Enhanced adaptive focusing through semi-transparent media.
Enhanced adaptive focusing through semi-transparent media.
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DOI：
10.1038/srep17406
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发表时间：
2015-12-01
影响因子：
4.6
通讯作者：
Leonetti M
中科院分区：
文献类型：
--
作者：
Di Battista D;Zacharakis G;Leonetti M
自适应光学可以通过补偿穿过散射幕时获得的随机相位延迟来聚焦穿过不透明介质的光。该技术通常在许多领域中使用，包括天体物理学，显微镜，生物医学和生物学。混浊透镜具有产生分辨率高于传统光学器件的焦点的能力，但是它有一个基本的限制：为了获得清晰的焦点，必须在光路中引入强散射介质。实际上，紧密聚焦需要强散射，因此，仅对于弱透射样品才能获得高分辨率聚焦。在这里，我们描述了一种新的方法，允许获得高度集中的光斑，甚至通过引入最小量的散射在光束路径与半透明材料。通过过滤透射光束的伪弹道分量，我们能够在实验上克服自适应聚焦分辨率的限制，将光聚集在直径为原始散斑相关函数的三分之一的光斑上。
Adaptive optics can focus light through opaque media by compensating the random phase delay acquired while crossing a scattering curtain. The technique is commonly exploited in many fields, including astrophysics, microscopy, biomedicine and biology. A turbid lens has the capability of producing foci with a resolution higher than conventional optics, however it has a fundamental limit: to obtain a sharp focus one has to introduce a strongly scattering medium in the optical path. Indeed a tight focusing needs strong scattering and, as a consequence, high resolution focusing is obtained only for weakly transmitting samples. Here we describe a novel method allowing to obtain highly concentrated optical spots even by introducing a minimum amount of scattering in the beam path with semi-transparent materials. By filtering the pseudo-ballistic components of the transmitted beam we are able to experimentally overcome the limits of the adaptive focus resolution, gathering light on a spot with a diameter which is one third of the original speckle correlation function.