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Q: Fachverband Quantenoptik und Photonik
Q 25: Poster – Cold Atoms and Molecules, Matter Waves (joint session Q/A/MO)
Q 25.48: Poster
Dienstag, 11. März 2025, 14:00–16:00, Tent
Laser-induced lattice potentials for optical quantum gases inside microcavities — •Purbita Kole1, Nikolas Longen1, Daniel Ehrmanntraut1, Peter Schnorrenberg1, Kevin Peters1, and Julian Schmitt1,2 — 1Universität Bonn, IAP, Wegelerstr. 8, 53115 Bonn — 2Universität Heidelberg, KIP, Im Neuenheimer Feld 227, 69120 Heidelberg
Lattice potentials provide a fundamental ingredient for the description and study of the behaviour of particles in crystal-like structures, most notably in condensed matter systems. The realisation of photon Bose-Einstein condensates in arrays of coupled dye-filled microcavities opens a new platform for such physics owing to the high degree of tunability of the potentials in 1D and 2D. Here, we present laser-induced reversible and irreversible mirror structuring techniques for the generation of periodic lattice potentials for photon Bose-Einstein condensates with variable site-resolved control of the potential energy. As the dispersion relation for the two-dimensional photon gas inside an optical dye-filled microcavity depends on the cavity length, static potentials are introduced by modulating the mirror surface with a laser writing method. Harnessing the thermo-optic effect in the dye solution, we then modify the optical path length in a reversible way by projecting structured light onto an absorbing Si-layer in the backside of one of the cavity mirrors. The two-fold tuning of lattice potentials opens the possibility to study a variety of novel Hermitian and non-Hermitian effects with quantum gases of light.
Keywords: Microstructures; Laser writing; Optical cavities; Lattice Potentials; Bose-Einstein condensates