基于金属-介质布拉格光栅-金属的带阻滤波器结构
首发时间:2019-03-26
摘要:本文描述了一种基于周期性介质盘阵列插入金属-绝缘体-金属波导的透射式带阻滤波器。利用时域有限差分方法对该结构进行仿真并研究了该结构的特性。结果表明,在透射谱中存在一个平坦的阻带,其传输接近于零。通过调节圆盘阵列的晶格常数,可以控制滤波器的中心波长。一组适合设计带阻滤波器的参数被提供,该滤波器的平阻带宽度约为400 nm,具有优秀的高低电平投射比。该结构在纳米光学器件的设计中具有潜在的应用前景。
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Band-Stop Filter Based on a Metal/Insulator-Disk-Array/Metal Structure
Abstract:In this paper, we describe a band-stop filter based on a periodic dielectric-disk array inserted into a metal-insulator-metal waveguide. We use finite-difference time-domain methods to study the characteristics of our proposed structure. The results show that there is a flat stop band in the transmission spectrum, in which the transmission is close to zero. The central wavelength of the filter can be controlled by adjusting the lattice constant of the disk array. We provide a set of parameters suitable for designing a band-stop filter that has a flat stop band width of approximately 400 nm and a superior on/off ratio. Our structure has potential applications in the design of nanoscale optical devices.
Keywords: optics surface plasmon polaritons bragg grating band-stop filter
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