Focusing of light energy inside a scattering medium by controlling the time-gated multiple light scattering
Abstract
The efficient delivery of light energy is a prerequisite for the non-invasive imaging and stimulating of target objects embedded deep within a scattering medium. However, the injected waves experience random diffusion by multiple light scattering, and only a small fraction reaches the target object. Here, we present a method to counteract wave diffusion and to focus multiple-scattered waves at the deeply embedded target. To realize this, we experimentally inject light into the reflection eigenchannels of a specific flight time to preferably enhance the intensity of those multiple-scattered waves that have interacted with the target object. For targets that are too deep to be visible by optical imaging, we demonstrate a more than tenfold enhancement in light energy delivery in comparison with ordinary wave diffusion cases. This work will lay a foundation to enhance the working depth of imaging, sensing and light stimulation.
- Publication:
-
Nature Photonics
- Pub Date:
- March 2018
- DOI:
- 10.1038/s41566-018-0120-9
- arXiv:
- arXiv:1709.09337
- Bibcode:
- 2018NaPho..12..277J
- Keywords:
-
- Physics - Optics;
- Physics - Biological Physics
- E-Print:
- doi:10.1038/s41566-018-0120-9