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Proceedings Paper

THz anomalous transmission in plasmonic lattices: incidence angle dependence
Author(s): Tho D. Nguyen; Ajay Nahata; Z. Valy Vardeny
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Paper Abstract

The phenomenon of anomalous transmission through subwavelength aperture arrays in metallic films (plasmonic lattices) is thought to be mediated by surface plasmon polaritons (SPP) on the film surfaces. Using terahertz time-domain spectroscopy we systematically studied the anomalous transmission spectrum through plasmonic lattices as a function of the incidence angle, θ of the impinging beam. We observed splitting of the various transmission resonances into two resonance branches when θ deviates from normal incidence that depends on the polarization direction of the beam respect to the plane of incidence and θ. We show that the transmission resonance splitting is not related to dispersion relation of different SPP branches, but rather is associated to the interference properties of the SPP waves on the metal surface. The dependence of the split resonant frequencies vs. θ is fit with a theoretical formula that takes into account the effective dielectric function of the plasmonic lattice vs. θ, which emphasizes the important role of the Fanotype anti-resonances in the transmission spectrum. Finally, we introduced a simple way for making an efficient notch filter with high Q factor exploiting the splitting of transmission resonance under rotation.

Paper Details

Date Published: 2 September 2009
PDF: 7 pages
Proc. SPIE 7394, Plasmonics: Metallic Nanostructures and Their Optical Properties VII, 73940H (2 September 2009); doi: 10.1117/12.827490
Show Author Affiliations
Tho D. Nguyen, Univ. of Utah (United States)
Ajay Nahata, Univ. of Utah (United States)
Z. Valy Vardeny, Univ. of Utah (United States)

Published in SPIE Proceedings Vol. 7394:
Plasmonics: Metallic Nanostructures and Their Optical Properties VII
Mark I. Stockman, Editor(s)

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