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Article Dans Une Revue Journal of Physical Chemistry Letters Année : 2017

Strong Coupling between Self-Assembled Molecules and Surface Plasmon Polaritons

Résumé

We experimentally demonstrate strong coupling between self-assembled PTCDI-C7 organic molecules and the electromagnetic mode generated by surface plasmon polaritons (SPPs). The system consists of a dense self-assembly of ordered molecules evaporated directly on a thin gold film, which stack perpendicularly to the metal surface to form H-aggregates, without a host matrix. Experimental wavevector-resolved reflectance spectra show the formation of hybrid states that display a clear anticrossing, attesting the strong coupling regime with a Rabi splitting energy of ΩR ≃ 102 meV at room temperature. We demonstrate that the strength of the observed strong coupling regime derives from the high degree of organization of the dense layers of self-assembled molecules at the nanoscale that results in the concentration of the oscillator strength in a charge-transfer Frenkel exciton, with a dipole moment parallel to the direction of the maximum electric field. We compare our results to numerical simulations of a transfer matrix model and reach good qualitative agreement with the experimental findings. In our nanophotonic system, the use of self-assembled molecules opens interesting prospects in the context of strong coupling regimes with molecular systems.
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Dates et versions

hal-01664330 , version 1 (21-12-2017)

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John Bigeon, S. Le Liepvre, S. Vassant, Nadia Belabas, Nathalie Bardou, et al.. Strong Coupling between Self-Assembled Molecules and Surface Plasmon Polaritons. Journal of Physical Chemistry Letters, 2017, 8 (22), pp.5626 - 5632. ⟨10.1021/acs.jpclett.7b02586⟩. ⟨hal-01664330⟩
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