Hao Xiang, Martin-Rouault Laure, Cui Meng
1] HHMI Janelia Research Campus, 19700 Helix Drive, Ashburn, VA 20147, USA [2] State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou, 310027, China.
HHMI Janelia Research Campus, 19700 Helix Drive, Ashburn, VA 20147, USA.
Sci Rep. 2014 Jul 29;4:5874. doi: 10.1038/srep05874.
Controlling the propagation of electromagnetic waves is important to a broad range of applications. Recent advances in controlling wave propagation in random scattering media have enabled optical focusing and imaging inside random scattering media. In this work, we propose and demonstrate a new method to deliver optical power more efficiently through scattering media. Drastically different from the random matrix characterization approach, our method can rapidly establish high efficiency communication channels using just a few measurements, regardless of the number of optical modes, and provides a practical and robust solution to boost the signal levels in optical or short wave communications. We experimentally demonstrated analog and digital signal transmission through highly scattering media with greatly improved performance. Besides scattering, our method can also reduce the loss of signal due to absorption. Experimentally, we observed that our method forced light to go around absorbers, leading to even higher signal improvement than in the case of purely scattering media. Interestingly, the resulting signal improvement is highly directional, which provides a new means against eavesdropping.
控制电磁波的传播对广泛的应用来说至关重要。随机散射介质中波传播控制方面的最新进展已实现了随机散射介质内部的光学聚焦和成像。在这项工作中，我们提出并演示了一种通过散射介质更高效地传输光功率的新方法。与随机矩阵表征方法截然不同，我们的方法仅通过几次测量就能快速建立高效通信通道，而无需考虑光学模式的数量，并为提高光通信或短波通信中的信号电平提供了一种实用且稳健的解决方案。我们通过实验证明了通过高散射介质进行模拟和数字信号传输时性能有了极大提升。除了散射，我们的方法还能减少由于吸收导致的信号损失。在实验中，我们观察到我们的方法迫使光绕过吸收体，相比于纯散射介质的情况，信号提升甚至更高。有趣的是，由此产生的信号提升具有高度方向性，这为防止窃听提供了一种新手段。
