Optical properties of dual-state Fabry-Perot talons

We consider the optical properties of dual-state Fabry-Perot étalons where both the cavity and the external media can support two eigenmodes with different refractive indices. A matrix formulation is developed to analyze resonant transmission of such étalons. The results are presented and discussed. In particular, the results can be employed to explain the resonances of phase-locked arrays of antiguides.