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

Area of Science:

• Optics and Photonics
• Wavefront Engineering
• Light Scattering

Background:

• Characterizing scattering media is crucial for applications like biological imaging and optical communication.
• Traditional methods for focusing light through scattering media can be slow and complex.
• Dynamic scattering media pose a significant challenge due to rapid changes in light propagation.

Purpose of the Study:

• To introduce a novel phase-control holographic technique for rapid characterization of scattering media.
• To enable high-speed wavefront shaping for focusing light through complex optical environments.
• To demonstrate focusing through temporally dynamic scattering samples.

Main Methods:

• Utilizing a deformable mirror device (DMD) to generate computer-generated holograms.
• Implementing the transmission matrix method for high-speed wavefront measurements.
• Measuring a transmission matrix with 256 input modes and a single output mode in 33.8 ms.

Main Results:

• Achieved focusing through scattering media with a high signal-to-background ratio of 160.
• Demonstrated the capability of the technique for dynamic scattering samples with short speckle decorrelation times.
• Successfully measured transmission matrices at high data rates enabled by the DMD.

Conclusions:

• The developed phase-control holographic technique offers a fast and effective solution for focusing light through scattering media.
• This method is suitable for applications involving dynamic scattering environments.
• The high-speed wavefront measurement capability opens new avenues for real-time optical control in complex media.