Electrochemically-controlled metasurfaces with high-contrast switching at visible frequencies

Laura N. Liu

doi:10.1117/12.2623772

24 May 2022 Electrochemically-controlled metasurfaces with high-contrast switching at visible frequencies

Laura N. Liu

Proceedings Volume PC12130, Metamaterials XIII; PC121300L (2022) https://doi.org/10.1117/12.2623772
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Abstract

Recently in nanophotonics, a rigorous evolution from passive to active metasurfaces has been witnessed. This advancement not only brings forward new physical phenomena but also elicits opportunities for practical applications. However, active metasurfaces operating at visible frequencies often exhibit low performance due to design and fabrication restrictions at the nanoscale. In this work, we demonstrate electrochemically-controlled metasurfaces with high intensity contrast, fast switching rate, and excellent reversibility at visible frequencies. We employ a conducting polymer, polyaniline (PANI) that can be locally conjugated on preselected gold nanorods to actively control the phase profiles of the metasurfaces. The optical responses of the metasurfaces can be in situ monitored and optimized by controlling the PANI growth of subwavelength dimension during the electrochemical process. In particular, we showcase electrochemically-controlled anomalous transmission and holography with good switching performance. Such electrochemically powered optical metasurfaces lay a solid basis to develop metasurface devices for real-world optical applications.

Conference Presentation

Citation Download Citation

Laura N. Liu "Electrochemically-controlled metasurfaces with high-contrast switching at visible frequencies", Proc. SPIE PC12130, Metamaterials XIII, PC121300L (24 May 2022); https://doi.org/10.1117/12.2623772

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