摘要
为了获得可调控的双重Fano共振效应并实现高灵敏度折射率传感,文章提出了一种H型谐振腔近场耦合含金属挡板的金属-电介质-金属(MDM)波导结构。采用有限元法分析了该波导结构的透射谱线对结构参数及填充介质折射率的依赖关系。计算结果表明,在尺寸为300 nm×300 nm的H型谐振腔结构中可以产生中心波长分别为810和1 350 nm的纵向及横向一阶谐振模式,两种谐振模耦合进入含挡板直波导将产生具有反对称线型的双重Fano共振透射峰。经拟合计算得到这两个非对称透射峰的折射率传感灵敏度分别为750和1 360 nm/RIU。该结构为片上集成的纳米级折射率传感器设计提供了有效依据。
In order to achieve tunable dual Fano resonance effect and high sensitivity refractive index sensing design, an H-shaped waveguide resonator is proposed to couple with the Metal-Dielectric-Metal(MDM) waveguide containing a single metal baffle in the middle part. The transmission spectra of the proposed structure have been calculated through the finite element method. It is demonstrated that double sharp and asymmetric transmittance peaks are emerged at the wavelengths around 810 and 1 350 nm respectively, which are generated by the double Fano resonances occurred vertically and horizontally in the H-shaped resonator with dimension of 300 nm×300 nm. Furthermore, the dependence of the transmission peaks on the structural parameters and refractive index of the H-shaped resonator have been discussed in detail. Finally, the double transmission peaks with the respective sensitivity of 750 and 1 360 nm/RIU have been achieved simultaneously in the proposed structure, which provide guidance for the design of nano-scale biosensors.
作者
尤鑫晨
关建飞
YOU Xin-chen;GUAN Jian-fei(College of Electronic and Optical Engineering&College of Microelectronics,Nanjing University of Posts and Telecommunications,Nanjing 210023,China)
出处
《光通信研究》
2021年第6期57-61,67,共6页
Study on Optical Communications
基金
国家自然科学基金资助项目(61775102,61905177)
南京邮电大学科研基金资助项目(NY214058,NY220050)。
