Tunable strong coupling between excitons and magnetic Mie mode in 2D perovskite/silicon core/shell nanostructure

Low optical loss and high refractive index semiconductor materials are ideal for light-matter interactions at the nanoscale. In this work, we propose a two-dimensional perovskite core and silicon shell structure to study strong coupling between the perovskite exciton and magnetic Mie mode of the silicon shell. Simulations based on the Lorentz dielectric function of perovskite reveal that Mie resonance peaks can be tuned to maintain the dominant magnetic dipole Mie modes, enabling strong coupling with Rabi splitting of about 100 meV. When the experimental dielectric function of 2D perovskite is performed, the Rabi splitting increases to 115 meV. Further tuning of the 2D perovskite core size, silicon shell thickness, and refractive index indicates that the hybrid modes remain in the strong coupling regime. This work provides a strategy for tunable light-matter interactions in nanophotonic devices.