Regensburg 2010 – scientific programme
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O: Fachverband Oberflächenphysik
O 83: Plasmonics and Nanooptics VII
O 83.7: Talk
Friday, March 26, 2010, 12:45–13:00, H32
Electromagnetic polarisation twisting mediated by plasmon / nanostructure interaction — •Brian Ashall1, Brian Vohnsen1, Stephan Schwieger2, Erich Runge2, Michael Berndt3, and Dominic Zerulla1 — 1School of Physics, University College Dublin, Dublin 4, Ireland. — 2Theoretical Physics I, Technische Universität Ilmenau, 98684 Ilmenau, Germany. — 3Max Planck Institute of Molecular Cell Biology and Genetics, 01307 Dresden, Germany.
The design and architecture of nanostructures for the purpose of controlling and manipulating Surface Plasmon Polariton (SPP) dynamics is currently a focal point of research. Here, we present the first instance of plasmon mediated polarisation reorientation observed in the farfield with no associated reemission directional change [1]. Specifically, it is demonstrated that, as a result of the interaction between SPPs and tailor designed nanostructures of 3-fold symmetry characteristics [2], a polarisation twisting of the SPP mediated reradiated light is attained. It is shown that the dynamics of such an interaction can be controlled externally, enabling active control of the out-going polarisation orientation. In order to further understand the origin of the processes involved, Green's function based simulations of the interactions are presented and confirm that the origin of the polarisation twisting can be explained via asymmetrical in-plane SPP scattering.
[1] B. Ashall, B. Vohnsen, M. Berndt, D. Zerulla; Phys. Rev. B, 80(20) (2009)
[2] B. Ashall, M. Berndt, D. Zerulla; Appl. Phys. Lett. 91(20), 203109 (2007)