Effect of a weak longitudinal modulation in refractive index on transverse localization of light in 1D disordered waveguide lattices

TL;DR

This paper demonstrates that a weak longitudinal modulation of refractive index enhances transverse localization of light in disordered waveguide lattices, enabling diffraction-free propagation and tunable localization thresholds.

Contribution

It introduces a novel approach of using weak longitudinal modulation to improve light localization in disordered waveguide lattices.

Findings

Longitudinal modulation enhances transverse localization.

Diffraction-free propagation achieved with disorder.

Tunable threshold for light localization.

Abstract

We report the enhancement of the effect of transverse localization of light (TL) in presence of a weak longitudinal modulation of refractive index in disordered waveguide lattices. In our chosen lattices, tunneling inhibition along length favors to achieve the diffraction-free propagation along with the simultaneous presence of transverse disorder. Results will be useful to tune the threshold value of disorder to achieve localized light.