Dresden 2026 – scientific programme
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O: Fachverband Oberflächenphysik
O 49: Plasmonics and nanooptics: Light-matter interaction, spectroscopy I
O 49.1: Talk
Tuesday, March 10, 2026, 14:30–14:45, HSZ/0403
Beyond-Dipole Approaches to Generating and Applying Twisted Light — •Esra Ilke Albar1, Franco Bonafé1, Valeriia Kosheleva1, Heiko Appel1, and Angel Rubio1,2 — 1Max-Planck-Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, DE — 2Center for Computational Quantum Physics (CCQ), The Flatiron Institute, 162 Fifth Avenue, New York, New York 10010, USA
We perform numerical electrodynamics simulations where a nanoplasmonic Archimedean spiral is targeted with a circularly polarized, 8-cycle plane wave pulse to probe the generation of twisted pulses, i.e., fields with orbital angular momentum(OAM). We identify mismatches between the generated pulse and the ideal OAM beams, which motivates us to discuss the spatiotemporal optical vortices (STOVs). All realistic electromagnetic fields are finite pulses, while the structural properties of plasmonic OAM generators are often adjusted to the central wavelength. As a next step, we employ a two-particle point charge system to map the local OAM density and confirm the space dependence of the generated pulse. This pushes us to expand beyond the known electric dipole approximation(EDA). We introduce our beyond dipole formalism and present high harmonic generation results computed within this approach.
Keywords: Optical Vortex Generation; Spatiotemporal structuring of Light; Orbital Angular Momentum of Light; Nanoplasmonic Structures for Light Shaping; High Harmonic Generation