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Deep-strong tunable plasmon-exciton coupling utilizing Ag-Si core-shell combined with WS2 monolayer for quantum
Mohamed Mahmoud1, A T AlMotasem1,2, M I Abd-Elrahman1
1Department of Physics, Faculty of Science, Assiut University, Assiut 71516, Egypt.
The Journal of Chemical Physics
|September 2, 2025
Summary
This study shows that silver-silicon core-shell nanoparticles with tungsten disulfide quantum emitters achieve deep-strong plasmon-exciton coupling, outperforming silicon-only systems for advanced nanophotonic devices.
Area of Science:
- Nanophotonics
- Quantum Optics
- Materials Science
Background:
- Plasmon-exciton coupling between plasmonic nanoparticles (NPs) and quantum emitters (QEs) is vital for nanophotonic devices.
- Strong coupling, characterized by Rabi splitting, is essential for applications like solar cells and nanolasers.
- High refractive index semiconductor NPs, such as silicon (Si) NPs, show promise but face limitations due to large mode volumes.
Purpose of the Study:
- To investigate plasmon-exciton coupling in a hybrid Ag-Si core-shell NP and WS2 QE system (Ag-Si-WS2).
- To compare the coupling dynamics of the Ag-Si-WS2 system with a Si-WS2 system in air and water.
- To determine the conditions for achieving strong coupling and analyze spectral characteristics.
Main Methods:
- Utilized Mie's theory for core-shell scattering and Maxwell-Garnett effective medium theory.
- Analyzed the optical responses of Ag-Si-WS2 and Si-WS2 configurations.
- Calculated Rabi splitting frequencies to identify coupling regimes.
Main Results:
- The Ag-Si-WS2 system achieved deep-strong coupling for Ag core radii < 30 nm, with enhanced coupling in water.
- The Si-WS2 system did not reach strong coupling in either medium.
- Ag-Si-WS2 exhibited symmetrical spectral characteristics, unlike the asymmetric Si-WS2 system.
Conclusions:
- The Ag-Si-WS2 system demonstrates superior plasmon-exciton coupling compared to Si-WS2.
- This hybrid system offers potential for enhancing optoelectronic and quantum electronic devices.
- Environmental conditions (air vs. water) significantly influence coupling strength.
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