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
王莎莎 1彭睿 1张正平 1杨鑫1
作者信息
- 1. 贵州大学 大数据与信息工程学院,贵州 贵阳 550000
- 折叠
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.
Abstract
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Key words
surface plasmon polarizations/metal-insulator-metal waveguides/bent waveguide/band-stop filters/circular cavity/filtering performance/finite element method引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据