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Abstract
A planar thin isotropic film sandwiched between an isotropic cover and an electro-optic crystal (substrate) which is uniaxially anisotropic can support transverse electric and transverse magnetic guided modes. When an external electric field is applied to the substrate and is harmonically modulated in the propagation direction to provide the necessary phase matching, the two modes coherently interact and exchange energy in the propagation direction. The governing equations of this interaction are rigorously deduced from the wave theory using a perturbation technique and are analyzed to yield the requirement for the complete polarization conversion.