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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

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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.

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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.