通过控制时间选通多重光散射在散射介质内聚焦光能
Focusing of light energy inside a scattering medium by controlling the time-gated multiple light scattering
摘要：
光能的有效传递是对深埋在散射介质内的目标对象进行非侵入式成像和刺激的先决条件。然而，注入的波通过多次光散射经历随机扩散，并且只有一小部分到达目标物体。在这里，我们提出了一种方法，以抵消波扩散和重点multiplescattered波深埋目标。为了实现这一点，我们实验性地将光注入到特定飞行时间的反射本征通道，其中大多数多重散射波与目标物体相互作用，并在选定的时间最大化返回的多重散射波的强度。对于太深而无法通过光学成像看到的目标，我们证明了与普通波扩散情况相比，光能传递的增强超过10倍。这项工作将为提高成像、传感和光刺激的工作深度奠定基础。
英文摘要：
The efficient delivery of light energy is a prerequisite for non-invasive imaging and stimulating of target objects embedded deep within a scattering medium. However, injected waves experience random diffusion by multiple light scattering, and only a small fraction reaches the target object. Here we present a method to counteract wave diffusion and to focus multiplescattered waves to the deeply embedded target. To realize this, we experimentally inject light to the reflection eigenchannels of a specific flight time where most of the multiple-scattered waves have interacted with the target object and maximize the intensity of the returning multiple-scattered waves at the selected time. For targets that are too deep to be visible by optical imaging, we demonstrated a more than 10-fold enhancement in light energy delivery in comparison with ordinary wave diffusion cases. This work will lay a foundation for enhancing the working depth of imaging, sensing, and light stimulation.
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