  Can we couple multiple molecular species to soft-cavities? The answer to this
question has relevance in designing open cavities for polaritonic chemistry
applications. Due to the differences in adhesiveness it is difficult to couple
multiple molecular species to open cavities in a controlled and precise manner.
In this letter, we discuss the procedure to coat multiple dyes, TDBC and S2275,
using a layer-by-layer deposition technique onto a dielectric microsphere so as
to facilitate the multi molecule coupling. We observed the formation of a
middle polariton branch due to the inter-molecular mixing facilitated by the
whispering gallery modes. The coupling strength,2g, of the TDBC molecules were
found to be 98 meV while that of S2275 molecules was 78 meV. The coupling
strength was found to be greater than the cavity linewidth and the molecular
absorption linewidth showing the system is in the strong coupling regime.
