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Q: Fachverband Quantenoptik und Photonik

Q 18: Photon BEC

Q 18.8: Vortrag

Dienstag, 3. März 2026, 12:45–13:00, P 4

Ring Potentials for Photons in Dye-Filled Optical Microcavities — •Patrick Gertz, Leon Kleebank, Andreas Redmann, Kirankumar Karkihalli Umesh, Frank Vewinger, and Martin Weitz — Institute for Applied Physics, University of Bonn, Wegelerstraße 8, 53111 Bonn

Nanostructured dye-filled optical microcavities permit the study of quantum gases of light, while allowing precise experimental control over dimensionality, shape of the energy landscape and coupling to reservoirs. This enables the investigation of novel states of matter both in and out of equilibrium.

Here we report on the experimental implementation of a quantum gas of photons confined to a ring-shaped potential within such a material-filled microcavity, where the trapping potential is provided by static nanostructures, achieved by controlled laser-induced delamination of the dielectric coating of one of the cavity mirrors. We have achieved quasi-1D, periodically closed confinement of photon gases in ring potentials and performed measurements of the spatial and spectral distributions. Also, we observe macroscopic ground state occupation, giving preliminary evidence for Bose-Einstein condensation of photons in the system.

Keywords: Bose-Einstein condensation; Photon Condensate; Microcavities; Ring Potential