基于圆形腔的表面等离子体带阻滤波器研究  

Research on surface plasmon band-stop filter based on circular resonant cavities

作　　者：王莎莎 彭睿 张正平 杨鑫 WANG Shasha;PENG Rui;ZHANG Zhengping;YANG Xing(College of Big Data and Information Engineering,Guizhou University,Guiyang550000,China)

机构地区：[1]贵州大学大数据与信息工程学院,贵州贵阳550000

出　　处：《电子元件与材料》2024年第6期735-742,共8页Electronic Components And Materials

摘　　要：为研究弯曲波导结构的双边耦合效应对耦合强度的影响,提出一个弯曲波导耦合内嵌十字银条的圆形空腔带阻滤波器,采用有限元法对滤波器结构进行仿真分析。与现有直波导耦合内嵌十字银条的圆形空腔结构对比,弯曲波导结构具有更好的滤波性能,例如最小透射率降低10.44%;改变银条尺寸时模式2阻带透射率值降低近60%。进一步研究表明,通过调整内嵌银条尺寸及相对角度能够实现共振波长调谐、单频带与双频带的切换以及对半峰带宽等的控制,最小半峰带宽分别为11.0152 nm和9.9869 nm。并且对于介质折射率的变化(变化范围为1~1.12),该结构折射率灵敏度保持恒定。所提出的滤波器结构具有良好的频选及窄带带阻滤波特性,在窄带滤波和波分复用等系统中具有重要应用价值。To investigate the bilateral coupling effect of the bent waveguide structure on the coupling strength,a bent waveguide-coupled circular cavity band-stop filter was proposed with embedded cross silver bars.The filter structure was simulated and analyzed using finite element method.Compared with the existing straight waveguide-coupled circular cavity structure with embedded cross silver bars,the bent waveguide structure has better filtering performance.For instance,the minimum transmittance can be reduced by 10.44%,and the mode 2 blocking-band transmittance can be reduced by nearly 60%when the size of the silver bars is varied.Further studies show that,by adjusting the size and relative angle of the embedded silver bars,the tuning of resonance frequency,the switching between single-band and dual-band,and the control of the half-peak bandwidth can be realized with the minimum half-peak bandwidths of 11.0152 nm and 9.9869 nm,respectively.Moreover,the refractive index sensitivity of the structure remains constant at refractive index of the dielectric from 1 to 1.12.The proposed filter structure has good frequency-selective and narrow-band band-stop filtering characteristics,which is of great application value in narrow-band filtering and WDM systems.

关 键 词：表面等离子体激元 金属-介质-金属波导 弯曲波导 带阻滤波器 圆形空腔 滤波性能 有限元法 

分 类 号：TN252[电子电信—物理电子学]