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O: Fachverband Oberflächenphysik
O 76: Plasmonics and Nanooptics V: Tunable Structures and Nanoparticles (joint session O/CPP)
O 76.5: Vortrag
Mittwoch, 18. März 2020, 16:30–16:45, WIL A317
Polarization-selective orbital angular momentum multiplexed meta-hologram — •Basudeb Sain1, Hongqiang Zhou2, Yongtian Wang2, Christian Schlickriede1, Lingling Huang2, and Thomas Zentgraf1 — 1Department of Physics, Paderborn University, Warburger Straße 100, 33098 Paderborn, Germany — 2School of Optics and Photonics, Beijing Institute of Technology, Beijing, 100081, China
Metasurface holography has the advantage of realizing complex wavefront modulation together with the progressive technique of computer-generated holographic imaging. Despite of having the well-known light parameters, like amplitude, phase, polarization and frequency, the orbital angular momentum (OAM) of a beam can be regarded as another important degree of freedom. Utilizing the orthogonality between different OAM modes and the OAM conservation law, here, we demonstrate orbital angular momentum multiplexed polarization-encrypted holography using a birefringent metasurface. The polarization selectivity of such metasurface relies on the birefringent response of the incident light. The holographic information can only be reconstructed with exact topological charge and a specific polarization state, providing an unprecedented advantage for holographic encryption. By using an incident beam with different topological charges as erasers, we mimic a super-resolution case for the reconstructed image, in analogy to the well-known stimulated emission depletion (STED) technique in microscopy. Such technique can open new avenues for beam shaping, optical camouflage, data storage, and dynamic displays.