Arbitrary manipulations of dual harmonics and their wave behaviors based on space-time-coding digital metasurface

J. Dai, Jin Yang, Wan-Chun Tang, Ming Zheng Chen, J. Ke, Q. Cheng, Shi Jin, T. Cui
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引用次数: 30

Abstract

Space-time modulated metasurfaces have attracted significant attention due to the additional degree of freedom in manipulating the electromagnetic (EM) waves in both space and time domains. However, the existing techniques have limited wave control capabilities, leading to just a few feasible schemes like regulation of only one specific harmonic. Here, we propose to realize independent manipulations of arbitrarily dual harmonics and their wave behaviors using a space-time-coding (STC) digital metasurface. By employing different STC sequences to the reflection phase of the metasurface, independent phase-pattern configurations of two desired harmonics can be achieved simultaneously, which further leads to independent beam shaping at the two harmonic frequencies. An analytical theory is developed to offer the physical insights in the arbitrary dual-harmonic manipulations of spectra and spatial beams, which is verified by experiments with good agreements. The presented STC strategy provides a new way to design multifunctional programmable systems, which will find potential applications such as cognitive radar and multi-user wireless communications.
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基于空时编码数字超表面的对偶谐波任意操纵及其波动行为
时空调制的超表面由于其在空间和时间域中对电磁波的操纵具有额外的自由度而引起了人们的广泛关注。然而,现有技术的波浪控制能力有限,导致只有少数可行的方案,如只调节一个特定的谐波。在这里,我们提出使用一个时空编码(STC)数字超表面来实现任意对偶谐波及其波动行为的独立操纵。通过对超表面的反射相位采用不同的STC序列,可以同时实现两个期望谐波的独立相图配置,从而进一步实现两个谐波频率下的独立波束整形。本文提出了一种解析理论,为光谱和空间光束的任意双谐波操作提供了物理见解,并通过实验验证了这一理论的正确性。所提出的STC策略提供了一种设计多功能可编程系统的新方法,将发现认知雷达和多用户无线通信等潜在应用。
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