Resonances and Resonant Fields in a Fabry-Perot Resonator Illuminated by a Line Source

Abstract

In the present paper, the field internal to an infinite-strip plane-parallel mirror resonator is evaluated in the case when the structure is illuminated by a cylindrical primary wave. The feeder where the primary wave originates constitutes a perturbation of the resonator and is assumed to scatter a cylindrical wave proportional to the field impinging on it. The quasi-stationary field pattern internal to the structure is evaluated for several values of the efficiency of the scatterer, that is, of the factor relating the wave scat- tered by the feeder to the wave impinging on the feeder. Resonant frequencies and fields are compared with the resonant frequencies and fields of a Fabry-Perot resonator not perturbed by the presence of the feeder. The effect of the persistent primary wave alone is analyzed by considering the case of a feeder with vanishing efficiency.