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Updated: Jan 28, 2026

Compact Quantum Dots for Single-molecule Imaging
Published on: October 9, 2012
Quantum electrodynamics at room temperature coupling a single vibrating molecule with a plasmonic nanocavity
Oluwafemi S Ojambati1, Rohit Chikkaraddy1, William D Deacon1
1NanoPhotonics Centre, Cavendish Laboratory, Department of Physics, JJ Thompson Avenue, University of Cambridge, Cambridge, CB3 0HE, UK.
Single molecules in plasmonic nanocavities exhibit strong quantum electrodynamics effects at room temperature. This demonstrates potential for new molecular device applications using cavity quantum electrodynamics.
Area of Science:
- Quantum Optics
- Molecular Photonics
- Nanophotonics
Background:
- Cavity quantum electrodynamics (cQED) traditionally studies light-matter interactions in fundamental quantum systems.
- Achieving strong coupling in molecular systems at ambient conditions remains a significant challenge.
Purpose of the Study:
- To investigate coherent interactions between a single molecule and a sub-wavelength plasmonic nanocavity.
- To explore cavity quantum electrodynamics effects in molecular systems at room temperature.
Main Methods:
- Utilized DNA origami to align a single Atto647 molecule within a plasmonic nanocavity.
- Employed power-dependent pulsed excitation to observe Rabi oscillations.
- Analyzed single-molecule fluorescence emission and second-order correlation functions.
Main Results:
- Demonstrated coherent interaction between the single molecule and the nanocavity, approaching the cooperative regime.
- Observed Rabi oscillations and anti-crossing of emission modes, confirming strong coupling.
- Photon emission statistics showed pump wavelength dependence, influenced by vibrational relaxation.
Conclusions:
- Cavity quantum electrodynamics effects are achievable in molecular systems under ambient conditions.
- The study highlights the potential for developing novel molecular devices leveraging strong light-matter interactions.
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