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Strong coupling between surface plasmons and excitons in an organic semiconductor.

J Bellessa1, C Bonnand, J C Plenet

  • 1Laboratoire de Physique de la Matière condensée et Nanostructures, CNRS UMR 5586, Univ. Lyon-1, Villeurbanne 69622, France. bellessa@lpmcn.univ-lyon.fr

Physical Review Letters
|August 25, 2004
PubMed
Summary

Researchers observed strong coupling between surface plasmons and excitons in organic semiconductors. This plasmon-exciton coupling, evidenced by anticrossing dispersion lines, creates mixed states with significant Rabi splitting.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Optoelectronics

Background:

  • Organic semiconductors exhibit unique optical properties.
  • Surface plasmons are collective electron oscillations on metal surfaces.
  • Excitons are bound electron-hole pairs in semiconductors.

Purpose of the Study:

  • To investigate the strong coupling between surface plasmons and excitons in an organic semiconductor.
  • To characterize the resulting mixed states and their optical properties.

Main Methods:

  • Reflectometry experiments were conducted on cyanide dye J aggregates deposited on a silver film.
  • Analysis of dispersion lines to identify anticrossing behavior.
  • Measurement of Rabi splitting and emission spectra.

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Main Results:

  • Observation of anticrossing in dispersion lines, indicating strong plasmon-exciton coupling.
  • Formation of mixed states analogous to polaritons in microcavities.
  • Rabi splitting reached 180 meV at room temperature.
  • Observed emission from the low-energy mixed state, significantly shifted from the uncoupled emission.

Conclusions:

  • Strong coupling between surface plasmons and excitons in organic semiconductors is achievable.
  • This coupling leads to the formation of novel mixed states with significant energy shifts.
  • The findings have implications for developing new optoelectronic devices and understanding light-matter interactions in organic materials.