Berlin 2012 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 17: Plasmonic Systems
HL 17.1: Vortrag
Montag, 26. März 2012, 15:00–15:15, EW 203
Observation of plasmonic mirages — •Felix Bleckmann1, Johannes Lenz2, Nikolas Grünwald2, Stephan Irsen2, and Stefan Linden1 — 1Physikalisches Institut, Universität Bonn, Nußallee 12, 53115 Bonn, Germany — 2Research Center Caesar, Ludwig-Erhard-Allee 2, 53175 Bonn, Germany
Surface plasmon polaritons (SPPs) are electromagnetic waves propagating at the interface between a metal and an insulator. Recently, it has been demonstrated, that SPPs can be controlled by adding a dielectric film on top of the metal. The effective refractive index of the SPPs of such a three layer system depends on the thickness and the refractive index of the dielectric film. For PMMA on top of gold, the effective refractive index of the SPPs for near-infrared frequencies can be tuned between approximately 1.0 and 1.5 by changing the PMMA thickness from 0 nm to 200 nm.
Simple optical components like lenses and prisms can be fabricated by adding dielectric elements with constant thickness and appropriate shape on top of the metal. The local modification of the thickness of the dielectric film also allows for graded index profiles for propagating SPPs.
Here, we use grey-scale lithography to fabricated different functional elements for the manipulation of SPPs. We demonstrate that a dielectric gradient structure can be used to bend the propagation direction of a SPP mimicking the mirage effect.