Superresolution imaging by computational time reversal in scattering media

Contrary to intuition, a slab of scattering medium can be used for accurate, high-resolution imaging of impulsive electromagnetic point sources using time reversal. The imaging process reconstructs the location and the magnitude of the sources from their field response transmitted through the scattering medium and recorded at a single point. This response is reversed in time and injected back into the computational domain at the probe location. The back-in-time field solution pinpoints the original source locations and yields the source amplitude coefficients through correlation of the transmitted signal with the multi-path environment provided by the scattering medium.