光通过散射介质聚焦的空间位相逐个单元调节方法

A Spatial Phase Modulation Method of Rapid Convergence for Focusing Coherent Light Through Scattering Media

本研究在分析现有散射介质聚焦方法的基础上,提出一种利用单元裂解进行波前位相调制,将经过强散射介质的散射光聚焦的快速收敛方法.文中详细地描述了这一新方法的原理,并同现有逐个单元调节方法进行运行对比.单元裂解方法的物理本质,即为实现空间光调制器的调制各单元光波之间同位相干涉.本方法具有更高的信噪比,并且聚焦收敛的速度快.这一新方法为进一步开展生物成像的光学理论研究提供了新思路.

method of focusing strongly scattered light through turbid media based on spatial light wavefront modulation was proposed in the field of biophysical imaging. The content and procedure of this new method was detailed described. The strict optical theory indicates that the focusing result is better if the effect of interference is considered more intensely. The experiment also indicates this phenomenon. In addition, the experiment reveals that under the same conditions, the more the number of pixels controlled on spatial light modulator, the better the focusing result is. This new method has higher signal-to-noise ratio than other methods. The result of focusing and the phase board uploaded on spatial light modulator are displayed in the paper. At the same time, the convergence rate of focusing is much faster than other methods. That is mainly because our method has considered interference and the focusing result is the superposition of all pixels modulated on spatial light modulator. Therefore, we think that it will provide a new idea for the research of biophysics imaging.