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引用次数: 0
摘要
我们提出了一种能独立调节线性圆极化波的太赫兹元表面。它由顶层 "O-O "型金属图案、聚酰亚胺层、中间层 "I "型金属图案、聚酰亚胺层和金属基板自上而下组成。利用 Pancharatnam Berry(PB)的相位原理进行编码和排列,元表面在圆极化太赫兹波入射下产生具有不同拓扑电荷的涡流束,并在不同位置实现聚焦偏移。结合卷积定理进行编码排列,元表面可在圆极化太赫兹波入射下实现聚焦涡旋功能。所设计的元表面还能在线性极化太赫兹波入射下产生艾里波束。仿真结果表明,在不同极化(线极化/圆极化)太赫兹波入射下,元表面可以实现不同的功能,这为灵活控制太赫兹波提供了一种新方法。
Independently regulating linearly and circularly polarized terahertz wave metasurface
We propose a terahertz metasurface that can independently regulate linearly circularly polarized waves. It consists of the top layer “O-O” metal pattern, polyimide layer, middle layer “I” shaped metal pattern, polyimide layer, and metal substrate from top to bottom. By using the phase principle of Pancharatnam Berry (PB) for encoding and arrangement, the metasurface generates vortex beams with different topological charges under circularly polarized terahertz wave incidence, and achieves focusing shift at different positions. Combining the convolution theorem for encoding arrangement, the metasurface can achieve focused vortex function under circularly polarized terahertz wave incidence. The designed metasurface can also generate Airy beam under linearly polarized terahertz wave incidence. The simulation results indicate that under different polarization (linear/circular polarization) terahertz wave incidence, the metasurface can achieve different functions, which provides a new approach for flexible control of terahertz waves.
期刊介绍:
The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community.
Optical Materials Express (OMEx), OSA''s open-access, rapid-review journal, primarily emphasizes advances in both conventional and novel optical materials, their properties, theory and modeling, synthesis and fabrication approaches for optics and photonics; how such materials contribute to novel optical behavior; and how they enable new or improved optical devices. The journal covers a full range of topics, including, but not limited to:
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Optical Materials Express considers original research articles, feature issue contributions, invited reviews, and comments on published articles. The Journal also publishes occasional short, timely opinion articles from experts and thought-leaders in the field on current or emerging topic areas that are generating significant interest.