Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 56: Plasmonics & Nanooptics IV: Materials Science and Chemistry Applications (joint session O/CPP)

O 56.6: Vortrag

Mittwoch, 3. April 2019, 16:15–16:30, H8

Electrochemistry on Copper Nanostructures for Active Plasmonics — •Annette Böhme, Florian Sterl, Elinor Kath, Monika Ubl, and Harald Gießen — 4th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany

Applications of active plasmonics include the development of advanced plasmonic color displays and switchable metasurfaces. We aim to fabricate plasmonic nanostructures that can be switched electrochemically by applying a voltage.

Copper is a suitable material for this attempt as it can easily be switched electrochemically between copper (Cu) and copper oxide (CuO/ Cu₂O) [1]. We have developed a manufacturing process to fabricate high-quality inverse copper nanostructures that exhibit well-modulated plasmonic resonances. We use these samples to perform cyclic voltammetry in order to switch them electrochemically, and at the same time we perform spectral reflectance measurements in the visible wavelength range. Thereby, we demonstrate that the resonances can be reversibly shifted by as much as 80 nm. The wavelength shift becomes stronger after several cycles of voltammetry which we attribute to the modification of the copper surface with repeated oxidation and reduction.

These results provide a basis for the future development of pixelated active plasmonic devices.

[1] Ye Wan, Yundian Zhang, Xianle Wang, and Qing Wang, Electrochem. Commun. 36, 99 (2013).