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提出一种中心波长随槽型腔腔长线性变化、透射率随耦合距离可调的级联腔表面等离子体滤波器。该滤波器由输入波导、两个级联的介质槽型腔和输出波导组成。通过级联两个相同的槽型腔,共振模被分离从而实现窄带的双通道滤波器;进一步调节输出波导的位置,能够将双通道分离,实现单通道的滤波。通过时域有限差分法和耦合模理论对模型进行仿真分析,结果表明,该滤波器的最小半高宽低至20nm。同基于单槽型腔的滤波器相比,半高宽显著减小。
A cascade cavity surface plasmon filter whose center wavelength varies linearly with cavity length and whose transmittance varies with the coupling distance is proposed. The filter consists of an input waveguide, two cascaded media slots and an output waveguide. By cascading two identical slot cavities, the resonant modes are separated to achieve a narrow-band, two-channel filter; further tuning the position of the output waveguide can separate the two channels to achieve single-channel filtering. The time-domain finite difference method and coupled-mode theory are used to simulate the model. The results show that the minimum FWHM of the filter is as low as 20 nm. The half-width is significantly reduced compared to a single-slot cavity-based filter.