the cavity. A full description of experimental observables should have the capacity to describe the way by which the incident field generates transmission and reflection signals as well as energy dissipation in the mirror environments. Second, theoretical considerations based on Eq. ( ) have been limited to considering the dynamics following polariton excitation in the single exciton subspace, where one photon absorbed from (and later emitted to) the far field forms a superposition of states in which only one molecule is excited or the cavity mode occupies its lowest excited level while higher order excitations of our system are disregarded. This approximation appears to be valid for weak incident fields, however its actual implications are presently unknown. Third, nuclear motion in the model ( ) is represented by a harmonic interaction and vibronic coupling is associaed with a shift in the equilibrium position that defines the harmonic nuclear potential. Consquently, the ensuing dynamics cannot describe a reactive processes such as molecular photodissociation.