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Dresden 2009 – scientific programme

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O: Fachverband Oberflächenphysik

O 38: Nano-optics of metallic and semiconducting nanostructures (experiments I)

O 38.9: Talk

Wednesday, March 25, 2009, 17:00–17:15, SCH A216

Nanostructure Symmetry Induced Surface Plasmon Propagation Guiding and Polarisation Twisting — •Brian Ashall and Dominic Zerulla — UCD Dublin, School of Physics, Dublin 4, Ireland

In a recent letter [1], we have demonstrated that symmetry properties of tailor designed nanostructures have a well defined impact on propagation characteristics of Surface Plasmon Polaritons (SPPs) excited on the nanostructured arrayed surfaces. Highlighted, were the SPP excitation, propagation and wave-guiding processes on the nanostructured arrays.
Building on these findings, more recent experiments have focused on the ability of 120 symmetric nanostructures to predictably twist the polarisation of the reemitted light with respect to the illumination polarisation.
This effect has been both, directly observed through polariser - analyser experiments, and indirectly observed as a shift in the polarisation at which the most efficient SPP confinement on the nanostructured surface occurs. The degree by which the polarisation can be twisted is a function of the geometry of the nanostructures, and as such is an initial free design parameter. The only apparent restriction for the efficiency of the polarisation twisting effect for a given nanostructured array are the SPP excitation conditions.
[1] B. Ashall, M. Berndt, D. Zerulla, Appl. Phys. Lett. 91, 203109 (2007).

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