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Exciton-plasmon-photon conversion in plasmonic nanostructures.

Y Fedutik1, V V Temnov, O Schöps

  • 1Fachbereich Physik, Universität Dortmund, Otto-Hahn-Strasse 4, 44227 Dortmund, Germany.

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|October 13, 2007
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Summary

Researchers optimized a silver-nanowire cavity with cadmium selenide (CdSe) nanocrystals to study cavity quantum electrodynamics. They achieved efficient exciton-plasmon-photon conversion and guiding, demonstrating a modified spontaneous emission rate.

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Area of Science:

  • Nanophotonics and Quantum Optics
  • Materials Science

Background:

  • Cavity quantum electrodynamics (cQED) explores light-matter interactions within resonant cavities.
  • Silver nanowires offer unique plasmonic properties for nanoscale optical devices.
  • Cadmium selenide (CdSe) nanocrystals are quantum dots with tunable optical properties.

Purpose of the Study:

  • To optimize a silver-nanowire cavity functionalized with CdSe nanocrystals for cQED.
  • To investigate the influence of nanocrystal-nanowire distance (d) and cavity length (L) on cQED.
  • To demonstrate efficient exciton-plasmon-photon conversion and guiding.

Main Methods:

  • Fabrication of a silver-nanowire cavity system incorporating CdSe nanocrystals.
  • Systematic variation of the distance (d) between nanocrystals and nanowire.
  • Systematic variation of the cavity length (L).
  • Analysis of nanocrystal emission modulation by cavity modes.

Main Results:

  • Derivation of a plasmon group velocity (vgr) of approximately 0.5c from emission modulation.
  • Demonstration of efficient exciton-plasmon-photon conversion and guiding along the nanowire.
  • Observation of modified spontaneous emission rates in the coupled exciton-plasmon system.

Conclusions:

  • The optimized silver-nanowire/CdSe nanocrystal system is a promising platform for cQED studies.
  • The findings highlight the potential for controlling light-matter interactions at the nanoscale.
  • This work contributes to the development of novel optoelectronic and quantum information devices.