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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.