White, Thomas; Sukhorukov, Andrey
We describe the generic effects of loss or gain on pulse propagation in photonic-crystal and plasmonic waveguides that support "frozen" or "in-band" slow light at dispersion inflection points in the absence of loss (or gain). Using an analytical perturbation theory, we find that propagating and evanescent modes hybridize when loss exceeds a certain threshold, resulting in a reduced attenuation rate and switching from slow to superluminal velocity. Numerical simulations for photonic-crystal...[Show more]
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