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Microcavity-controlled single-molecule fluorescence.

Mathias Steiner1, Frank Schleifenbaum, Clemens Stupperich

  • 1University of Siegen, Center for Micro- and Nanochemistry, Adolf-Reichwein-Str. 2, 57068 Siegen, Germany.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|September 24, 2005
PubMed
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Researchers demonstrated enhanced fluorescence spectra and decay curves for single dye molecules using a novel Fabry-Perot microcavity. This cavity boosts the spontaneous emission rate via the Purcell effect, advancing room-temperature single-photon sources.

Area of Science:

  • Cavity Quantum Electrodynamics
  • Single-Molecule Spectroscopy
  • Photonics

Background:

  • Single dipole emitters are crucial for developing advanced optical technologies.
  • Controlling spontaneous emission is key to enhancing light-matter interactions.
  • Fabry-Perot microcavities offer a promising platform for modifying emission properties.

Purpose of the Study:

  • To investigate cavity-controlled fluorescence spectra and decay curves of single emitters.
  • To demonstrate the Purcell effect in a novel microcavity design.
  • To assess the stability and sensitivity of the microcavity for single-molecule applications.

Main Methods:

  • Utilized a Fabry-Perot microcavity with lambda/2-spaced silver mirrors.
  • Measured fluorescence spectra and decay curves of single dye molecules at room temperature.

Related Experiment Videos

  • Analyzed spontaneous emission rate enhancement due to cavity interaction.

    • Main Results:

    • Observed cavity-controlled fluorescence spectra and decay curves for individual emitters.
    • Demonstrated up to a three-fold enhancement in spontaneous emission rate via the Purcell effect.
    • Achieved long-term stability and single-molecule sensitivity under ambient conditions for several months.

    Conclusions:

    • The novel microcavity design effectively controls single-emitter fluorescence properties.
    • The Purcell effect significantly enhances spontaneous emission rates, validating theoretical predictions.
    • This work represents a significant advancement for stable, room-temperature single-photon sources.