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- W1964749887 abstract "The dispersive properties of waves are strongly affected by inevitable residual disorder in man-made propagating media, in particular in the slow wave regime. By a direct measurement of the dispersion curve in $k$ space, we show that the nature of the guided modes in real photonic crystal waveguides undergoes an abrupt transition in the vicinity of a band edge. Such a transition that is not highlighted by standard optical transmission measurement, defines the limit where $k$ can be considered as a good quantum number. In the framework of a mean-field theory we propose a qualitative description of this effect and attribute it to the transition from the ``dispersive'' regime to the diffusive regime. In particular we prove that a scaling law exists between the strength of the disorder and the group velocity. As a result, for group velocities ${v}_{g}$ smaller than $c/25$ the diffusive contribution to the light transport is predominant. In this regime the group velocity ${v}_{g}$ loses its relevance and the energy transport velocity ${v}_{E}$ is the proper light speed to consider." @default.
- W1964749887 created "2016-06-24" @default.
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- W1964749887 date "2009-09-28" @default.
- W1964749887 modified "2023-10-10" @default.
- W1964749887 title "Light transport regimes in slow light photonic crystal waveguides" @default.
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- W1964749887 doi "https://doi.org/10.1103/physrevb.80.125332" @default.
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