Long-range spatio-temporal correlations in multimode fibers for pulse delivery
Long-range spatio-temporal correlations in multimode fibers for pulse delivery
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DOI：
10.1038/s41467-019-10916-4
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发表时间：
2019-07-05
影响因子：
16.6
通讯作者：
Cao, Hui
中科院分区：
文献类型：
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作者：
Xiong, Wen;Hsu, Chia Wei;Cao, Hui
长程关联在无序介质中的波输运中起着至关重要的作用，但在其他复杂系统中却很少被研究。在这里，我们发现了时空强度相关的光脉冲通过多模光纤传输与强随机模式耦合。正的长程相关来自于光纤模式空间中的多次散射，并且依赖于到达时间的统计分布。通过优化脉冲的入射波前，我们最大化在选定的时间传输的功率，这种控制显着增强了远程时空相关。我们提供了一个明确的相关性和功率增强之间的关系，这与实验结果相一致。我们的工作表明，多模光纤提供了一个肥沃的土壤，研究复杂的波动现象。强的空间-时间相关性可以用于在明确定义的时间处的有效功率输送。
Long-range correlations play an essential role in wave transport through disordered media, but have rarely been studied in other complex systems. Here we discover spatio-temporal intensity correlations for an optical pulse propagating through a multimode fiber with strong random mode coupling. Positive long-range correlation arises from multiple scattering in fiber mode space and depends on the statistical distribution of arrival times. By optimizing the incident wavefront of a pulse, we maximize the power transmitted at a selected time, and such control is significantly enhanced by the long-range spatio-temporal correlation. We provide an explicit relation between the correlation and the power enhancement, which agrees with experimental results. Our work shows that multimode fibers provide a fertile ground for studying complex wave phenomena. The strong spatio-temporal correlation can be employed for efficient power delivery at a well-defined time.