Abstract
Hybrid exciton states can be formed under the strong coupling of plasmons excited by metal nanostructures and excitons. Because of the large exciton binding energy, black phosphorus (BP) is an ideal platform to investigate the strong coupling. In this paper, we first demonstrate the strong coupling between local surface plasmon modes of different metal nanostructures and excitons in monolayer BP by adjusting the dimensions of nanostructures and polarization angle at room temperature. Moreover, the exciton dispersion curves obtained from the coupled oscillator model show the anti-crossing behavior at the exciton energy. And the Rabi splitting energies of the two different BP-metal nanostructures heterostructure are 250 meV and 202 meV, respectively, which paves a way towards the development of BP photodetectors, sensors, and emitters.
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