Control of Light Diffusion in a Disordered Photonic Waveguide

TL;DR

This paper demonstrates how the diffusion of light in a disordered photonic waveguide can be controlled by geometrical modulation, aligning experimental results with localization theory without altering the disorder.

Contribution

It introduces a method to manipulate light diffusion in disordered waveguides through geometry control, avoiding changes to the structural disorder.

Findings

Diffusion coefficient varies spatially within the waveguide.

Intensity distribution matches localization theory predictions.

Wave diffusion can be controlled without changing disorder.

Abstract

We control the diffusion of light in a disordered photonic waveguide by modulating the waveguide geometry. In a single waveguide of varying cross-section, the diffusion coefficient changes spatially in two dimensions due to localization effects. The intensity distribution inside the waveguide agrees to the prediction of the self-consistent theory of localization. Our work shows that wave diffusion can be efficiently manipulated without modifying the structural disorder.