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The role of a prominent photonic bandgap (PBG) on the phenomenon oftransverse localization of light in a semi-infinite lossless waveguide latticeconsisting of evanescently coupled disordered one-dimensional opticalwaveguides has been investigated numerically. The interplay between theunderlying photonic bandgap due to inherent periodicity of the optical systemand various levels of deliberately induced transverse disorder in itsrefractive index periodicity has been studied. We show that the PBG indeedplays an important role and its simultaneous presence could catalyzerealization of localized light even when strength of disorder is notsufficiently strong to independently cause localization of light. An importantoutcome of this study revealed that PBG could be gainfully exploited to tailorthe spectral window for localization of light in potential applications likelasing in a disordered optical lattice.

Transverse localization of light in 1D disordered waveguide lattices with backbone photonic bandgap