Focusing light into scattering media with ultrasound-induced field perturbation.
Focusing light into scattering media with ultrasound-induced field perturbation.
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DOI：
10.1038/s41377-021-00605-7
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发表时间：
2021-08-02
期刊：
影响因子：
--
通讯作者：
Wang LV
中科院分区：
文献类型：
--
作者：
Cheng Z;Wang LV
将光聚焦到散射介质中，虽然具有挑战性，但在许多领域中是非常期望的。随着时间反转超声编码（TRUE）光学聚焦的发明，声光调制被证明是一种有前途的导星机制，用于实现非侵入性和可寻址的光学聚焦到散射介质中。在这里，我们报告了一种新的超声辅助技术，超声诱导场扰动光学聚焦，简称为UFP。与传统的TRUE光学聚焦不同，在传统的TRUE光学聚焦中，由于声光调制，只有微弱的频移一阶衍射光子是有用的，这里的UFP利用由超声导星衍射的更亮的零阶光子作为信息载体来引导光学聚焦。我们发现，零级衍射光子虽然没有频移，但由于超声导星的存在，会产生场的扰动。通过检测和时间反转的频率不变的光子的差分场时，超声是交替打开和关闭，我们可以聚焦光的位置，场扰动发生在散射介质内。我们在这里证明，超微粒子光学聚焦具有上级性能，传统的真正的光学聚焦，这得益于更强烈的零阶光子。我们进一步表明，UFP光学聚焦可以很容易和灵活地发展成双镜头实现，甚至单镜头实现，这是高速波前整形所希望的。这一新方法打破了传统的思维效用的超声guidstar和拓宽视野的光控制在散射介质。我们希望它提供了一个更有效和灵活的机制，实现超声引导波前整形。一个波前整形技术与超声诱导的光场扰动，这提供了一个有效的和灵活的机制，实现非侵入性和可寻址的光学聚焦到散射介质。
Focusing light into scattering media, although challenging, is highly desirable in many realms. With the invention of time-reversed ultrasonically encoded (TRUE) optical focusing, acousto-optic modulation was demonstrated as a promising guidestar mechanism for achieving noninvasive and addressable optical focusing into scattering media. Here, we report a new ultrasound-assisted technique, ultrasound-induced field perturbation optical focusing, abbreviated as UFP. Unlike in conventional TRUE optical focusing, where only the weak frequency-shifted first-order diffracted photons due to acousto-optic modulation are useful, here UFP leverages the brighter zeroth-order photons diffracted by an ultrasonic guidestar as information carriers to guide optical focusing. We find that the zeroth-order diffracted photons, although not frequency-shifted, do have a field perturbation caused by the existence of the ultrasonic guidestar. By detecting and time-reversing the differential field of the frequency-unshifted photons when the ultrasound is alternately ON and OFF, we can focus light to the position where the field perturbation occurs inside the scattering medium. We demonstrate here that UFP optical focusing has superior performance to conventional TRUE optical focusing, which benefits from the more intense zeroth-order photons. We further show that UFP optical focusing can be easily and flexibly developed into double-shot realization or even single-shot realization, which is desirable for high-speed wavefront shaping. This new method upsets conventional thinking on the utility of an ultrasonic guidestar and broadens the horizon of light control in scattering media. We hope that it provides a more efficient and flexible mechanism for implementing ultrasound-guided wavefront shaping. A wavefront shaping technique with ultrasound-induced optical field perturbation is demonstrated, which provides an efficient and flexible mechanism to implement noninvasive and addressable optical focusing into scattering media.
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