三角形腔耦合MIM波导的禁带滤波和传感特性研究  

Bandgap filtering and sensing characteristics of triangular cavity coupled MIM waveguides

作　　者：杨凤英 程龙 陈跃刚 YANG Fengying;CHENG Long;CHEN Yuegang(Guizhou Qiannan College of Science and Technology,Huishui 550600,China;School of Physics,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州黔南科技学院,贵州惠水550025 [2]贵州大学物理学院,贵州贵阳550025

出　　处：《贵州科学》2025年第2期91-96,共6页Guizhou Science

基　　金：国家自然科学基金(11764006);贵州省高等学校教学内容和课程体系改革项目(2021369,2022369);贵州省教育科学规划项目(2022C017)。

摘　　要：光学谐振腔的选频特性在微纳光电子器件中具有重要应用。本文在金属-介质-金属波导的侧面设计多三角形腔以实现禁带滤波器。首先,利用时域有限差分法计算2个三角形微腔结构的光谱响应曲线,结合电磁场分布分析模式的共振物理机制。其次,改变三角形腔的结构参数,对应透射谱线的共振波长发生漂移,基于此性质对滤波特性进行调节之后,增加三角形腔的数量N,该滤波器的禁带带隙宽度逐渐增大并趋近饱和状态;当数量N=5时,禁带宽度最大可达495 nm。最后,改变腔内物质的折射率,计算得到该滤波器的灵敏度最高可达1850 nm/RIU,品质因数最高可达7.13×10^(6),可用于病原病毒的检测。本文设计的结构在宽带滤波器和纳米传感器方面具有潜在的应用前景。The frequency selection characteristics of optical resonators have important applications in micro and nano optoelectronic devices.In this paper,multi triangular cavities are designed on the side of the metal-dielectric-metal waveguide to form a bandgap filter.Firstly,the spectral response curves of the two triangular microcavities are calculated by finite-difference time-domain method,and the resonance mechanism of the electromagnetic field distribution model is analyzed.Secondly,by changing the structure parameters of the triangular cavities,the resonant wavelength of the corresponding transmission spectral line shifts,and the filtering characteristics are adjusted based on this property.Then,with the increase of the number of triangular cavities(N),the bandgap width of the filter gradually increases and approaches the saturation state.When N=5,the maximum bandgap width reaches 495 nm.Finally,by changing the refractive index of the material in the cavity,the sensitivity of the filter reaches up to 1850 nm/RIU,and the quality factor reaches up to 7.13×10^(6),which can be used for the detection of pathogenic viruses.The structure designed in this paper has potential application prospects in wideband filters and nanosensors.

关 键 词：表面等离子激元 三角形谐振腔 波导 禁带滤波 纳米传感 

分 类 号：O441.4[理学—电磁学] TP212[理学—物理]