Significance Waves propagate diffusively through disordered media—such as biological tissue, clouds, or Earth’s crust—due to random scattering. Although most waves are reflected, only a tiny fraction carry information from deep… Click to show full abstract
Significance Waves propagate diffusively through disordered media—such as biological tissue, clouds, or Earth’s crust—due to random scattering. Although most waves are reflected, only a tiny fraction carry information from deep inside the medium. These remitted waves are widely used to noninvasively probe disordered systems: from seismic interferometry to diffuse optical tomography and functional near-infrared spectroscopy. The meager signal-to-noise ratio of remitted waves eventually limits the depth that can be probed. By tailoring the spatial wavefront of a laser beam, the remitted signal can be enhanced by an order of magnitude, while increasing its sensitivity to local changes inside an optical diffusive medium. This work illustrates the potential of coherent wavefront control for noninvasive diffuse wave imaging applications.
Journal Title: Proceedings of the National Academy of Sciences of the United States of America
Year Published: 2022
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