复杂介质中350 KHz波阵面整形的一维到二维变换
Wavefront shaping in complex media at 350 KHz with a 1D-to-2D transform
摘要：
在过去的几年里，控制光在复杂介质中的传播和相互作用引起了人们的极大兴趣。不幸的是，空间光调制设备受到速度有限的影响，这妨碍了诸如在活组织中成像的实时应用。为了解决这个关键问题，我们引入了一个相位控制技术来表征复杂的媒体的基础上使用快速的1D空间光调制器和1D到2D的转换进行分析的相同的介质。我们实现的概念，使用微机电光栅光阀（GLV）与1088自由度调制在350千赫，使前所未有的高速波前测量。我们连续测量传输矩阵，计算最佳波前，并通过各种动态散射样品实时投影焦点，所有这些都在每个周期2.4 ms内。这些结果将先前的波前整形调制速度提高了一个数量级以上，并为使用1D到2D变换的光学处理开辟了新的机会。
英文摘要：
Controlling the propagation and interaction of light in complex media has sparked major interest in the last few years. Unfortunately, spatial light modulation devices suffer from limited speed that precludes real-time applications such as imaging in live tissue. To address this critical problem we introduce a phase-control technique to characterize complex media based on the use of fast 1D spatial light modulators and a 1D-to-2D transformation performed by the same medium being analyzed. We implement the concept using a micro-electro-mechanical grating light valve (GLV) with 1088 degrees of freedom modulated at 350 KHz, enabling unprecedented high-speed wavefront measurements. We continuously measure the transmission matrix, calculate the optimal wavefront and project a focus through various dynamic scattering samples in real-time, all within 2.4 ms per cycle. These results improve prior wavefront shaping modulation speed by more than an order of magnitude and open new opportunities for optical processing using 1D-to-2D transformations.
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