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- Title
Fine-tuning biexcitons-plasmon coherent states in a single nanocavity.
- Authors
Liang, Kun; Jin, Lei; Deng, Xuyan; Jiang, Ping; Yu, Li
- Abstract
A tunable plexcitonic material that sustains multimode hybridization is highly desirable, which is vital for advanced quantum devices. However, the research about regulations of biexcitons-plasmon coherent states has rarely been reported. Here we apply single-nanoparticle scattering spectroscopy correlative with SEM imaging to identify biexcitons-plasmon interaction in a metal-semiconductor hybrid structure composed of a single Au@Ag nanoparticle, J-aggregates molecules and tungsten disulfide (WS2) monolayer. The mode competition within the localized plasmonic hotspots (∼240 nm3) is revealed by continuously regulating the J-aggregates spacer. Two distinct anticrossings are observed at both excitons resonances, and large double Rabi splittings (137 meV and 124 meV) are obtained successfully. We establish experimentally that J-aggregates and WS2 monolayer are responsible for the middle polariton states, while plasmon rarely contributes. Further calculations show that plasmonic nanocavity enables coherent energy exchange with different excitons by providing a highly enhanced localized E-field. In addition, we find that the multimode coupling strengths can be efficiently tuned by changing the cavity morphology and environment temperature, where the tuning spectral accuracy can reach up to 1 nm. Our findings uncover the distinctive properties of biexcitons-plasmon polaritons, suggest an easily obtainable multiqubit states platform, and open up a new way to construct nanoscale photonic devices.
- Subjects
COHERENT states; NANOELECTROMECHANICAL systems; SCANNING electron microscopy; NANOPARTICLES; EXCITON theory; CESIUM isotopes; RABI oscillations
- Publication
Nanophotonics (21928606), 2023, Vol 12, Issue 17, p3471
- ISSN
2192-8606
- Publication type
Article
- DOI
10.1515/nanoph-2023-0304