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One of the daunting challenges in optical physics is to accurately controlthe flow of light at the subwavelength scale, by patterning the optical mediumone can design anisotropic media. The light transport can also be significantlyaffected by Anderson localization, namely the wave localization in a disorderedmedium, a ubiquitous phenomenon in wave physics. Here we report the photontransport and collimation enhanced by transverse Anderson localization inchip-scale dispersion engineered anisotropic media. We demonstrate a new typeof anisotropic photonic structure in which diffraction is nearly completelyarrested by cascaded resonant tunneling through transverse guided resonances.By perturbing the shape of more than 4,000 scatterers in these superlattices weadd structural disordered in a controlled manner and uncover the mechanism ofdisorder-induced transverse localization at the chip-scale. Arrested spatialdivergence is captured in the power-law scaling, along with exponentialasymmetric mode profiles and enhanced collimation bandwidth for increasingdisorder. With increasing disorder, we observe the crossover from cascadedguided resonances into the transverse localization regime, beyond the ballisticand diffusive transport of photons.

Photon transport enhanced by transverse Anderson localization in disordered superlattices