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MON: Monday Contributed Sessions
MON 23: Poster Session: Fundamental Aspects and Model Systems
MON 23.24: Poster
Montag, 8. September 2025, 18:30–20:30, ZHG Foyer 1. OG
Photon Bose-Einstein Condensates: Polarization properties and tailored potential landscapes — •Sven Enns1, Julian Schulz1, Kirankumar Karkihalli Umesh2, Frank Vewinger2, and Georg von Freymann1,3 — 1Department of Physics and Research Center OPTIMAS, RPTU Kaiserslautern-Landau, 67663 Kaiserslautern, Germany — 2Institute of Applied Physics, University of Bonn, 53115 Bonn, Germany — 3Fraunhofer Institute for Industrial Mathematics ITWM, 67663 Kaiserslautern, Germany
We experimentally investigate polarization properties of harmonically trapped photon gases in a dye-filled microcavity and their dependence on the polarization of the pump beam. Our results demonstrate the interplay between the timescales of thermalization, rotational diffusion of the dye molecules and photon lifetime in the cavity. In agreement with previous theoretical work [1], we show that symmetry breaking occurs when stimulated emission becomes the dominating process.
Furthermore, we investigate photon gases in potential landscapes using the technology of Direct-Laser-Writing (DLW), a 3D laser lithography technology that enables the fabrication of three-dimensional polymer structures at the sub-micron scale. By printing these structures onto the cavity mirrors potential landscapes for the photon gas are created. This allows for the investigation of many fields, such as quantum thermodynamics [2] and properties of coupled photon gases.
[1] R. I. Moodie, P. Kirton, and J. Keeling, Phys. Rev. A 96 (2017).
[2] Karkihalli Umesh, K., J. Schulz, J. Schmitt, M. Weitz, G. von Freymann and F. Vewinger, Nature Physics 20, 1810-1815, (2024).
Keywords: Direct Laser Writing; quantum gas of light; Bose-Einstein condensation