title: High-speed scattering medium characterization with application to focusing light through turbid media.
abstract: 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.
authors.affiliation: Department of Electrical, Computer, and Energy Engineering, University of Colorado, Boulder, Colorado 80309, USA. Donald.Conkey@Colorado.edu
authors.forename: Donald B
authors.initials: DB
authors.lastname: Conkey
authors.forename: Antonio M
authors.initials: AM
authors.lastname: Caravaca-Aguirre
authors.forename: Rafael
authors.initials: R
authors.lastname: Piestun
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation / Q000379:methods*; D004867:Equipment Design; D006696:Holography / Q000295:instrumentation / Q000379:methods*; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000295:instrumentation / Q000379:methods*; D007834:Lasers; D007909:Lenses; D009391:Nephelometry and Turbidimetry; D055095:Optics and Photonics / Q000295:instrumentation / Q000379:methods*; D012542:Scattering, Radiation