Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 34: Plasmonics and nanooptics: Light-matter interaction, spectroscopy III

O 34.1: Talk

Tuesday, March 13, 2018, 14:00–14:15, MA 041

Towards near-field coupling of surface plasmon polaritons across sub-micrometer gaps — •Vladimir Smirnov, Sven Stephan, Heiko Kollmann, Jue-Min Yi, Christoph Lienau, and Martin Silies — Institute of Physics and Center of Interface Science, Carl von Ossietzky Universität Oldenburg, Germany

Efficient nanofocusing of light is one of the major tasks for the realization of an ultrafast, all-optical switch. For this purpose, Surface Plasmon Polaritons (SPP) need to be confined in a conical metallic stripe-like antenna to nm-dimensions using a curved grating coupler with a second conical antenna at a nanometer distance acting as a receiver.

Here, we study the propagation of SPPs using far-field confocal microscopy in a 200 nm thin Au film in a tapered waveguide geometry across gaps of down to 15 nm that are fabricated using the Focused Ion Beam-based "Sketch and Peel" technique [1]. For gap sizes smaller than 30 nm, the transmitted intensity abruptly increases indicating an enhanced energy transport through near-field coupling [2], in accordance with finite difference time domain calculations. Results of the present work are of interest in the field of efficient strong coupling of plasmons and excitons towards ultrafast optical switching.

[1] Y. Chen, et al., ACS Nano 10(12), pp 11228-11236 (2016)

[2] H. Kollmann, et al., Nano Lett 14(2), pp 4778-4784 (2014)