7 February 2008 Disorder-induced high-Q cavities in photonic crystal waveguides
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We demonstrate experimentally that random departure from high-index-contrast periodicity in photonic crystal waveguides gives rise to spectral features that bear signatures of Anderson localization. Disorder-induced high-Q cavities are observed in a narrow frequency band close to the guided mode's cut-off where the light propagates with slow group velocity. Spectrally distinct quasi-states with Qs as high as ~250,000 are distributed at random locations along the waveguide and can find applications for example in optical sensing systems.
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Frank Vollmer, Frank Vollmer, Juraj Topolancik, Juraj Topolancik, } "Disorder-induced high-Q cavities in photonic crystal waveguides", Proc. SPIE 6872, Laser Resonators and Beam Control X, 68720X (7 February 2008); doi: 10.1117/12.773405; https://doi.org/10.1117/12.773405

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