Regensburg 2025 – scientific programme

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DS: Fachverband Dünne Schichten

DS 9: Optical Analysis of Thin Films II

DS 9.3: Talk

Thursday, March 20, 2025, 10:45–11:00, H3

Structured Light Microscopy for Optical and Topological Characterization — •Denis Ukolov, Polina Gromova, and Peter Lemmens — IPKM, TU-BS, Braunschweig, Germany

Structured light beams with orbital angular momentum (OAM) are applied to study topological properties of thin films and metasurfaces. Using a laser confocal microscope with integrated interferometry, we investigate phase distributions and topological features of chiral structures.

Experimental data are compared with simulations to understand the interaction of OAM with surface geometry and its topological effects. This method offers a novel approach to characterizing surface properties in complex systems.

Work supported by DFG EXC-2123 QuantumFrontiers - Light and Matter 390837967.

Keywords: structured light; OAM beams; topology; metasurfaces; interferometry