Mainz 2026 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 45: Plasmonics and Metasurfaces

Q 45.5: Talk

Thursday, March 5, 2026, 12:15–12:30, P 3

Interaction of Structured Light with Nanostructured Matter — •Noah Apostolico, Leander Siegle, Luca Schmid, Tim-Dominik Gómez, Mario Hentschel, and Harald Giessen — 4th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany

Although structured light has been extensively studied, its interaction with nanoscale matter has remained largely unexamined. Here, we demonstrate a symmetry-dependent interaction between structured light and nanostructured absorbers by investigating the orbital-angular-momentum-dependent extinction of gold nanodisk oligomers. Using a rigorous design framework, we fabricate diffractive optical elements via two-photon-polymerization grayscale lithography to generate three distinct flower-like beam modes. Scanning these beams across oligomers of different symmetries reveals that extinction is maximized when the beam and structure share the same rotational symmetry and reduced otherwise. A semi-analytical overlap model reproduces the observed trends with deviations consistently below 10%, confirming the robustness of the symmetry-based interaction mechanism.

Keywords: Structured Light; Nanophotonics; Light-Matter Interaction; 3D Printing