Abstract

Disorder causes the Bloch waves to localize in otherwise periodic lattices resulting in Transverse Anderson Localization [l]. However, certain localization regime exists where the logarithm of the transverse width is proportional to logarithm of the propagation distance, known as Anomalous Localization. Such phenomenon occurs owing to enhancement in non-uniformity in disordered system. In this regime due to random scattering, the photons mimic Lévy flight like random walk. Such distributions are identified by the heavy-tailed nature of the intensity fluctuation. This light dynamics can be observed in evanescently coupled waveguide arrays forming a lattice where scattering length can be tuned. These systems are fabricated out of a bulk material by etching out waveguides by using the technique of ULI (Ultrafast Laser Inscribtion) or lithography [2].

© 2019 Japan Society of Applied Physics, The Optical Society (OSA)