Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 71: Poster: Plasmonics and Nanooptics

O 71.17: Poster

Wednesday, March 20, 2024, 18:00–20:00, Poster D

Investigation of lithiated carbon as active plasmonic material system — •Valentin Maile, Mario Hentschel, and Harald Giessen — 4th Physics Institute, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany

Active plasmonic structures are a key component in the recent advances in optical technologies due to their ability to confine and manipulate light on the nano-scale and thus aid the miniaturization of optical devices. A key component for future devices is switchabilty and tunability of the optical resonances. Recently, the electrically switchable metal-to-insulator transition of the organic conjugated polymer PEDOT: PSS was used to realize switchable plasmonic devices at up to 30Hz modulation speed. Here, we introduce a different concept based on lithium-intercalated carbon, a material system known from battery research. The reversible lithium intercalation in the carbon lattice causes an increase of charge carrier density and thus a change in the optical properties of the material, its color changing from black to golden, rendering it an interesting material system for switchable plasmonic nanostructures. In this work, lithiated forms of carbon and their change in optical properties are explored as a possible switchable material system for plasmonic nanostructures. This ansatz expands the toolkit of active plasmonic structures for metasufaces and nanooptics.