It is informative to examine the local field enhancement (relative to the incident field amplitude) inside the cavity as a function of field carrier frequency and the longitudinal coordinate z. Fig. compares the ensemble average of the local field enhancement with the linear transmission presenting them as functions of the driving frequency. The local field is enhanced at the polaritonic frequencies and the lower and upper polariton frequencies seen in the enhancement spectrum are nearly identical to those seen in the transmission signal. Additionally, the ratio of the upper to the lower polariton contributions to the local field and transmission are noticeably different: 1.53 for the field enhancement and 1.92 for the transmission. This indicates that the cavity mode dispersion plays less of a critical role for the local field that drives molecules. Furthermore, the spatial dependence of the field enhancement vs carrier frequency is shown in Figs. and. The cavity mode is localized in the center of the cavity peaking at 1.69 eV. When the molecular slab is present and the cavity is tuned to the transition frequency, two polaritonic states are observed. Both exhibit spatial localization similar to the fundamental mode in Fig. .