Photonics, Volume 8, Issue 2 (February 2021) – 37 articles
Cover Story (view full-size image): Topological insulators (TIs) yield superior plasmonic properties in the ultraviolet-to-visible wavelength range for both near- and far-field applications. However, previous reports have demonstrated only inefficient wavefront control and non-directional surface–plasmon–polariton (SPP) excitation. This paper numerically investigates both near- and far-field wavefront manipulation capabilities of plasmonic TI Bi2Te3-based gap–surface plasmon (GSP) metasurfaces. By employing the principle of the geometric phase, a beam steering metasurface is presented with a cross-polarization efficiency of 34% at 500 nm. Additionally, near-field functionalities are demonstrated by designing a polarization-dependent GSP metasurface for directional SPP coupling. Our work forms a framework for TI-based GSP metasurfaces with near- and far-field functionalities in the visible wavelength range. View this paper.
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