Abstract
A monomode optical isolator depends upon the achievement of a substituted YIG waveguide. Computer simulations were used to study the propagation behaviour of polarised monochromatic light beams in guiding garnet structures. We used two approches : coupling analysis for TE and TM modes propagating in the upper layer of a planar YIG1/YIG2/GGG structure and a finite element analysis for two-dimensional structures, e.g. partially etched trapezoidal rib waveguides. We achieved single and double layer rib waveguides by ion beam milling and investigated the influence of the incident angle of the ion beam and the milling-rate in order to master the roughness of the edges.
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