Coherent enhancement of optical remission in diffusive media
Abstract
From the earth's crust to the human brain, remitted waves are used for sensing and imaging in a diverse range of diffusive media. Separating the source and detector increases the penetration depth of remitted light, yet rapidly decreases the signal strength, leading to a poor signal-to-noise ratio. Here, we experimentally and numerically show that wavefront shaping a laser beam incident on a diffusive sample enables an order of magnitude remission enhancement, with a penetration depth 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 non-invasive diffuse-wave imaging applications, such as diffuse optical tomography and functional near-infrared spectroscopy.
Keywords
Cite
@article{arxiv.2205.00351,
title = {Coherent enhancement of optical remission in diffusive media},
author = {Nicholas Bender and Arthur Goetschy and Chia Wei Hsu and Hasan Yilmaz and Pablo Jara Palacios and Alexey Yamilov and Hui Cao},
journal= {arXiv preprint arXiv:2205.00351},
year = {2022}
}