Tagging of photon trajectories in scattering media is possible by application of a localized ultrasonic field to the sample and by measurement of the induced speckle modulation. Instead of using a single optical detector, which integrates the signal of many speckle grains, we propose a more efficient detection scheme that uses a CCD camera and parallel lock-in detection to record the full modulation of the speckle. The advantage of this multiplex detection is demonstrated, as well as the imaging capabilities of the process for biological tissues.
© 1999 Optical Society of America
(000.1430) General : Biology and medicine
(030.6140) Coherence and statistical optics : Speckle
(040.1520) Detectors : CCD, charge-coupled device
(100.0100) Image processing : Image processing
S. Lévêque, A. C. Boccara, M. Lebec*, and H. Saint-Jalmes*, "Ultrasonic tagging of photon paths in scattering media: parallel speckle modulation processing," Opt. Lett. 24, 181-183 (1999)