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Related Experiment Videos

Strong Coupling between Surface Plasmon Polaritons and Molecular Vibrations.

H Memmi1, O Benson1, S Sadofev1

  • 1Institut für Physik, Humboldt Universität zu Berlin, Newtonstrasse 15, 12489 Berlin, Germany.

Physical Review Letters
|April 8, 2017
PubMed
Summary

We achieved strong coupling between light and molecular vibrations in a novel organic-inorganic hybrid material. This plasmonic hybrid structure shows potential for advanced chemistry and optoelectronics applications.

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Area of Science:

  • Plasmonics
  • Molecular Spectroscopy
  • Materials Science

Background:

  • Surface plasmon polaritons (SPPs) are light-driven electron oscillations on metal surfaces.
  • Coupling SPPs with molecular vibrations can create new hybrid states with unique optical properties.

Purpose of the Study:

  • To investigate the strong coupling between SPPs and molecular vibrations in an organic-inorganic plasmonic hybrid structure.
  • To characterize the resulting hybrid states and their dependence on material properties.

Main Methods:

  • Fabrication of a hybrid structure with a ketone-based polymer on a silver layer.
  • Analysis of attenuated-total-reflection (ATR) spectra to study the dispersion relation.

Main Results:

Related Experiment Videos

  • Observed an anticrossing in the dispersion relation near the carbonyl stretch vibration.
  • Measured an energy splitting of up to 15 meV between the upper and lower polariton branches.
  • Found that the splitting depends on molecular layer thickness and saturates for thick films.

    • Conclusions:

    • Demonstrated strong coupling in a novel organic-inorganic plasmonic hybrid system.
    • The observed hybrid state has significant potential for applications in chemistry and optoelectronics.