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Updated: Sep 21, 2025
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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
Published on: July 21, 2018
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Plasmonic Cavities and Individual Quantum Emitters in the Strong Coupling Limit
1Chemical Research Support, Weizmann Institute of Science, P.O. Box 26, Rehovot 7610001, Israel.
Accounts of Chemical Research
|June 1, 2022
Summary
Strong coupling between quantum dots and plasmonic cavities generates new hybrid states, enabling the study of light-matter interactions. This research explores vacuum Rabi splitting in single quantum dots within bowtie cavities, revealing complex dynamics involving dark states.
Area of Science:
- Optics and Photonics
- Quantum Optics
- Materials Science
Background:
- Plasmonic cavities (PCs) are crucial for controlling light-matter interactions, with prior research focusing on the weak coupling regime and the Purcell effect.
- A growing interest exists in the strong-coupling (SC) regime, where emitters and PCs hybridize to form polaritons, characterized by vacuum Rabi splitting (VRS).
Purpose of the Study:
- To investigate strong coupling (SC) between quantum dots (QDs) and plasmonic silver bowtie cavities.
- To explore the phenomenon of vacuum Rabi splitting (VRS) at the single-emitter limit.
- To understand the role of dark plasmonic modes and multiple excited states in QD-PC systems.
Main Methods:
- Utilized optical dark-field microspectroscopy to observe VRS in individual QDs coupled to bowtie cavities.
- Employed electron energy loss spectroscopy (EELS) to measure SC in both bright and subradiant plasmonic modes.
- Applied Hanbury Brown and Twiss interferometry to confirm the quantum nature of photoluminescence (PL) from QDs in PCs.
- Conducted model simulations using an extended Jaynes-Cummings Hamiltonian.
Main Results:
- Observed VRS in individual QDs within plasmonic bowtie cavities, demonstrating strong light-matter interaction.
- Successfully measured SC in dark plasmonic modes, which have longer lifetimes for energy storage.
- Discrepancies between scattering and PL spectra indicated the involvement of multiple excited states, including dark states.
- Simulations confirmed that dark QD states significantly influence the observed spectral features and dynamics.
Conclusions:
- Strong coupling between QDs and plasmonic cavities, particularly bowtie structures, facilitates the generation of polaritons and VRS.
- The involvement of dark states in QDs leads to complex relaxation pathways and unique spectral characteristics.
- Future research aims to deepen SC for applications like single-photon sources and cavity-induced coherent interactions.
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