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Scattering of light in complex samples such as biological tissue renders most samples opaque to conventional optical imaging techniques, a problem of great practical importance [1]. However, although random, scattering of coherent light generates speckle patterns with universal statistics and angular and spatial correlations, that allow computational retrieval of diffraction-limited imaging [2,3]. Moreover, the random temporal fluctuations of speckle patterns can be exploited for super-resolution photo-acoustic and acousto-optic imaging, deep inside scattering samples [4-7].
I will present the fundamental principles and limitations of these novel approaches, as well as some of our recent efforts in undoing scattering by wavefront-shaping through image-metrics based optimization [8].
References
[1] Z. Merali, Optics: Super vision, Nature 518, 158 (2015).
[2] O. Katz et al. Non-invasive single-shot imaging through scattering layers and around corners via speckle correlations. Nature photonics, 8(10), 784-790 (2014).
[3] T. Yeminy, O. Katz, Guidestar-free image-guided wavefront shaping, Science Advances, 7, 21 (2021).
[4] T. Chaigne et al. Super-resolution photoacoustic fluctuation imaging with multiple speckle illumination, Optica 3 (1), 54-57 (2016).
[5] E. Hojman et al. Photoacoustic imaging beyond the acoustic diffraction-limit with dynamic speckle illumination and sparse joint support recovery, Optics Express 25 (5), 4875-4886 (2016).
[6] D. Doktofsky et al. Acousto optic imaging beyond the acoustic diffraction limit using speckle decorrelation, Communications Physics 3 (1), 1-8 (2020).
[7] M. Rosenfeld, D. Doktofsky, G. Weinberg, Y. Li, L. Tian, O. Katz, Acousto-optic Ptychography, Optica 2021 (in press)
[8] T.Yeminy, O.Katz, Guide-star free image-guided wavefront shaping, Science Advances, 7 : eabf5364 (2021)
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