SKM 2023 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 33: Poster II
HL 33.30: Poster
Mittwoch, 29. März 2023, 17:00–19:00, P1
Optical Beamsplitter for Orbital Angular Momentum Modes — •Rebecca Aschwanden1, Bernhard Reineke2, Lingling Huang3, Klaus D. Jöns1, Tim Bartley1, and Thomas Zentgraf1 — 1Department of Physics, Paderborn University, Paderborn, Germany — 2Institute for Photonic Quantum Systems PhoQS, Paderborn University, Paderborn, Germany — 3Beijing Institute of Technology, Beijing, China
Metasurfaces consist of periodically arranged antennas of subwavelength dimensions that allow for specifically engineered functionalities and interaction with the incident light beam. They cannot only be used to replace conventional bulk optical elements but also to provide new functionalities. Here, we present the design and fabrication of a dielectric metasurface acting as a beamplitter with multiple output ports for orbital angular momentum (OAM) states. The dielectric metasurface consists of silicon nanofins which are fabricated by electron beam lithography and etching. We show that the metasurface splits the beam containing a superposition of OAM states into four spatially separated output directions.