Aulbach Jochen, Bretagne Alice, Fink Mathias, Tanter Mickaël, Tourin Arnaud
Institut Langevin, ESPCI ParisTech, CNRS, 10 rue Vauquelin, 75231 Paris Cedex 05, France.
Phys Rev E Stat Nonlin Soft Matter Phys. 2012 Jan;85(1 Pt 2):016605. doi: 10.1103/PhysRevE.85.016605. Epub 2012 Jan 30.
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.
我们提出了一种通过波前整形在复杂散射介质中进行时空聚焦的替代方法。利用非线性反馈信号对入射脉冲波前进行整形，我们证明了可以实现时空匹配滤波器的极限；即，对于给定的输入能量，在预期的时间和聚焦位置处的波幅最大化。这与时间反转所实现的效果完全相同。通过超声实验证明，我们的方法普遍适用于所有类型的波。
