Journal
OPTICS EXPRESS
Volume 13, Issue 24, Pages 9922-9934Publisher
OPTICAL SOC AMER
DOI: 10.1364/OPEX.13.009922
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Starting from the condition that optical signals propagate causally, we derive Kramers-Kronig relations for waveguides. For hollow waveguides with perfectly conductive walls, the modes propagate causally and Kramers-Kronig relations between the real and imaginary part of the mode indices exist. For dielectric waveguides, there exists a Kramers-Kronig type relation between the real mode index of a guided mode and the imaginary mode indices associated with the evanescent modes. For weakly guiding waveguides, the Kramers-Kronig relations are particularly simple, as the modal dispersion is determined solely from the profile of the corresponding mode field. (c) 2005 Optical Society of America
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