Modal contours for biaxial thin-film waveguides.
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.
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Hodgkinson
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Kassam
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Hazel
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S
Cloughley
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QH
Wu