Role of cylindrical surface plasmons in enhanced transmission

Michael I. Haftel; Carl Schlockermann; Girsh Blumberg

doi:10.1117/12.678515

30 August 2006 Role of cylindrical surface plasmons in enhanced transmission

Michael I. Haftel, Carl Schlockermann, Girsh Blumberg

Proceedings Volume 6323, Plasmonics: Metallic Nanostructures and their Optical Properties IV; 63230K (2006) https://doi.org/10.1117/12.678515
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

Abstract

We simulate the optical fields and optical transmission through nanoarrays of silica rings embedded in thin gold films using the finite-difference-time-domain (FDTD) method. By examining the optical transmission spectra for varying ring geometries we uncover large enhancements in the transmission at wavelengths much longer than the usual cutoffs for cylindrical apertures or where surface plasmons or other periodic effects from the array could play a role. We attribute these enhancements to closely coupled cylindrical surface plasmons on the inner and outer surfaces of the rings, and this coupling is more efficient as the inner and outer ring radii approach each other. We confirm this hypothesis by comparing the transmission peaks of the simulation with those deduced from cylindrical surface plasmon (CSP) dispersion curves obtained from a normal mode analysis. These theoretical peak positions and their dependence on the ring geometry are in close agreement with the simulations. The behavior of the CSP dispersion is such that propagating modes can be sent through the rings for ever longer wavelengths as the ring radii approach, whereas the transmission decreases only in proportion to the ring area.

Citation Download Citation

Michael I. Haftel, Carl Schlockermann, and Girsh Blumberg "Role of cylindrical surface plasmons in enhanced transmission", Proc. SPIE 6323, Plasmonics: Metallic Nanostructures and their Optical Properties IV, 63230K (30 August 2006); https://doi.org/10.1117/12.678515

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KEYWORDS

Surface plasmons

Chromium

Dielectrics

Gold

Metals

Silica

Finite-difference time-domain method

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