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.
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This research was supported by IBS-R023-D1 and the Global Frontier Program (2014M3A6B3063710) through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning. It was also supported by the Korea Health Technology R&D Project (HI14C0748) funded by the Ministry of Health & Welfare, Republic of Korea. H.-G.P. acknowledges support from an NRF grant funded by the Korean government (MSIT) (no. 2009-0081565).
The authors declare no competing interests.
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Numerical and theoretical analyses, additional experimental data analysis, comparison of experimental data with the theoretical results, and further discussion on the proposed method.
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Jeong, S., Lee, YR., Choi, W. et al. Focusing of light energy inside a scattering medium by controlling the time-gated multiple light scattering. Nature Photon 12, 277–283 (2018). https://doi.org/10.1038/s41566-018-0120-9
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