Control of mesoscopic transport by modifying transmission channels in opaque media

Abstract

Based on experiments and simulations, the authors use waveguides of nonuniform cross-sectional width to tailor the spatial distribution of the energy density of transmission channels and to realize conversion between evanescent and propagating channels. For particular geometries, perfect reflection channels are created, and their large penetration depth into the medium as well as the complete return of probe light to the input end should greatly benefit sensing and imaging applications.