We address Anderson localization of light in disordered optical lattices where the disorder strength varies across the transverse direction. Such variation changes the preferred domains where formation of localized eigenmodes is most probable, hence drastically impacting light localization properties. Thus, step-like disorder results in formation of modes with different decay rates at both sides of the interface, while a smoothly varying disorder yields appearance of modes that are extended within weakly disordered domains and rapidly fade away in strongly disordered domains.
© 2012 Optical Society of America
Original Manuscript: September 28, 2011
Revised Manuscript: November 6, 2011
Manuscript Accepted: November 23, 2011
Published: January 19, 2012
Yaroslav V. Kartashov, Vladimir V. Konotop, Victor A. Vysloukh, and Lluis Torner, "Light localization in nonuniformly randomized lattices," Opt. Lett. 37, 286-288 (2012)