We propose a migration technique for the deposition of the top dielectric mirror in the fabrication of planar microcavities containing a fragile molecular active layer. Our goal is to preserve the active material during this deposition step. The technique is validated by the fabrication of a passive cavity, showing a quality factor similar to that achieved by a conventional monolithic approach. The migration technique is then used to fabricate a perovskite-based organic-inorganic microcavity

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... emission in the strong coupling regime. Polariton emission lines are well resolved at room temperature, and efficient polariton relaxation toward the lowest energy polariton states is achieved using the migration method.