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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Quantum-Coherence-Enhanced Hot-Electron Injection under Modal Strong Coupling.
Yen-En Liu1, Xu Shi2, Tomohiro Yokoyama3
1Research Institute for Electronic Science, Hokkaido University, Sapporo, Hokkaido 001-0021, Japan.
ACS Nano
|April 21, 2023
Summary
Quantum coherence in plasmonic nanostructures boosts artificial photosynthesis efficiency by enhancing hot-electron injection. This study observed and quantified quantum coherence, paving the way for improved photochemical reactions.
Area of Science:
- Plasmonics
- Quantum Optics
- Materials Science
- Photocatalysis
Background:
- Artificial photosynthesis aims to improve quantum efficiency.
- Localized surface plasmon resonance (LSPR) and Fabry-Pérot nanocavities are key optical structures.
- Understanding hot-electron injection mechanisms is crucial for efficiency enhancement.
Purpose of the Study:
- Investigate the mechanism of quantum efficiency enhancement in artificial photosynthesis.
- Explore modal strong coupling between LSPR and nanocavities.
- Determine the role of quantum coherence in hot-electron injection.
Main Methods:
- Fabrication of Au nanodisk/titanium dioxide/Au film modal strong coupling structures.
- Utilizing photoemission electron microscopy for near-field mapping.
- Quantitative evaluation of coherence area via splitting energy and particle density analysis.
- Theoretical modeling to support experimental findings.
Main Results:
- Observed direct evidence of quantum coherence using photoemission electron microscopy.
- Demonstrated that quantum coherence enhances apparent quantum efficiency of hot-electron injection.
- Quantitatively evaluated the coherence area in the nanostructures.
- Validated the quantum-coherence-enhanced hot-electron injection mechanism with a theoretical model.
Conclusions:
- Quantum coherence plays a significant role in enhancing the quantum efficiency of artificial photosynthesis.
- Modal strong coupling structures effectively facilitate quantum-coherence-enhanced hot-electron injection.
- Applying quantum coherence principles can lead to significant improvements in photochemical reaction efficiencies.
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