole bow-tie apertures are designed and characterized at terahertz frequencies. For an incident terahertz field perpendicular to the longer axis of the bow tie, a strong resonance enhancement, line narrowing, and a nonmonotonic frequency shift were observed with increasing length of the tapered bow-tie arms. Such characteristic behaviors primarily originate from localized surface plasmon resonances. In addition, with a decreasing aperture size, the contribution of localized plasmons becomes prominent due to an increase in plasmonic lifetime as the terahertz pulses strongly couple with the metallic surface surrounding the bow-tie apertures.

© 2011 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(300.6495) Spectroscopy : Spectroscopy, teraherz
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Spectroscopy

History
Original Manuscript: March 30, 2011
Revised Manuscript: June 8, 2011
Manuscript Accepted: June 12, 2011
Published: July 28, 2011

Citation
Yuping Yang, Ranjan Singh, and Weili Zhang, "Anomalous terahertz transmission in bow-tie plasmonic antenna apertures," Opt. Lett. 36, 2901-2903 (2011)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-36-15-2901


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