Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 69: Plasmonics and Nanooptics VI: Light-Matter Interactions and Characterisation

O 69.6: Vortrag

Mittwoch, 22. März 2017, 11:45–12:00, TRE Ma

Design and fabrication of metasurfaces with high polarization sensitivity on top of crystalline gold plates — •Manuel Gonçalves¹, Vaishnavi Rao¹, Gregor Neusser², Christine Kranz², Boris Mizaikoff², and Othmar Marti¹ — ¹Institute of Experimental Physics, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany — ²Institute of Analytical and Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany

Metasurfaces emerged in the last 10 years as one of the most successful realizations of plasmonic metamaterials. The two-dimensional geometrical arrangement of sub-wavelength plasmonic and dielectric nanostructures permits to use metasurfaces in a variety of ways: transformation of the polarization of light beams, beam focusing, holography, generation of structural colors. The units constituting plasmonic metasurfaces are tailored based on the plasmonic properties of single, or coupled particles. Among the several lithography techniques used for fabrication, focused ion-beam (FIB) is best indicated for milling crystalline films and particles, due to the accuracy achieved.

We have investigated the optical properties of grooves milled in crystalline gold plates and have designed a metasurface to be used in reflection using several groove elements. Due to the large sensitivity of the plasmonic absorption on the polarization of the light irradiating the grooves, the metasurface can be used as a polarization sensitive optical filter for specific bands in the visible and NIR spectrum.