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arXiv 1808.07830physics.opticsphysics.bio-ph
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通过散射介质聚焦:散斑大小和强度增强之间的基本权衡

Focusing through scattering medium: a fundamental trade-off between speckle size and intensity enhancement

Eitan Edrei, Giuliano Scarcelli

摘要:

在过去的十年中,通过修改照明光束的相位分布来使光聚焦通过高散射材料已经吸引了大量的关注,为新的应用铺平了道路。在这里,我们发现了一个权衡两个看似独立的量的关键重要性在聚焦过程中:焦点的大小后获得的散射介质和最大可实现的亮度这样的焦点。我们从理论上推导和实验证明的强度增强的焦点的基本限制,并将它们与散射现象的固有特性。我们证明,当聚焦平面更接近散射层时,强度增强限制变得占主导地位,从而限制了在高对比度下获得紧密聚焦的能力,这与探索散射材料作为高分辨率聚焦和成像平台的许多应用直接相关

英文摘要:

Focusing light through highly 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 discovered 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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