Focusing through scattering media is a subject of great interest due to its direct impact in the field of biomedical optics. However, the greatest barrier currently limiting direct applications is the fact that most scattering media that we wish to deliver light through are dynamic. To focus or deliver light through dynamic scattering media, using a digital micromirror device (DMD) has been demonstrated to be a potential solution, as it enables fast modulation speeds. However, since a DMD is a binary amplitude modulator, the large number of controlled modes needed to acquire adequate focus enhancement has limited optimal usage. Here we demonstrate a novel (to the best of our knowledge) scheme to use the “thrown-away” components of light to effectively use a binary amplitude DMD as a binary phase modulator, thereby increasing the correction efficiency by a factor of two. Our concept can be applied to any iterative optimization algorithm and can speed up the iterative optimization process by increasing the enhancement factor, rather than the measurement or modulation speeds.

中文翻译：

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增加基于DMD的波前成形的增强因子。

由于其在生物医学光学领域的直接影响，通过散射介质聚焦是一个非常令人感兴趣的话题。但是，当前限制直接应用的最大障碍是，我们希望通过其传播光的大多数散射介质都是动态的。为了通过动态散射介质聚焦或传递光，使用数字微镜设备（DMD）已被证明是一种潜在的解决方案，因为它可以实现快速的调制速度。但是，由于DMD是二进制幅度调制器，因此获得足够的聚焦增强所需的大量受控模式限制了最佳用法。在这里，我们展示了一种新颖的方案（据我们所知），该方案使用光的“抛弃型”分量有效地将二进制幅度DMD用作二进制相位调制器，从而将校正效率提高了两倍。我们的概念可以应用于任何迭代优化算法，并且可以通过增加增强因子而不是测量或调制速度来加快迭代优化过程。