Dresden 2020 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 33: Poster Session - Plasmonics and Nanooptics: Applications and other Aspects
O 33.10: Poster
Montag, 16. März 2020, 18:15–20:00, P1C
Nonreciprical Polarization Encryption of Holographic Images by Plasmonic Metasurfaces — •Daniel Frese1, Qunshuo Wei2, Yongtian Wang2, Lingling Huang2, and Thomas Zentgraf1 — 1Paderborn University, Warburger Str. 100, 33098 Paderborn, Germany — 2Beijing Institute of Technology, 100081, Beijing, China
Metasurfaces provide high flexibility in tailoring optical wavefronts within subwavelength dimensions. However, two-dimensional metasurfaces consisting of nanostructures exhibit only weak spatial asymmetry perpendicular to the surface. Hence, the transmission properties are the same if one illuminates the metasurface from the front or the backside. To realize asymmetric transmission properties, we designed and fabricated a metasurface hologram consisting of two stacked layers of plasmonic meta-atom arrays, which allows full spatial phase and amplitude control of the transmitted light. The pixel-by-pixel encoded Fourier-hologram appears in a particular linear cross-polarization channel and disappears if one flips the sample around, illuminating the metasurface from the backside. This concept opens up new possibilities in information processing, designing security features, as well as nonreciprocal polarization optics.