Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 76: Plasmonics & Nanooptics V: Nanostructures and Nanoantennae
O 76.4: Vortrag
Donnerstag, 4. April 2019, 11:15–11:30, H8
Plasmonic resonators in 1D and 2D: quality factor of resonances and near-fields — •Manuel Gonçalves1, Gregor Neusser2, Christine Kranz2, and Othmar Marti1 — 1Ulm University - Institute of Experimental Physics, Ulm, Germany — 2Ulm University - Institute of Analytical and Bioanalytical Chemistry, Ulm, Germany
Plasmonic particles present broad optical reasonances and reach therefore only small Q-factors. In many applications where narrow resonances are required 1-dimensional multilayered metal-dielectric films and periodically arranged 2-dimensional nanostructures can form resonators performing much better than single particles. The design of theses resonators can be optimized for reflectance and/or transmittance sensing applications, or for large near-field enhancement. We show how 1D multilayered metal-dielectric thin films with quality factors over 100 can be fabricated. We also have fabricated 2D nanostructures based on deep grooves milled in crystalline metal films, which achieve large Q-factors, strongly confine light at the grooves and simultaneously present remarkable dependence of the reflectance on the polarization of the incident light. We present experimental results as well as simulations.