Deep and optically resolved imaging through scattering media by space-reversed propagation.

Area of Science:

• Biomedical Optics
• Microscopy Techniques
• Photonics

Background:

• Scattering and limited working distance impede deep tissue imaging in conventional microscopy.
• Preserving tissue viability requires low laser power, posing challenges for image quality.

Purpose of the Study:

• To develop a novel microscopy technique overcoming scattering and objective working distance limitations.
• To achieve high resolution and sensitivity at low laser power for deep tissue imaging.

Main Methods:

• Integration of laser optical feedback imaging with acoustic photon tagging.
• Application of synthetic aperture refocusing for image reconstruction.
• Demonstration of imaging beyond the microscope's working distance.

Main Results:

• Achieved ultimate shot-noise sensitivity at low laser power (10 mW).
• Obtained micrometer resolution over approximately eight transport mean free paths.
• Extended imaging capability to 1.3 times the microscope's working distance.

Conclusions:

• The novel microscopy technique effectively penetrates scattering media.
• This method enables high-resolution, deep-tissue imaging crucial for biomedical applications.
• Potential applications include advanced biomedical diagnosis and drug development.