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Proceedings Paper

Investigation of surface plasmonic extraordinary transmission for spectral, polarimetric and off-normal incidence
Author(s): Spencer R. Sellers; Jason C. Vap; Stephen E. Nauyoks; Michael A. Marciniak; Zahyun Ku
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Paper Abstract

Extraordinary transmission of surface plasmonic (SP) structures has been widely studied but lacking is a focus on the off-normal dependency of the resonant modes and how this affects the transmission spectrum. The measurements of offnormal spectral transmission for a SP structure were compared to finite-difference time-domain simulations. The SP sample is a gold/titanium thin film (50 nm) with a 2D square array of circular holes deposited on 1 μm of highly ndoped, n=2e18cm-3, gallium-arsenide (GaAs) upon a semi-insulating GaAs substrate. Spectral transmission measurements were taken for wavelengths from 2-12μm, incident elevation and azimuthal angles of θ=0°, 20° and 40°, and φ=0° and 45°, respectively, with linearly polarized and un-polarized light. The first and second-order surface plasmon modes and their dependency on θ, φ, polarization and the grating momentum vector were identified. The measurements and simulations corroborate the theoretical analysis, giving a closed-form solution to the spectral location of lower-order modes. For off-normal incidence in a plane parallel to the array periodicity (φ=0°), the (1,0) mode as defined for p-polarization splits while the (0,1) mode as defined for s-polarization, remains essentially un-changed for all θ. For φ=45° incidence, both polarizations split the modes. Full polarimetric spectral transmission was both measured and simulated, giving a Mueller matrix representation of the spectral transmission of the SP structure at θ=0° and 20° and φ=0° and 45°, demonstrating that this structure is moderately depolarizing when resonant. The results show the dependence on incident angle and polarization of the extraordinary transmission of SP structures.

Paper Details

Date Published: 9 October 2012
PDF: 14 pages
Proc. SPIE 8457, Plasmonics: Metallic Nanostructures and Their Optical Properties X, 84573K (9 October 2012); doi: 10.1117/12.929696
Show Author Affiliations
Spencer R. Sellers, Air Force Institute of Technology (United States)
Jason C. Vap, Air Force Institute of Technology (United States)
Stephen E. Nauyoks, Air Force Institute of Technology (United States)
Michael A. Marciniak, Air Force Institute of Technology (United States)
Zahyun Ku, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 8457:
Plasmonics: Metallic Nanostructures and Their Optical Properties X
Mark I. Stockman, Editor(s)

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