Han Chao, Wang Zhaohong, Chu Yangyang, Zhao Xiaodan, Zhang Xuanru
Opt Lett. 2018 Apr 15;43(8):1898-1901. doi: 10.1364/OL.43.001898.
A compact flexible multifrequency splitter based on an arc waveguide constructed of plasmonic metallic grating structures with graded-height T-grooves is proposed and studied. The dispersion curves and cutoff frequencies of the plasmonic grating waveguides with different T-groove metallic grating heights are different. The guided spoof surface plasmonic polariton waves at different frequencies can be localized at dissimilar angles along the graded grating arc waveguide. The output flexibility at an arbitrary groove for different frequencies is realized by introducing an additional symmetrical T-groove structure as an output. The compact four-, seven-, and eight-output frequency splitters demonstrate its flexible multifrequency separation capability at different output angle locations, while the dimensional size of the frequency splitters is not increased. Measurement results at the microwave frequency display excellent agreement with numerical simulation results.
提出并研究了一种基于具有渐变高度 T 型槽的等离子体金属光栅结构构成的弧形波导的紧凑型柔性多频功分器。不同 T 型槽金属光栅高度的等离子体光栅波导的色散曲线和截止频率各不相同。不同频率的导引类表面等离子体激元波可以沿着渐变光栅弧形波导在不同角度处局域化。通过引入一个额外的对称 T 型槽结构作为输出，实现了不同频率在任意槽处的输出灵活性。紧凑型四输出、七输出和八输出频率功分器展示了其在不同输出角度位置的灵活多频分离能力，同时功分器的尺寸并未增加。微波频率下的测量结果与数值模拟结果显示出极佳的一致性。
