Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 49: Poster – Photonics, Lasers, and Applications
Q 49.31: Poster
Mittwoch, 12. März 2025, 17:00–19:00, Tent
Studying the transport of optical modes carrying OAM in coupled waveguides — •Max Weber1, Julian Schulz1, Christina Jörg1, and Georg von Freymann1,2 — 1Physics Department and Research Center OPTIMAS, RPTU Kaiserslautern-Landau, 67663 Kaiserslautern, Germany — 2Fraunhofer Institute for Industrial Mathematics ITWM, 67663 Kaiserslautern, Germany
In solid state physics, electrons are described by Bloch states, which contain a spin and an orbital angular momentum (OAM) degree of freedom. Due to the spin-orbit coupling, the Spin Hall Effect (SHE) is based on the more fundamental Orbital Hall Effect (OHE). The SHE is well known and widely studied. The importance of the OAM for transport processes has been neglected. To study this effect, the explicit example of a polarized tin-tellurium layer is used. To examine the transport phenomena that depend on the orbital degree of freedom, a model system of waveguides is created. By analogy of the Schrödinger equation and the Helmholtz equation, the coupling of the electrons in the atoms can be related to the coupling of the light in the waveguides. We use optical waveguide modes with OAM to examine how transport phenomena depend on the orbital degree of freedom. To show that the OAM is coupled to the momentum of the excited wave packet, the lattice is excited with a wave packet with positive and negative OAM. We observe a change in the group velocity of the wave packet when the sign of the input OAM is switched. Thus, the momentum and the OAM are coupled.
Keywords: waveguide; OAM; transport phenomena