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We study both theoretically and experimentally the effects of introducingdeliberate disorder in a slow-light photonic crystal waveguide on the photondensity of states. We first introduce a theoretical model that includes bothdeliberate disorder through statistically moving the hole centres in thephotonic crystal lattice and intrinsic disorder caused by manufacturingimperfections. We demonstrate a disorder-induced mean blueshift and an overallbroadening of the photonic density of states for various amounts of deliberatedisorder. By comparing with measurements from a GaAs photonic crystalwaveguide, we find good qualitative agreement between theory and experimentwhich highlights the importance of carefully including local field effects formodelling high-index contrast perturbations. Our work also demonstrates theimportance of using asymmetric dielectric polarizabilities for modellingpositive and negative dielectric perturbations when modelling a perturbeddielectric interface in photonic crystal platforms.

Theory and experiments of disorder-induced resonance shifts and mode edge broadening in deliberately disordered photonic crystal waveguides