We show the emergence of light localization in arrays of coupled optical waveguides with randomness only in the imaginary part of their refractive index and develop a one-parameter scaling theory for the normalized participation number of Floquet-Bloch modes. This localization introduces a different length scale in the decay of the autocorrelation function of a paraxial beam propagation. Our results are relevant to a vast family of systems with randomness in the dissipative part of their impedance spatial profile.
A. Basiri et al., "Light Localization Induced by a Random Imaginary Refractive Index," Physical Review A - Atomic, Molecular, and Optical Physics, vol. 90, no. 4, pp. 043815-1-043815-7, American Physical Society (APS), Oct 2014.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevA.90.043815
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