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Near- and Far-Field Excitation of Topological Plasmonic Metasurfaces

Topological-Insulator-Based Gap-Surface Plasmon Metasurfaces

Chair in Hybrid Nanosystems, Nanoinstitute Munich, Faculty of Physics, Ludwig-Maximilians-Universität München, 80539 München, Germany
Department of Physics, Imperial College London, London SW7 2AZ, UK
MQ Photonics Research Centre, Department of Physics and Astronomy, Macquarie University, Macquarie Park, NSW 2109, Australia
Author to whom correspondence should be addressed.
Photonics 2021, 8(2), 40;
Received: 30 December 2020 / Revised: 29 January 2021 / Accepted: 1 February 2021 / Published: 4 February 2021
(This article belongs to the Special Issue Plasmonic Metasurfaces)
Topological insulators (TIs) have unique highly conducting symmetry-protected surface states while the bulk is insulating, making them attractive for various applications in condensed matter physics. Recently, topological insulator materials have been tentatively applied for both near- and far-field wavefront manipulation of electromagnetic waves, yielding superior plasmonic properties in the ultraviolet (UV)-to-visible wavelength range. However, previous reports have only demonstrated inefficient wavefront control based on binary metasurfaces that were digitalized on a TI thin film or non-directional surface plasmon polariton (SPP) excitation. Here, we numerically demonstrated the plasmonic capabilities of the TI Bi2Te3 as a material for gap–surface plasmon (GSP) metasurfaces. By employing the principle of the geometric phase, a far-field beam-steering metasurface was designed for the visible spectrum, yielding a cross-polarization efficiency of 34% at 500 nm while suppressing the co-polarization to 0.08%. Furthermore, a birefringent GSP metasurface design was studied and found to be capable of directionally exciting SPPs depending on the incident polarization. Our work forms the basis for accurately controlling the far- and near-field responses of TI-based GSP metasurfaces in the visible spectral range. View Full-Text
Keywords: topological insulator; gap–surface plasmon metasurface; Bi2Te3; MIM metasurface; beam steering; SPP excitation topological insulator; gap–surface plasmon metasurface; Bi2Te3; MIM metasurface; beam steering; SPP excitation
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MDPI and ACS Style

Aigner, A.; Maier, S.A.; Ren, H. Topological-Insulator-Based Gap-Surface Plasmon Metasurfaces. Photonics 2021, 8, 40.

AMA Style

Aigner A, Maier SA, Ren H. Topological-Insulator-Based Gap-Surface Plasmon Metasurfaces. Photonics. 2021; 8(2):40.

Chicago/Turabian Style

Aigner, Andreas, Stefan A. Maier, and Haoran Ren. 2021. "Topological-Insulator-Based Gap-Surface Plasmon Metasurfaces" Photonics 8, no. 2: 40.

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