Čtyroký Jiří, Gonzalo Wangüemert-Pérez Juan, Kwiecien Pavel, Richter Ivan, Litvik Ján, Schmid Jens H, Molina-Fernández Íñigo, Ortega-Moñux Alejandro, Dado Milan, Cheben Pavel
Opt Express. 2018 Jan 8;26(1):179-194. doi: 10.1364/OE.26.000179.
Properties of reflection and transmission spectral filters based on Bragg gratings in subwavelength grating (SWG) metamaterial waveguides on silicon-on-insulator platform have been analyzed using proprietary 2D and 3D simulation tools based on Fourier modal method and the coupled-mode theory. We also demonstrate that the coupled Bloch mode theory can be advantageously applied to design of Bragg gratings in SWG waveguides. By combining different techniques, including judiciously positioning silicon loading segments within the evanescent field of the SWG waveguide and making use of its dispersion properties, it is possible to attain sub-nanometer spectral bandwidths for both reflection and transmission filters in the wavelength range of 1550 nm while keeping minimum structural features of the filters as large as 100 nm. Numerical simulations have also shown that a few nanometer jitter in the size and position of Si segments is well tolerated in our filter designs.
基于绝缘体上硅平台的亚波长光栅（SWG）超材料波导中的布拉格光栅的反射和透射光谱滤波器的特性，已使用基于傅里叶模态方法和耦合模理论的专有二维和三维模拟工具进行了分析。我们还证明了耦合布洛赫模理论可有利地应用于SWG波导中布拉格光栅的设计。通过结合不同技术，包括在SWG波导的倏逝场内明智地定位硅加载段并利用其色散特性，有可能在1550 nm波长范围内实现反射和透射滤波器的亚纳米光谱带宽，同时保持滤波器的最小结构特征大至100 nm。数值模拟还表明，在我们的滤波器设计中，硅段的尺寸和位置上的几纳米抖动是可以很好容忍的。
