Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 23: Poster I

Q 23.11: Poster

Tuesday, March 12, 2024, 17:00–19:00, Tent B

Self-consistent Red Shift – an Alternative Feature of Light-matter Coupling? — •Jacob Horak, Dominik Sidler, Michael Ruggenthaler, and Angel Rubio — Max Planck Institute for the Structure and Dynamics of Matter and Center for for Free-Electron Laser Science, Luruper Chaussee 149, 22761 Hamburg, Germany

Polaritonic chemistry is a new field which was established when experiments showed a change in chemical reactivity merely due the different electromagnetic environment inside an optical cavity. The effect is attributed to the formation of hybrid particles, polaritons, made up of a molecular excitation strongly coupled to the resonance mode of a cavity. Compared to an empty cavity, resonances are always shifted depending on the filling and this has been used to monitor the progress of reactions, e.g, with IR spectroscopy.[1]

Here, we show that an analytic expression of the self-consistent red shift derived from the Pauli-Fierz Hamiltonian for harmonic molecules deviates from the Lorentz model. Traditionally, observing a Rabi split, i.e., the energy separation between the polaritons, has been the hallmark of experimentally quantifying light-matter coupling. Could measuring the red shift become another avenue to monitor strong light-matter coupling experimentally?

[1] A. Thomas, J. George, A. Shalabney, M. Dryzhakov, S. J. Varma, J. Moran, T. Chervy, X. Zhong, E. Devaux, C. Genet, J. A. Hutchison, T. W. Ebbesen, Angew. Chem. Int. Ed. 2016, 55, 11462-11466.

Keywords: cavity; QED; polariton; polaritonic chemistry; light-matter coupling