Sun Kaili, Wang Guangdong, Li Wenyu, Wang Yinghan, Cai Yangjian, Huang Lujun, Alù Andrea, Han Zhanghua
Shandong Provincial Key Laboratory of Optics and Photonic Devices, Center of Light Manipulation and Applications, School of Physics and Electronics, Shandong Normal University, Jinan, China.
State Key Laboratory of Precision Spectroscopy, School of Physics and Electronic Science, Engineering Research Center of Nanophotonics & Advanced Instrument, Ministry of Education, East China Normal University, Shanghai, China.
Nat Commun. 2025 Sep 25;16(1):8393. doi: 10.1038/s41467-025-63334-0.
Photonic engineering in metasurfaces has enabled unprecedented control over thermal emissions in recent years. Here, we present a design strategy that achieves full and simultaneous control over both polarization and coherence of thermal emission across a broad range of output angles. Our design builds upon a double-sided corrugated waveguide array that supports a unique saddle-shaped high-Q dispersion band-parabolic along the waveguide direction to ensure high spatial coherence by involving minimal wavevectors, and flat in the perpendicular direction to enhance collection efficiency through 1D spatial filters and focusing lenses. The continuous tuning of polarization states is achieved by adjusting the relative offset of corrugations along the waveguide direction. We fabricate a series of metasurfaces and demonstrate record-high temporal coherence (Q ≈ 304), spatial coherence (coherence length: 0.32 mm), spin coherence (emission circular dichroism ≈ 0.91), and multiple polarization states, with all features retained over large output angles (over 10°).
近年来，超表面中的光子工程实现了对热辐射前所未有的控制。在此，我们提出一种设计策略，可在很宽的输出角度范围内对热辐射的偏振和相干性实现全面且同时的控制。我们的设计基于双面波纹波导阵列，该阵列支持一个独特的鞍形高Q色散带，沿波导方向呈抛物线形，通过涉及最小波矢来确保高空间相干性，而在垂直方向上是平坦的，以通过一维空间滤波器和聚焦透镜提高收集效率。通过调整沿波导方向的波纹相对偏移来实现偏振态的连续调谐。我们制作了一系列超表面，并展示出创纪录的高时间相干性（Q≈304）、空间相干性（相干长度：0.32毫米）、自旋相干性（发射圆二色性≈0.91）以及多种偏振态，所有这些特性在大输出角度（超过10°）范围内均得以保持。
