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O: Fachverband Oberflächenphysik

O 33: Poster Session - Plasmonics and Nanooptics: Applications and other Aspects

O 33.11: Poster

Monday, March 16, 2020, 18:15–20:00, P1C

Switchable plasmonic metasurfaces using the polymer PEDOT — •Juliane Ratzsch, Tobias Pohl, Andy Steinmann, Florian Sterl, Jinglin Fu, Mario Hentschel, and Harald Giessen — 4th Physics Institute, University of Stuttgart, Germany

Metasurfaces offer a wide range of interesting applications, such as metalenses, beam steering, and holograms. We have realized an electrochemically switchable metasurface, using plasmonic gold nanoantennas covered with the polymer PEDOT.

PEDOT changes its refractive index upon oxidation and reduction, and thus shifts the resonance of the nanoantenna array. This is achieved by applying small voltages in the range of -1V to 1V, and is reversible over many cycles. This enables us to switch on and off the desired functionality of the metasurface, which is designed to perform at a specific wavelength.

We have achieved a resonance shift of 130 nm, at switching times in the order of 10 seconds. This will enable us to apply this concept to a beam-steering metasurface, designed with the geometric phase approach, and thus realize an electrically switchable microscale beam-steering device.