Light Focusing and Two-Dimensional Imaging Through Scattering Media   using the Photoacoustic Transmission-Matrix with an Ultrasound Array
  We implement the photoacoustic transmission-matrix approach on a two-dimensional photoacoustic imaging system, using a 15 MHz linear ultrasound array. Using a black leaf skeleton as a complex absorbing structure, we demonstrate that the photoacoustic transmission-matrix approach allows to reveal structural features that are invisible in conventional photoacoustic images, as well as to selectively control light focusing on absorbing targets, leading to a local enhancement of the photoacoustic signal. 
Thomas Chaigne, Jerome Gateau, Ori Katz, Emmanuel Bossy and Sylvain   Gigan
physics.optics