We present an alternative approach for spatiotemporal focusing through complex scattering media by wave front shaping. Using a nonlinear feedback signal to shape the incident pulsed wave front, we show that the limit of a spatiotemporal matched filter can be achieved; i.e., the wave amplitude at the intended time and focus position is maximized for a given input energy. It is exactly what is also achieved with time reversal. Demonstrated with ultrasound experiments, our method is generally applicable to all types of waves.

Additional Metadata
Publisher APS
Persistent URL dx.doi.org/10.1103/PhysRevE.85.016605
Journal Phys. Rev. E
Aulbach, J, Bretagne, A, Fink, M, Tanter, M, & Tourin, A. (2012). Optimal spatiotemporal focusing through complex scattering media. Phys. Rev. E, 85(Article number: 16605), 1–7. doi:10.1103/PhysRevE.85.016605