  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.
