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Waves propagate diffusively through disordered media due to random scattering. Though most waves are reflected, only a tiny fraction carries information from deep inside the medium. These remitted waves are widely used for noninvasive probing from seismic interferometry to diffuse optical tomography and functional near-infrared spectroscopy. The meager signal-to-noise ratio of remitted waves eventually limits the probing depth. By tailoring spatial wavefront of a laser beam, we enhance remitted signal by an order of magnitude, and increase its sensitivity to local changes inside an opaque medium. This work illustrates the potential of coherent wavefront control for noninvasive diffuse-wave imaging applications.
Hui Cao
"Enhancing light remission to probe deep inside diffusive media", Proc. SPIE PC12447, Quantum Sensing, Imaging, and Precision Metrology, PC124471Q (9 March 2023); https://doi.org/10.1117/12.2657393
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Hui Cao, "Enhancing light remission to probe deep inside diffusive media," Proc. SPIE PC12447, Quantum Sensing, Imaging, and Precision Metrology, PC124471Q (9 March 2023); https://doi.org/10.1117/12.2657393