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Room-Temperature Optical Picocavities below 1 nm3 Accessing Single-Atom Geometries
Cloudy Carnegie1, Jack Griffiths1, Bart de Nijs1
1NanoPhotonics Centre, Cavendish Laboratory, Department of Physics , University of Cambridge , JJ Thomson Avenue , Cambridge CB3 0HE , United Kingdom.
Researchers created stable picocavities for subnanometer light confinement, enabling single-molecule chemistry at room temperature. This breakthrough allows detailed nanoscale structural analysis and control of chemical reactions.
Area of Science:
- Nanophotonics
- Surface Chemistry
- Single-Molecule Spectroscopy
Background:
- Reproducible nanoscale light confinement is crucial for observing and controlling single-molecule chemical reactions.
- Existing methods lack the resolution and stability for ambient condition studies.
Purpose of the Study:
- To develop and characterize stable picocavities for subnanometer light confinement.
- To demonstrate the feasibility of single-molecule chemistry under ambient conditions.
Main Methods:
- Fabrication of millions of identical nanocavities and picocavities (single-adatom protrusions).
- High-speed surface-enhanced Raman spectroscopy (SErS) at room temperature.
- Analysis of over 2 million spectra from selected molecular components.
Main Results:
- Achieved subnanometer light focusing using picocavities with angstrom-level resolution.
- Thiol binding to gold destabilizes the metal surface under optical irradiation.
- Nitrile moieties stabilize picocavities, increasing their survival time to over 1 second.
Conclusions:
- Picocavities offer unprecedented control over light at the nanoscale.
- Demonstrated the potential for studying single-molecule chemistry under ambient conditions.
- Identified molecular strategies for enhancing picocavity stability.
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