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Shaping the wavefront of an incident wave to a complex scattering medium hasdemonstrated interesting possibilities, such as sub-diffraction wave focusingand enhancing light energy delivery. However, wavefront shaping has mainly beenbased on the control of transmitted waves that are inaccessible in mostrealistic applications. Here, we investigate the effect of maximizing thebackscattered waves at a specific flight time on wave propagation dynamics andenergy transport. We find both experimentally and numerically that themaximization at a short flight time focuses waves on the particles constitutingthe scattering medium, leading to the attenuation of the wave transport. On thecontrary, maximization at a long flight time induces constructive waveinterference inside the medium and thus enhances wave transport. We provide atheoretical model explaining this interesting transition behavior based on wavecorrelation. Our study provides a fundamental understanding of the effect ofwave control on internal wave dynamics.

Wave propagation dynamics inside a complex scattering medium by the temporal control of backscattered waves