Principle of “Enhance the delivery of light energy ultra-deep into turbid medium by controlling multiple scattering photons to travel in open channels” (IMAGE)
Caption
Step.1. Construction of the reflection matrix, which describes the photons propagation process within the sample. Step.2. A mathematical decomposition, known as time reversal operator, is applied to the reflection matrix to separate three types of photons (ξSS, ξMS1, and ξMS2) from each other. Step.3. By matching the wavefront to the sample, ξMS1 will travel through the sample in the “open channels”. The propagation of photons in these channels will experience a high transmission coefficient directly to the desired focusing point. The other ξMS2 photons will travel in the eigenchannels with a transmission coefficient close to zero. Step.4. The energy matrix derived from the reversal results that act as a camera inside the sample to “visualize" the practical energy distribution and the degree of focus.
Credit
by Jing Cao, Qiang Yang, Yusi Miao, Yan Li, Saijun Qiu, Zhikai Zhu, Pinghe Wang, Zhongping Chen
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License
CC BY