Full-Space Janus Meta-Lens for Shared-Aperture Transmission-Reflection-Independent Focusing of Electromagnetic Wave

IF 3.7 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Advanced Photonics Research Pub Date : 2024-02-10 DOI:10.1002/adpr.202300349

Shufang Dong, Kai Qu, Qi Hu, Shaojie Wang, Ke Chen, Yijun Feng

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Abstract

Janus metasurfaces emerge as a promising platform for implementing multiple wave functionalities by fully exploiting the inherent propagation direction of electromagnetic waves. Their out-of-plane asymmetric structures enable different wave functions depending on the propagation direction. Herein, a multiplexed Janus metasurface is proposed, which operates in the microwave region to flexibly manipulate the transmission and reflection wavefronts for same linearly polarized (LP) incidence propagating along the two opposite directions. A meta-lens is constructed to validate the concept of full-space shared-aperture transmission-reflection-independent focusing of electromagnetic (EM) waves, exhibiting four distinct focusing performances. Experiments are conducted in the microwave region that agree well with the simulation results. The proposed full-space Janus metasurface may provide a platform for asymmetric imaging, multichannel information processing, and encrypted communication.

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用于共享孔径透射-反射独立聚焦电磁波的全空间简纳斯元透镜

杰纳斯元表面是一种很有前途的平台，它能充分利用电磁波固有的传播方向来实现多种波功能。其平面外不对称结构可根据传播方向实现不同的波功能。在此，我们提出了一种复用 Janus 元表面，它可在微波区域灵活操纵沿两个相反方向传播的相同线性偏振（LP）入射的传输和反射波面。我们构建了一个元透镜来验证全空间共享孔径透射-反射独立聚焦电磁波（EM）的概念，并展示了四种不同的聚焦性能。在微波区域进行的实验与模拟结果完全吻合。所提出的全空间 Janus 元表面可为非对称成像、多通道信息处理和加密通信提供一个平台。

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Advanced Photonics Research

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2.70%

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