Coherent enhancement of optical remission in diffusive media
Abstract
Remitted waves are used for sensing and imaging in diverse diffusive media from the Earth’s crust to the human brain. Separating the source and detector increases the penetration depth of light, but the signal strength decreases rapidly, leading to a poor signal-to-noise ratio. Here, we show, experimentally and numerically, that wavefront shaping a laser beam incident on a diffusive sample enables an enhancement of remission by an order of magnitude at depths of up to 10 transport mean free paths. We develop a theoretical model which predicts the maximal remission enhancement. Our analysis reveals a significant improvement in the sensitivity of remitted waves to local changes of absorption deep inside diffusive media. This work illustrates the potential of coherent wavefront control for noninvasive diffuse wave imaging applications, such as diffuse optical tomography and functional near-infrared spectroscopy.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Oct 03, 2022
- Source ID
- 10.1073/pnas.2207089119
Entities
People
- Alexey Yamilov
- Arthur Goetschy
- Chia Wei Hsu
- Hasan Yılmaz
- Hui Cao
- Nicholas Bender
- Pablo Jara Palacios
Organizations
- Agence Nationale de la Recherche
- Bilkent University
- ESPCI Paris, PSL University
- National Science Foundation
- Office of Naval Research Global
- University of Southern California
- Yale University