Li Zhuo, Xu Jia, Chen Chen, Sun Yunhe, Xu Bingzheng, Liu Liangliang, Gu Changqing
Appl Opt. 2016 Dec 20;55(36):10323-10328. doi: 10.1364/AO.55.010323.
In this work, a wideband band-stop plasmonic filter based on localized spoof surface plasmons is reported, which consists of a coplanar waveguide (CPW) and an ultra-thin periodic corrugated metallic strip with defect units at the back of the substrate. Defect units are used to localize the transmission energy along the CPW. Each defect unit can introduce a narrow stop band, and a series of defect units is judiciously designed to form a broadband CPW band-stop filter. The center frequency and bandwidth of the filter can be tuned by the heights and numbers of the defect units. In addition, a T-shaped unit is designed to increase the equivalent height of the lateral branch so as to realize the miniaturization of the vertical geometric dimension. Theoretical analysis of the filter has been conducted, and a sample at microwave frequency has been fabricated and measured to validate our design. This simple band-stop plasmonic filter can find potential applications in plasmonic circuits and antennas at microwave and terahertz frequencies.
在这项工作中，报道了一种基于局域化类表面等离子体激元的宽带带阻等离子体滤波器，它由一个共面波导（CPW）和一个位于衬底背面的带有缺陷单元的超薄周期性波纹金属带组成。缺陷单元用于沿CPW定位传输能量。每个缺陷单元可引入一个窄带阻，一系列缺陷单元经过精心设计以形成一个宽带CPW带阻滤波器。滤波器的中心频率和带宽可通过缺陷单元的高度和数量进行调谐。此外，设计了一个T形单元以增加横向分支的等效高度，从而实现垂直几何尺寸的小型化。对该滤波器进行了理论分析，并制作并测量了一个微波频率的样品以验证我们的设计。这种简单的带阻等离子体滤波器在微波和太赫兹频率的等离子体电路和天线中具有潜在应用。
