人工表面等离激元超材料

以微带为代表的传统微波传输线无法精细操控电磁模式,因此传统电子信息系统在空间耦合、动态响应和性能鲁棒性等方面存在瓶颈。人工表面等离激元(SSPP)超材料可打破上述瓶颈,是光学与信息领域的研究热点之一。人工表面等离激元超材料是一类模拟光频段表面等离激元特性的新型超材料,可在微波和太赫兹频段精细操控表面波,具有与平面电路相似的构型特性,可用于制备下一代集成电路的基础传输线。人工表面等离激元分为传输型和局域型两类。传输型人工表面等离激元超材料始于三维立体结构,后发展成超薄梳状金属条带构型。学者们构建了以其为基础的微波电路新体系,研制了人工表面等离激元滤波器、天线、放大器和倍频器等典型的无源和有源器件,并将其集成为可实现亚波长间距多通道信号非视距传输的无线通信系统。人工局域表面等离激元(SLSP)超材料也经历了从三维立体构型到超薄构型的发展历程,并通过螺旋构型、链式构型、高阶模式和杂化模式等为电磁波的亚波长尺度调控提供了更多自由度。系统讨论了人工表面等离激元超材料在微波电路中的相关理论和应用,包括人工表面等离激元超材料的基本概念、构型发展、无源/有源器件以及无线通信系统。

Spoof Plasmonic Metamaterials

Traditional microwave transmission lines such as micro-strips cannot precisely manipulate electromagnetic modes, and hence traditional electronic information systems suffer from some bottlenecks such as spatial coupling, dynamic response, and performance robustness. To this end, metamaterials of spoof surface plasmon polaritons(SSPPs) provide a strategy to break these bottlenecks and have attracted many research interests in optical and information fields. To be specific, SSPP metamaterials can mimic the behaviors of optical surface plasmon polaritons and manipulate the electromagnetic fields at microwave and terahertz frequencies. Furthermore, with the configurational characteristics similar to those of planar circuits, the SSPP structures can be used to prepare the basic transmission lines of the next generation of integrated circuits. In addition, SSPPs can be divided into the propagation type and the localized type. The propagation type SSPPs, beginning with the three-dimensional structures, have been developed into the ultrathin corrugated metallic strip configurations. Based on the above configuration, scholars have established a new framework for microwave circuits and prepared typical passive and active SSPP devices including filters, antennas, amplifiers and frequency multipliers. Recently, an SSPP wireless communication system has been reported, which can achieve the non-line-of-sight wireless communications of sub-wavelength-spacing multichannel signals. Similarly, the spoof localized surface plasmon(SLSP) metamaterials have also developed from the three-dimensional structures to the ultrathin configurations, and have adopted spiral configuration, chain configuration, high-order mode, and hybridization mode to provide more degrees of freedom for the sub-wavelength scale control of electromagnetic waves. Finally, we systematically discussed the related theories and applications of SSPP metamaterials in the microwave circuits, including the basic concepts and configuration evolution of SSPP metamaterials, the passive and active SSPP devices, and the wireless communication system.