Theoretical analysis on guided-wave magnetooptic mode conversion and diffraction under tilted bias magnetic field

Magnetostatic waves-based guided-wave magneto-optics is concerned with magn eto-optic (MO) interactions between guided-optical waves and magnetostatic waves (MSW), and the resulting devices in a magnetic material substrate suc h as YIG-GGG. Specifically, non-collinear MO Bragg interactions between the guided-optical waves and the MSWs in the YIG-GGG waveguides under perpendi cular bias magnetic field have resulted in guided wave MO Bragg cell modula tors in analogy with guided-wave acousto-optic counterpart. In this work a coupled-mode treatment on the magneto-optic mode-conversion and Bragg diffr action under tilted bias magnetic field is presented. it is shown that in g eneral the mode-conversion efficiency and the Bragg -diffraction efficiency are not identical except when the tilt angle approaches zero.