Sub-acoustic resolution optical focusing through scattering using photoacoustic fluctuation guided wavefront shaping

被引：13
|
作者：
Inzunza-Ibarra, Marco A. [1 ]
Premillieu, Evolene [2 ]
Gruensteidl, Clemens [1 ,3 ]
Piestun, Rafael [2 ]
Murray, Todd W. [1 ]
机构：
[1] Univ Colorado, Dept Mech Engn, Boulder, CO 80309 USA
[2] Univ Colorado, Dept Elect Comp & Energy Engn, Boulder, CO 80309 USA
[3] Res Ctr Non Destruct Testing GmbH, A-4040 Linz, Austria
来源：
OPTICS EXPRESS | 2020年 / 28卷 / 07期
基金：
美国国家科学基金会;
关键词：
SPECKLE-FREE NATURE; PHASE-CONJUGATION; LIGHT; MEDIA; TIME; MICROSCOPY; VISIBILITY; REGIME;
D O I：
10.1364/OE.385320
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
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
引用
收藏
页码：9823 / 9832
页数：10
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