Time-reversed adapted-perturbation (TRAP) optical focusing onto dynamic objects inside scattering media

Area of Science:

• Optics and Photonics
• Biomedical Imaging
• Non-linear Optics

Background:

• Focusing light within scattering media is crucial for various applications but currently relies on inconvenient guide star methods.
• Existing techniques using implanted or virtual guide stars have limitations in practicality and scope.

Purpose of the Study:

• To introduce a novel scheme for focusing light inside scattering media by utilizing intrinsic dynamics as guide stars.
• To overcome the limitations of current methods for optical focusing in scattering environments.

Main Methods:

• Employing intrinsic dynamics within the scattering medium as adaptive guide stars.
• Utilizing time-reversal of the scattered light's perturbed component.
• Demonstrating dynamic light focusing onto moving targets.

Main Results:

• Successfully focused light to the origin of a perturbation within scattering media.
• Achieved non-invasive dynamic light focusing on moving targets.
• Enabled imaging of time-variant objects obscured by highly scattering media.

Conclusions:

• The proposed method offers a new paradigm for light manipulation in scattering media.
• This technique has potential applications in biomedical imaging, such as tumor vessel analysis and photoablation.
• The approach allows for dynamic focusing and imaging through complex scattering environments.