Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 30: Plasmonics and Nanooptics III
O 30.3: Vortrag
Dienstag, 12. März 2013, 11:00–11:15, H31
Manipulation of Airy surface plasmon beams — •Felix Bleckmann1, Alexander Minovich2, Jakob Frohnhaus1, Dragomir N. Neshev2, and Stefan Linden1 — 1Physikalisches Institut, Universität Bonn, Nuassllee 12, 53115 Bonn, Germany — 2Nonlinear Physics Centre and Centre for Ultrahigh-bandwidth Devices for Optical Systems (CUDOS), Research School of Physics and Engineering, The Australian National University, ACT 0200, Canberra, Australia
Airy plasmons are electromagnetic waves propagating at the interface of a metal and an insulator. In contrast to Gaussian shaped surface plasmons, Airy plasmons are diffractive-free and offer a self-healing behavior. We demonstrate that the propagation of Airy plasmons can be manipulated by adding a supplemental dielectric on top of the metal. More specifically, with controlled variation of the dielectric height a linear gradient of the effective index is producible. The trajectory of Airy plasmons can be controlled this way while preserving their unique non-diffractive properties.
Here, we use negative-tone grey-scale electron beam lithography to fabricate these GRIN plasmonic structures made of PMMA on top of a gold film. The bending of Airy surface plasmons due to the gradient of the effective refractive index is observed by leakage radiation microscopy. Our experimental results are in good agreement with numerical calculations.