Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 50: Poster Session - Plasmonics and Nanooptics: Fabrication and Characterization
O 50.4: Poster
Tuesday, March 17, 2020, 18:15–20:00, P2/EG
Fabrication and near-field characterisation of plasmonic chiral couplers — •Hans-Joachim Schill, Mike Prämassing, and Stefan Linden — Physikalisches Institut Universität Bonn, D-53115
For particularly designed on-chip coupling structures the polarization properties of incident free-space radiation can steer the propagation direction in plasmonic waveguides.1 Here we investigate an approach based on optical spin-orbit coupling utilizing a circularly polarized laser beam. Different planar coupler geometries, fabricated by focused ion beam milling and electron beam lithography are studied in order to yield switchable directional coupling depending on the helicity of the incident light. As a tool to investigate the properties and functionality of individual couplers we use scattering type scanning near-field optical microscopy (s-SNOM), where a sharp metallic tip is raster-scanned over the sample and scatteres the nearfield signal into the farfield. The obtained spatially resolved amplitude- and phase-information, reveal the intensity and propagation direction of the surface plasmon polaritons (SPPs). The experimental near-field measurements are compared with finite element simulations.
[1] Y. Lefier, T. Grosjean, Opt. Lett. 40, 2890-2893 (2015)