Circularly polarized thermal emission driven by chiral flatbands in monoclinic metasurfaces

IF 12.5 1区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES
Kaili Sun, Bingxiong Yang, Yangjian Cai, Yuri Kivshar, Zhanghua Han
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引用次数: 0

Abstract

Achieving circularly polarized thermal emissions with high spatiotemporal coherence using planar structures has long been considered to be elusive. Here, we use nonlocal metasurfaces with monoclinic lattices that break mirror symmetry to efficiently achieve circularly polarized thermal emissions with both high temporal and spatial coherence. We design a chiral metasurface based on waveguide arrays with periodically shifted segments that have a saddle-shaped chiral and high-Q dispersion band. The parabolic shape along one direction ensures minimum involvement of spatial/Fourier components at each frequency, thereby achieving circularly polarized thermal emission with high spatial coherence. Meanwhile, the flatband behavior along the other direction allows the use of a slot-shaped spatial filter and a mid-infrared lens to collect emissions from large-area metasurfaces, thus improving power collection efficiency without affecting temporal coherence. Our experiments demonstrate circularly polarized thermal emissions with high temporal coherence (Q > 200) and very large circular dichroism (~0.8).

Abstract Image

单斜超表面中手性平带驱动的圆极化热发射
利用平面结构实现具有高时空相干性的圆极化热发射一直被认为是难以实现的。在这里,我们使用具有单斜晶格的非局部超表面来打破镜像对称性,以有效地实现具有高时空相干性的圆极化热发射。我们设计了一种基于周期性移位的具有鞍形手性和高Q色散带的波导阵列的手性超表面。沿一个方向的抛物线形状确保了每个频率上空间/傅里叶分量的最小参与,从而实现了具有高空间相干性的圆极化热发射。同时,沿另一个方向的平坦带行为允许使用槽形空间滤波器和中红外透镜收集大面积超表面的发射,从而在不影响时间相干性的情况下提高功率收集效率。我们的实验证明了圆偏振热发射具有高时间相干性(Q >;200)和非常大的圆二色性(~0.8)。
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来源期刊
Science Advances
Science Advances 综合性期刊-综合性期刊
CiteScore
21.40
自引率
1.50%
发文量
1937
审稿时长
29 weeks
期刊介绍: Science Advances, an open-access journal by AAAS, publishes impactful research in diverse scientific areas. It aims for fair, fast, and expert peer review, providing freely accessible research to readers. Led by distinguished scientists, the journal supports AAAS's mission by extending Science magazine's capacity to identify and promote significant advances. Evolving digital publishing technologies play a crucial role in advancing AAAS's global mission for science communication and benefitting humankind.
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