High-speed scattering medium characterization with application to focusing light through turbid media

Opt Express. 2012 Jan 16;20(2):1733-40. doi: 10.1364/OE.20.001733.


We introduce a phase-control holographic technique to characterize scattering media with the purpose of focusing light through it. The system generates computer-generated holograms implemented via a deformable mirror device (DMD) based on micro-electro-mechanical technology. The DMD can be updated at high data rates, enabling high speed wavefront measurements using the transmission matrix method. The transmission matrix of a scattering material determines the hologram required for focusing through the scatterer. We demonstrate this technique measuring a transmission matrix with 256 input modes and a single output mode in 33.8 ms and creating a focus with a signal to background ratio of 160. We also demonstrate focusing through a temporally dynamic, strongly scattering sample with short speckle decorrelation times.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Biosensing Techniques / instrumentation
  • Biosensing Techniques / methods*
  • Equipment Design
  • Holography / instrumentation
  • Holography / methods*
  • Humans
  • Image Processing, Computer-Assisted / instrumentation
  • Image Processing, Computer-Assisted / methods*
  • Lasers
  • Lenses
  • Nephelometry and Turbidimetry
  • Optics and Photonics / instrumentation
  • Optics and Photonics / methods*
  • Scattering, Radiation