The efficient delivery of light energy is a prerequisite for the non-invasive imaging and stimulating of target objects embedded deep within a scattering medium. However, the 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 multiple-scattered waves at the deeply embedded target. To realize this, we experimentally inject light into the reflection eigenchannels of a specific flight time to preferably enhance the intensity of those multiple-scattered waves that have interacted with the target object. For targets that are too deep to be visible by optical imaging, we demonstrate a more than tenfold enhancement in light energy delivery in comparison with ordinary wave diffusion cases. This work will lay a foundation to enhance the working depth of imaging, sensing and light stimulation.

光能的有效传递是无创成像和刺激深埋在散射介质中的目标物体的先决条件。然而，注入的波由于多次光散射而经历随机扩散，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来抵消波的扩散并将多重散射波聚焦在深埋目标上。为了实现这一点，我们通过实验将光注入特定飞行时间的反射本征通道中，以更好地增强与目标物体相互作用的那些多重散射波的强度。对于太深而无法通过光学成像观察到的目标，我们证明与普通的波扩散情况相比，光能传递增强了十倍以上。