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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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Strong Coupling between Self-Assembled Molecules and Surface Plasmon Polaritons.

J Bigeon1, S Le Liepvre2, S Vassant2

  • 1Centre de Nanosciences et de Nanotechnologies, CNRS, Université Paris-Sud, Université Paris-Saclay , C2N Marcoussis, 91460 Marcoussis, France.

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We achieved strong coupling between organic molecules and surface plasmon polaritons (SPPs) using self-assembled PTCDI-C7 molecules. This nanoscale organization enhances light-matter interactions for advanced nanophotonic systems.

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Area of Science:

  • Nanophotonics
  • Organic Electronics
  • Plasmonics

Background:

  • Strong coupling is crucial for advanced light-matter interactions.
  • Surface plasmon polaritons (SPPs) offer unique electromagnetic confinement.
  • Organic molecules can exhibit unique optical properties when organized.

Purpose of the Study:

  • To demonstrate strong coupling between self-assembled PTCDI-C7 molecules and SPPs.
  • To investigate the role of molecular organization in achieving strong coupling.
  • To explore the potential of self-assembled organic molecules in nanophotonic systems.

Main Methods:

  • Experimental wavevector-resolved reflectance spectroscopy.
  • Fabrication of dense, ordered PTCDI-C7 molecular layers on gold films.
  • Numerical simulations using a transfer matrix model.

Main Results:

  • Demonstrated strong coupling with a Rabi splitting energy of 102 meV at room temperature.
  • Observed hybrid states with clear anticrossing in reflectance spectra.
  • Attributed strong coupling to nanoscale molecular organization and charge-transfer Frenkel excitons.

Conclusions:

  • Self-assembled PTCDI-C7 molecules enable strong coupling with SPPs.
  • Nanoscale molecular organization is key to concentrating oscillator strength.
  • This approach offers promising prospects for molecular nanophotonics.