Comprehensive analysis method of nonlinear optical wave-guiding phenomena by 3-dimensional nonlinear FDTD parallel computation

这项研究旨在建立一种全面的数值方法来理解复杂的光波在非线性介质和波导器件中的传播。本研究课题的具体内容包括：1、半导体微环谐振器增强四波混频的时域有限差分(FDTD)分析，优化谐振腔结构以提高光波长转换效率；2、降低开关阈值功率的光双稳光波导器件的FDTD分析和设计优化。这些器件是在高速光通信技术中实现高效波长转换和全光集成电路的潜在候选者，最近受到了非常活跃的研究。在文1中，通过将半导体材料的色散效应和特定波导结构的色散效应纳入FDTD分析，从而使泵浦、信号和转换光的波长与环形谐振器的谐振相匹配，波长转换装置的性能得到了改善。2.应用FDTD分析方法对波导结构进行了优化，以实现有效的低开关阈值双稳器件，结果表明开关阈值已降至现有半导体激光器的功率水平。

This study aims to establish a comprehensive numerical method of understanding the complicated optical wave propagation in nonlinear media and waveguide devices. Particular themes of this research project are 1; finite-difference time-domain (FDTD) analysis of enhanced four-wave mixing in a semiconductor micro-ring resonator, and optimization of the resonator configuration in order to improve the optical wavelength conversion efficiency, and 2; FDTD analysis and design optimization of optical bi-stable waveguide devices for the reduction of their switching threshold power. These devices are prospective candidates for the realization of efficient wavelength conversion and all-optical integrated logic circuits in high-speed optical communication technology, and are recently very actively investigated. In 1, by taking into the FDTD analysis both the dispersion effects of semiconductor material and those of particular waveguide configuration, thereby matching the wavelength of the pump, signal, and converted light waves with the resonances of the ring resonator, the performance of the wavelength conversion device has been shown to be improved. In 2, the FDTD analysis has been applied to optimize the waveguide structure in order to realize effective low switching-threshold bi-stable devices; it has been shown that the switching threshold has been reduced to the power level of currently available semiconductor lasers.