Abstract.
We show analytically that for certain asymmetrically graded-index planar waveguides at the cutoff point where the effective refractive index of a mode coincides with the index of the substrate, there exist unusual bound modes. We have calculated the refractive-index profile that makes these modes possible.
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Received: 20 July 1996
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Nicola, S. Unusual bound modes in asymmetrically graded planar waveguides. Appl Phys B 64, 485–486 (1997). https://doi.org/10.1007/s003400050203
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DOI: https://doi.org/10.1007/s003400050203