Liu Leixin, Liu Wenwei, Wang Fei, Cheng Hua, Choi Duk-Yong, Tian Jianguo, Cai Yangjian, Chen Shuqi
Shandong Provincial Engineering and Technical Center of Light Manipulation & Shandong Provincial Key Laboratory of Optics and Photonic Device, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China.
The Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, Renewable Energy Conversion and Storage Center, School of Physics and TEDA Institute of Applied Physics, Nankai University, Tianjin 300071, China.
Nano Lett. 2022 Aug 10;22(15):6342-6349. doi: 10.1021/acs.nanolett.2c02115. Epub 2022 Jul 25.
Coherence, similar to amplitude, polarization, and phase, is a fundamental characteristic of the light fields and is dominated by the statistical optical property. Although spatial coherence is one of the pivotal optical dimensions, it has not been significantly manipulated on the photonic platform. Here, we theoretically and experimentally manipulate the spatial coherence of light fields by loading different random phase distributions onto the wavefront with a metasurface. We achieve the generation of partially coherent light with a predefined degree of coherence and continuously modulate it from coherent to incoherent by controlling the phase fluctuation ranges or the beam sizes. This design strategy can be easily extended to manipulate arbitrary phase-only special beams with the same degree of coherence. Our approach provides straightforward rules to manipulate the coherence of light fields in an extra-cavity-based manner and paves the way for further applications in ghost imaging and information transmission in turbulent media.
与振幅、偏振和相位类似，相干性是光场的一个基本特性，并且由统计光学性质主导。尽管空间相干性是关键的光学维度之一，但在光子平台上尚未对其进行显著操控。在此，我们通过用超表面在波前加载不同的随机相位分布，从理论和实验上操控光场的空间相干性。我们实现了具有预定义相干度的部分相干光的产生，并通过控制相位涨落范围或光束尺寸将其从相干连续调制为非相干。这种设计策略可以很容易地扩展到操控具有相同相干度的任意纯相位特殊光束。我们的方法提供了以基于腔外方式操控光场相干性的直接规则，并为在湍流介质中的鬼成像和信息传输等进一步应用铺平了道路。
