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采用有限时域差分法,研究了内嵌金属块长度与夹缝宽度对金属-绝缘体-金属波导结构的光透射特性的影响。研究发现,此结构相比较于单一直波导而言,出现了一个很明显的透射峰。并且当金属块的长度较大时,其与波导上表面的金属之间形成的夹缝会构成法布里-珀罗腔,高阶共振模式被激发,能量在腔内不断谐振,从而产生多个不断衰减的共振峰。同时,提出了一种基于内嵌双金属块结构的表面等离激元带通滤波器,此滤波器在共振峰以外波段的透射率可以下降为0,且其共振波长可以通过改变金属块的长度等参数进行调节。
The finite difference time-domain method is used to study the influence of the embedded metal block length and the width of the nip on the light transmission of the metal-insulator-metal waveguide structure. The study found that this structure appears to have a distinct transmission peak compared to a single straight waveguide. And when the length of the metal block is large, the nip formed between the metal block and the metal on the upper surface of the waveguide forms the Fabry-Perot cavity. The high-order resonance mode is excited, and the energy continuously resonates in the cavity to generate a plurality of Decaying resonance peak. At the same time, a surface plasmon band-pass filter based on an embedded bimetallic block structure is proposed. The transmittance of this filter can be reduced to 0 in the band beyond the formant and its resonant wavelength can be changed by changing the Length and other parameters to be adjusted.