SKM 2023 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 7: Organic Semiconductors (joint session HL/CPP)
CPP 7.5: Talk
Monday, March 27, 2023, 10:45–11:00, POT 251
Ultrastrong light-matter coupling of J-aggregated squaraine in a room temperature open cavity — •Christoph Bennenhei1, Lukas Lackner1, Moritz Gittinger1, Heiko Knopf2, Falk Eilenberger2, Jennifer Zablocki3, Arne Lützen3, Martin Silies1, Christoph Lienau1, Martin Esmann1, and Christian Schneider1 — 1Institute of Physics, University of Oldenburg — 2Fraunhofer-Institute for Applied Optics and Precision Engineering IOF, Jena — 3Kekulé Institute of Organic Chemistry and Biochemistry, University of Bonn
Organic molecule exciton-polaritons in artificial lattices are an emerging platform to emulate complex electronic Hamiltonians at ambient conditions. We present J-aggregated squaraine dye (SQ) thin films [1] as a promising candidate for exciton-polaritons in optical cavities due to the high oscillator strength and tunable resonance. Using white light reflection spectroscopy, we demonstrate tunable ultrastrong coupling of light to the SQ thin film in an open cavity at room temperature [2] which we support by transfer matrix calculations. In ongoing experiments, we introduce structured photonic lattices to the open cavity to investigate the coupling of the polaritons to tailored potential landscapes. [1] M. Schulz, et al., Nat Commun 9, 2413 (2018). [2] L. Lackner, et al., Nat Commun 12, 4933 (2021).