title: Optimal spatiotemporal focusing through complex scattering media.
abstract: 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.
authors.affiliation: Institut Langevin, ESPCI ParisTech, CNRS, 10 rue Vauquelin, 75231 Paris Cedex 05, France. j.aulbach@amolf.nl
authors.forename: Jochen
authors.initials: J
authors.lastname: Aulbach
authors.forename: Alice
authors.initials: A
authors.lastname: Bretagne
authors.forename: Mathias
authors.initials: M
authors.lastname: Fink
authors.forename: Mickaël
authors.initials: M
authors.lastname: Tanter
authors.forename: Arnaud
authors.initials: A
authors.lastname: Tourin