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第一次在理论上提出了级联的金属-电介质-金属波导结构。此结构由一个一级T型表面等离子体波导和两个二级T型表面等离子体波导组成。利用来自二级T型表面等离子体波导的波导模式之间的干涉,表面等离子体可以沿着一只输出臂传播。在设计的参数下,波长为1 310和1 550 nm的表面等离子体模式可以分别沿着方向相反的输出臂传播,从而实现双色分束。利用有限时域差分法数值模拟电磁场的稳态分布,从而验证了本研究的理论设计。
For the first time, cascaded metal-dielectric-metal waveguide structures have been proposed theoretically. This structure consists of a first-order T-type surface plasmon waveguide and two second-order T-type surface plasmon waveguides. Using interference between waveguide modes from secondary T-type surface plasmon waveguides, surface plasmons can propagate along one output arm. Under the design parameters, surface plasmon modes with wavelengths of 1 310 and 1 550 nm propagate along opposite directions of output arms, respectively, resulting in two-color beam splitting. The finite-time difference method is used to simulate the steady-state distribution of the electromagnetic field, which verifies the theoretical design of this study.