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4 March 2019 Focusing through scattering medium: a fundamental trade-off between speckle size and intensity enhancement (Conference Presentation)
Eitan Edrei, Giuliano Scarcelli
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Proceedings Volume 10886, Adaptive Optics and Wavefront Control for Biological Systems V; 108860O (2019) https://doi.org/10.1117/12.2508360
Event: SPIE BiOS, 2019, San Francisco, California, United States
Abstract
Focusing light through scattering materials by modifying the phase profile of the illuminating beam has attracted a great deal of attention in the past decade paving the way towards novel applications. Here we introduce a tradeoff between two seemingly independent quantities of critical importance in the focusing process: the size of the focal point obtained behind a scattering medium and the maximum achievable brightness of such focal point. We theoretically derive and experimentally demonstrate the fundamental limits of intensity enhancement of the focal point and relate them to the intrinsic properties of the scattering phenomenon. We demonstrate that the intensity enhancement limitation becomes dominant when the focusing plane gets closer to the scattering layer thus limiting the ability to obtain tight focusing at high contrast, which has direct relevance for the many applications exploring scattering materials as a platform for high resolution focusing and imaging
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Eitan Edrei and Giuliano Scarcelli "Focusing through scattering medium: a fundamental trade-off between speckle size and intensity enhancement (Conference Presentation)", Proc. SPIE 10886, Adaptive Optics and Wavefront Control for Biological Systems V, 108860O (4 March 2019); https://doi.org/10.1117/12.2508360
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KEYWORDS
Scattering
Laser scattering
Light scattering
Speckle
Image resolution
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