Sub-acoustic resolution optical focusing through scattering using photoacoustic fluctuation guided wavefront shaping
Sub-acoustic resolution optical focusing through scattering using photoacoustic fluctuation guided wavefront shaping
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DOI：
10.1364/oe.385320
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发表时间：
2020-03-30
期刊：
影响因子：
3.8
通讯作者：
Murray, Todd W.
中科院分区：
文献类型：
--
作者：
Inzunza-Ibarra, Marco A.;Premillieu, Evolene;Murray, Todd W.
使用波前整形通过浑浊介质聚焦光通常需要非侵入性导星来提供聚焦过程的反馈。在此，我们报告了一种适合通过散射壁进行波前整形的光声导星机制，该机制基于填充有流动吸收体的微容器中产生的光声信号的波动。从颗粒的随机分布生成的光声信号的标准偏差取决于照明体积，并且随着照明体积的减小而非线性地增加。我们利用这种效应，使用光声响应的标准偏差作为反馈信号来引导波前整形。我们进一步通过遗传算法优化例程演示了通过扩散器的亚声分辨率光学聚焦。 (C) 2020 年美国光学学会根据 OSA 开放获取出版协议的条款
Focusing light through turbid media using wavefront shaping generally requires a noninvasive guide star to provide feedback on the focusing process. Herewe report a photoacoustic guide star mechanism suitable for wavefront shaping through a scattering wall that is based on the fluctuations in the photoacoustic signals generated in a micro-vessel filled with flowing absorbers. The standard deviation of photoacoustic signals generated from random distributions of particles is dependent on the illumination volume and increases nonlinearly as the illumination volume is decreased. We harness this effect to guide wavefront shaping using the standard deviation of the photoacoustic response as the feedback signal. We further demonstrate sub-acoustic resolution optical focusing through a diffuser with a genetic algorithm optimization routine. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement