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Plasmon-Induced Trap State Emission from Single Quantum Dots
Junyang Huang1, Oluwafemi S Ojambati1, Rohit Chikkaraddy1
1NanoPhotonics Centre, Cavendish Laboratory, Department of Physics, University of Cambridge, Cambridge CB3 0HE, United Kingdom.
Physical Review Letters
|February 12, 2021
Summary
Localized surface defects in quantum dots (QDs) are key to their photophysics. A nonradiative plasmon mode drives excitons to trap states, enhancing QD emission for optoelectronics and nanophotonics.
Area of Science:
- Materials Science
- Nanotechnology
- Quantum Physics
Background:
- Surface defects in quantum dots (QDs) significantly influence their photophysical properties.
- Surface trap states exhibit longer emission lifetimes compared to band-edge emission.
- QDs hold potential as nanoscale light-emitting excitons and qubits.
Purpose of the Study:
- To investigate the role of nonradiative plasmon modes in exciton transfer to trap states in QDs.
- To explore the manipulation of QD emission via plasmonic cavities.
- To understand fundamental interactions of excitonic spins and their impact on QD emission.
Main Methods:
- Utilizing plasmonic cavities to confine and enhance light-matter interactions.
- Investigating exciton dynamics and recombination pathways in QDs.
- Analyzing the influence of nonradiative plasmon modes on emission properties.
Main Results:
- Demonstrated that a nonradiative plasmon mode facilitates exciton transfer from two-photon-excited states to surface trap states.
- Observed dominance of trap emission and complete suppression of band-edge recombination within plasmonic cavities.
- Identified induced pathways for excitonic recombination.
Conclusions:
- Nonradiative plasmon modes are critical in controlling exciton dynamics and emission in QDs.
- Plasmonic cavities can effectively manipulate QD emission by favoring trap-state recombination.
- Findings offer new strategies for optoelectronics and nanophotonics applications by controlling QD emission.
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