Abstract

The modal characteristics of a general tilted columnar biaxial thin-film waveguide are displayed by the plots of both Snell’s law quantity β = n sin θ and the polarization of the evanescent field at the cover interface on a polar diagram. The association of characteristic features in the modal diagram with the basis fields is demonstrated, and the mechanism that allows p and s modes propagating in the deposition plane to overlap, without the modal contours crossing, is explored.

© 1996 Optical Society of America

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