Cheng Zhang Wen, Wang Meng, You Zi Hua, Ma Hui Feng, Cui Tie Jun
State Key Laboratory of Millimeter Waves, School of Information Science and Engineering, Southeast University, Nanjing 210096, People's Republic of China.
J Phys Condens Matter. 2022 Apr 28;34(26). doi: 10.1088/1361-648X/ac6558.
Surface plasmon polaritons (SPPs) are interactions between incident electromagnetic waves and free electrons on the metal-dielectric interface in the optical regime. To mimic SPPs in the microwave frequency, spoof SPPs (SSPPs) on ultrathin and flexible corrugated metallic strips were proposed and designed, which also inherit the advantages of lightweight, conformal, low profile, and easy integration with the traditional microwave circuits. In this paper, we review the recent development of SSPPs, including the basic concept, design principle, and applications along with the development from unwieldy waveguides to ultrathin transmission lines. The design schemes from passive and active devices to SSPP systems are presented respectively. For the passive SSPP devices, the related applications including filters, splitters, combiners, couplers, topological SSPPs, and radiations introduced. For the active SSPP devices, from the perspectives of transmission and radiation, we present a series of active SSPP devices with diversity and flexibility, including filtering, amplification, attenuation, nonlinearity, and leaky-wave radiations. Finally, several microwave systems based on SSPPs are reported, showing their unique advantages. The future directions and potential applications of the ultra-thin SSPP structures in the microwave and millimeter-wave regions are discussed.
表面等离激元极化激元（SPPs）是光频段入射电磁波与金属 - 电介质界面上自由电子之间的相互作用。为了在微波频率下模拟SPPs，人们提出并设计了超薄柔性波纹金属条上的类表面等离激元极化激元（SSPPs），其还继承了重量轻、可共形、低剖面以及易于与传统微波电路集成的优点。在本文中，我们回顾了SSPPs的最新进展，包括基本概念、设计原理和应用，以及从笨重的波导到超薄传输线的发展历程。分别介绍了从无源和有源器件到SSPP系统的设计方案。对于无源SSPP器件，介绍了包括滤波器、功分器、合路器、耦合器、拓扑SSPPs和辐射等相关应用。对于有源SSPP器件，从传输和辐射的角度，我们展示了一系列具有多样性和灵活性的有源SSPP器件，包括滤波、放大、衰减、非线性和漏波辐射。最后，报道了几种基于SSPPs的微波系统，展示了它们的独特优势。讨论了超薄SSPP结构在微波和毫米波频段的未来发展方向和潜在应用。
