Numerical method for the analysis of a silicon wire optical waveguide and its application to the design of novel functional devices

具有三角形横截面的硅线波导可以用几微米的短器件长度旋转偏振。操作机制的理论解释与实验演示在微波频率。本文提出了一种新的隐式时域有限差分法，它可以一次性计算各种光学器件的频率响应。该方法被应用到波导型传感器的设计。

A silicon wire waveguide with a triangular cross section can rotate the polarization with a short device length of a few micrometers. The operation mechanism is theoretically explained together with an experimental demonstration at a microwave frequency. A novel implicit finite-difference time-domain method has been developed, which allows us to evaluate the frequency response of various optical devices at a one-time solution. The method is applied to the design of a waveguide-type sensor.