Starting from the condition that optical signals propagate causally, we have obtained Kramers-Kronig relations for waveguides. Evanescent modes contribute as an effective loss term in these relations when material absorption is negligible.
© 2006 Optical Society of America
M. W. Haakestad and J. Skaar, "Causality and Kramers-Kronig Relations for Waveguides," in Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference and Photonic Applications Systems Technologies, Technical Digest (CD) (Optical Society of America, 2006), paper JWB57.
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