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

具有三角形截面的硅线波导可以在几微米的短器件长度内旋转偏振。从理论上解释了它的工作机理，并给出了微波频率下的实验演示。发展了一种新的隐式时域有限差分方法，它可以一次性地计算各种光学器件的频率响应。将该方法应用于波导型传感器的设计中。

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.