双Loop-Stub侧边耦合波导结构多重等离激元诱导透明效应的数值分析

Numerical Analysis of Multiple Plasmon-Induced Transparency Effects of Side-Coupled Waveguide with Double Loop-Stub

研究同侧、异侧和反对称双loop-stub(LS)谐振腔侧边耦合波导结构中的多重类电磁诱导透明效应,并利用有限元方法分别对这三种结构的光学透射特性进行数值模拟。结果表明,这三种结构的透射谱、磁场分布和色散强烈地依赖结构参数。着重讨论双LS谐振腔相邻两个stub腔的距离或两个水平分支的距离对透射特性的影响。随着距离的减小,两个LS腔之间的耦合增强,出现多个透射峰和透射谷(即阻带),多重类电磁诱导透明效应显著。此外,讨论了同侧双LS腔波导结构相邻两个stub腔的距离为零时,竖直分支宽度、水平分支宽度、总水平分支长度等参数对透射谱的影响。侧边耦合金属纳米波导结构在未来的集成光学有潜在的应用价值,如滤波器、传感器和慢光装置等。

This paper investigates the multiple electromagnetically-induced transparency-like(EIT-like)effects of the ipsilateral,opposite-side,and antisymmetric double loop-stub(LS)resonator side-coupled waveguides.By the finite element method,numerical simulation is conducted on the optical transmission properties of the three waveguides.The results show that the transmission spectrum,magnetic field distribution,and dispersion of the three waveguides strongly depend on structure parameters.Moreover,this paper puts emphasis on the study of the influence of the distance between two adjacent stub resonators or the distance between two horizontal branches of double LS resonators on transmission properties.When the distance decreases,the coupling between two LS resonators gradually increases,and more transmission peaks and dips(i.e.,the stop bands)are observed,which indicates that the multiple EIT-like effects are significantly enhanced.In addition,in the case of the ipsilateral waveguide,when the distance between the two stub resonators is zero,the effects of the vertical branch width,horizontal branch width,and total horizontal branch length on the transmission spectrum are discussed.These side-coupled metal nanowaveguides have potential applications in future integrated optics,such as filters,sensors,and slow light devices.