We present light transmission measurements and frequency-delay reflectometrymaps for GaAs photonic crystal membranes, which show the transition frompropagation with a well defined group velocity to a regime completely dominatedby disorder-induced coherent scattering. Employing a self-consistent opticalscattering theory, with only statistical functions to describe the structuraldisorder, we obtain an excellent agreement with the experiments using nofitting parameters. Our experiments and theory together provide clear physicalinsight into naturally occurring light localization and multiplecoherent-scattering phenomena in slow-light waveguides.
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