Abstract
We propose a scheme of quantum plasmon sensing system based on strong photon–exciton coupling in the gap surface plasmon nanostructure. The system’s sensitivity is characterized as Rabi splitting, which is sensitive to a slight change in environmental permittivity and determined by the coupling coefficient and detuning between the emitter and plasmon nanocavity. By increasing the dipole moment of the emitter, the sensitivity can exceed that of a traditional plasmon sensing system while only depending on the resonance spectral shift. Quantum plasmon sensing provides a unique mechanism in the application of bio-sensing, opto-chemical sensing, and quantum photonics at the nanoscale.
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