e-journal
Ultrastrongly Coupled Exciton–Polaritons in Metal-Clad Organic Semiconductor Microcavities
Ultrastrong exciton–photon coupling of Frenkel molecular excitons is demonstrated at room temperature in a metal-clad microcavity containing a thin fi lm of 2,7-bis[9,9-di(4-methylphenyl)-fl uoren-2-yl]-9,9-di(4-methylphenyl)fl uorene.
A giant Rabi splitting of Ω ∼ 1 eV is measured using angle-resolved refl ectivity and bright photoluminescence is observed from the lower polariton branch.To obtain the virtual photon and exciton content of the polariton ground
state, the results are interpreted in terms of the full Hopfi eld Hamiltonian,including anti-resonant terms. Also included is an analytical treatment of the often ignored and sometimes misinterpreted TM-polarized metal–insulator–
metal plasmon–polariton.
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