Rostock 2019 – scientific programme

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MO: Fachverband Molekülphysik

MO 24: Large and Reactive Systems

MO 24.6: Talk

Friday, March 15, 2019, 11:45–12:00, S HS 002 Biologie

Infrared Emission from Thermally Excited Strongly Coupled Vibrational Transitions — •Marcus Seidel, Anoop Thomas, Thibault Chervy, Kalaivanan Nagarajan, Eloise Devaux, Cyriaque Genet, and Thomas W. Ebbesen — ISIS & icFRC, University of Strasbourg, CNRS, 67000 Strasbourg, France

The strong coupling of vibrational transitions to microcavity resonances has shown a decisive impact on chemical reactivity and likewise presents an exciting platform for studying quantum effects related to the light-matter hybridized quasi-particles, called vibro-polaritons [1,2]. Recently, first data was obtained from vibro-polariton thermal emission [3]. Here, we significantly extend this initial work. We present temperature and cavity tuning dependent emission measurements from strongly coupled liquids, namely diethyl sebacate and tetrachloroethylene. This results in better cavity tunability and an increased range of polariton excitation densities. Furthermore, we complement the experimental method by normal incidence reflection measurements and by employing microcavities with dielectric mirrors. The performed experiments lead to a reinterpretation of the previously reported results. In particular, we show that the investigated vibro-polaritonic states are thermalized and that polariton-polariton interactions cannot be readily extracted from the emission data. Our results are important for pioneering vibro-polariton interactions which are crucial for condensation of the quasi-particles. References: [1] T. W. Ebbesen, Acc. Chem. Res. 49, 2403 (2016). [2] D. S. Dovzhenko et al., Nanoscale 10, 3589 (2018). [3] T. Chervy et al., ACS Photon. 5, 217 (2018).