SKM 2023 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 26: Interface Controlled Properties and Nanomaterials: Grain Boundaries and Stability, Spectroscopy and Interatomic Potentials
MM 26.7: Vortrag
Mittwoch, 29. März 2023, 12:00–12:15, SCH A 216
Spin-orbit interactions in plasmonic crystals probed by site-selective cathodoluminescence spectroscopy — Masoud Taleb1, •Mohsen Samadi1, Fatemeh Davoodi1, Maximilian Black1, Janek Buhl2, Hannes Lüder2, Martina Gerken2, and Nahid Talebi1,3 — 1Institute of Experimental and Applied Physics, Kiel University, Germany — 2Integrated Systems and Photonics, Faculty of Engineering, Kiel University, Germany — 3Kiel, Nano, Surface, and Interface Science, Kiel University, Germany
The study of spin-orbit coupling (SOC) of light is crucial to explore the light-matter interactions in sub-wavelength nanostructures with broken symmetries. Herein, we explore the SOC in a plasmonic crystal, both theoretically and experimentally. Cathodoluminescence (CL) spectroscopy combined with the numerically calculated photonic band structure reveals an energy band splitting that is ascribed to the behavior of light in the plasmonic crystal where the inversion symmetry is locally broken. By shifting the impact position of the electron beam throughout a unit cell of the plasmonic crystal, we show that the emergence of the energy band splitting strongly depends on the excitation position of the surface plasmon (SP) waves on the crystal. Moreover, we exploit angle-resolved CL and dark-field polarimetry to demonstrate polarization-dependent scattering of SP waves interacting with the plasmonic crystal. Our study gives insight into the design of novel plasmonic devices with polarization-dependent directionality of the Bloch plasmons.