Hybrid systems based on porous silicon microcavities and quantum emitters (QEs) are of much interest in terms of both basic research and development of new hybrid photoluminescent (PL) materials to be used in photonic, optoelectronic, and sensing applications. In these systems, light-matter coupling is established, whose strength could be increased to achieve the strong coupling regime by enhancing the quality factor of the microcavity. Incorporation of plasmonic nanoparticles (PNPs) also promotes an increase in the coupling strength and establishment of the coupling regime via the formation of hierarchical plasmon-optical cavities. Here we present the results of a numerical study of hybrid systems comprising porous silicon microcavities and plasmonic arrays placed inside them. These hybrid systems enable hierarchical plasmon-optical coupling with exciton transitions in QEs embedded into a porous silicon microcavity. We used numerical simulations to estimate the critical parameters for achieving light-matter coupling, including the Purcell factor and expected field enhancement, as well as the spatial distribution of the electromagnetic field within the structure. We speculate that light-matter coupling between the PL of QEs and the hierarchical cavity mode is stronger than in a microcavity not containing PNPs.
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