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      Coherent enhancement of optical remission in diffusive media

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      Embargo Lift Date: 2023-10-03
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      Author(s)
      Bender, Nicholas
      Goetschy, Arthur
      Hsu, Chia Wei
      Yılmaz, Hasan
      Palacios, Pablo Jara
      Yamilov, Alexey
      Cao, Hui
      Date
      2022-10-03
      Source Title
      Proceedings of the National Academy of Sciences of the United States of America
      Electronic ISSN
      0027-8424
      Publisher
      National Academy of Sciences
      Volume
      119
      Issue
      41
      Pages
      1 - 6
      Language
      English
      Type
      Article
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      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. Copyright © 2022 the Author(s). Published by PNAS.
      Keywords
      Coherent control
      Remission
      Wave diffusion
      Wavefront shaping
      Permalink
      http://hdl.handle.net/11693/111826
      Published Version (Please cite this version)
      https://dx.doi.org/10.1073/pnas.2207089119
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      • Institute of Materials Science and Nanotechnology (UNAM) 2258
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