基于MIM波导缺陷谐振环结构的传输特性研究

发布时间：2018-06-18 18:44

本文选题：光学器件 + MIM波导　；参考：《湖南大学学报(自然科学版)》2014年08期

【摘要】：应用时域有限差分方法(FDTD)研究了基于金属-介质-金属(MIM)波导缺陷谐振环结构的传输特性.该结构由一通道波导和位于通道上方的缺陷谐振环组成,与无缺陷谐振腔结构相比,缺陷谐振环结构破坏了环形腔原有的共振模式,从而呈现出新颖的滤波特性.当缺陷尺寸发生改变时,谐振环有效长度发生变化,通过调整缺陷的尺寸,可以有效调节滤波波长,其数值计算值与传输线理论值基本吻合.此外,通道波导与谐振环间的耦合强度在一定程度上依赖于缺陷的位置,因此通过调节缺陷的位置可以有效控制滤波强度.与其他滤波器相比,此结构在不改变结构总尺寸的情况下,可调节滤波波长,实现了更宽频段的滤波,并有效调节其透射率.当缺陷尺寸设定为某一特定值时,能实现模式间的简并,提高滤波性能.
[Abstract]:A finite difference time-domain method (FDTD) is used to study the propagation characteristics of a defective resonant ring structure based on metal-dielectric / metal Mimm waveguide. The structure consists of a channel waveguide and a defect resonant ring located above the channel. Compared with the non-defect resonator structure, the defect resonant ring structure destroys the original resonant mode of the ring cavity, thus showing novel filtering characteristics. When the size of the defect changes, the effective length of the resonant ring changes. By adjusting the size of the defect, the filter wavelength can be adjusted effectively, and the numerical value is in good agreement with the theoretical value of the transmission line. In addition, the coupling strength between the channel waveguide and the resonant ring depends on the position of the defect to some extent, so the filter intensity can be effectively controlled by adjusting the position of the defect. Compared with other filters, the structure can adjust the filter wavelength without changing the total size of the structure, realize the filter in a wider frequency band, and adjust its transmittance effectively. When the defect size is set to a certain value, the degeneracy between modes can be realized and the filtering performance can be improved.
【作者单位】：湖南大学物理与微电子科学学院;
【基金】：国家自然科学基金资助项目(11074069,61176116)
【分类号】：TN814

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