Berlin 2012 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 93: Poster Session: Metal-Semiconductor Hybrid Systems, Plasmonic Systems / Photonic Crystals / Carbon: Diamond & CNT / Quantum Information Systems

HL 93.4: Poster

Donnerstag, 29. März 2012, 16:00–19:00, Poster D

Optical Near Field Measurements on a Plasmonic Luneburg Lens — •Hoan Vu, Jens Ehlermann, Robert Blick, Detlef Heitmann, and Stefan Mendach — Institute of Applied Physics, University of Hamburg, Germany

We use a scanning near field optical microscope (SNOM) to investigate the interaction of surface plasmon polaritons (SPP) with dielectric nanostructures on gold films. For that purpose, a metal coated optical fiber with a 100 nm aperture is scanned over the samples surface in order to collect topographical and optical information simultaneously [1].

SPP properties, especially the propagation direction can be modified by varying the effective refractive index on the sample’s surface. This is predominately achieved using gray scale lithographic techniques to locally modulate the height of polymeric nanostructures [2].

We present near field measurements on a plasmonic Luneburg lens [3]. Depending on the wavelength this lens focuses the SPPs to different spots on the sample.

We gratefully acknowledge support by the DFG via the Graduiertenkolleg 1286.

[1] A. Lewis et al., Ultramicroscopy 13, 227-232 (1984)

[2] P. A. Huidobro et al., Nano Letters 10(6), 1985-1990 (2010)

[3] T. Zentgraf et al., Nature Nanotechnology 6, 151-155(2011)