Beijing Innovation Center for Future Chip, State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing, 100084, P.R. China.
Luoyang Optoelectro Technology Development Center, Luoyang, 471009, P.R. China.
Sci Rep. 2017 Sep 5;7(1):10576. doi: 10.1038/s41598-017-11332-8.
In this paper, we propose a scheme to construct a new type of ultra-compact rejection filter by loading split-ring resonators (SRRs) on the transmission line of spoof surface plasmon polaritons (SPPs). From the dispersion analysis of the spoof SPP transmission line with and without the SRR loading, we clearly reveal the mechanism of the rejection characteristic for this compact filter. Meanwhile, we fabricate two spoof SPPs waveguides loaded with different amounts of metamaterials particles, and experimentally test them using an Agilent Vector Network Analyzer (VNA) and a homemade near-field scanning system. Both the simulated and measured results agree well with our theoretical analysis and demonstrate the excellent filtering characteristics of our design. The isolation of both filters can be less than -20 dB, and even reach -40 dB at rejection frequencies. The proposed rejection and stop-band filters show important potentials to develop integrated plasmonic functional devices and circuits at microwave and terahertz frequencies.
在本文中，我们提出了一种通过在赝表面等离激元（SPP）传输线加载分裂环谐振器（SRR）来构建新型超紧凑带阻滤波器的方案。通过对加载和未加载 SRR 的赝 SPP 传输线的色散分析，我们清楚地揭示了这种紧凑滤波器的带阻特性的机制。同时，我们制造了两个加载有不同数量超材料颗粒的赝 SPP 波导，并使用安捷伦矢量网络分析仪（VNA）和自制的近场扫描系统对其进行了实验测试。模拟和测量结果都与我们的理论分析吻合较好，证明了我们设计的滤波特性优良。两个滤波器的隔离度可以小于-20dB，甚至在阻带频率处达到-40dB。所提出的带阻滤波器和阻带滤波器在开发微波和太赫兹频率的集成等离子体功能器件和电路方面具有重要的潜力。
