光子晶体的微腔特性

Properties of a Photonic Crystal Microcavity

为了设计一种高品质因子的光子晶体微腔和研究单缺陷光子晶体微腔谐振模波长随晶格常数的变化规律,使用时域有限差分法(differencetime domainmethod)和基于Baker算法的Pad啨近似方法计算了半导体材料上空气孔阵列光子晶体微腔的谐振模波长和品质因子.得到的新型光子晶体微腔的品质因子达246510,单缺陷光子晶体微腔模波长随晶格常数a和孔半径r的近似为线性变化关系:当孔半径r为一常数时,表现为晶格常数改变1nm,谐振波长变化约3nm,为实际制作光子晶体微腔激光器提供了理论指导.

In order to design a new type of photonic crystal microcavity with a high quality factor and to study the relationship between the resonant mode wavelength and the lattice constant of a single-defect photonic crystal microcavity, the finite difference time-domain method and the Padé approximation together with Baker＇s algorithm are employed to calculate the resonant mode wavelength and quality factor of air hole photonic crystal microcavities made of semiconductor material. The quality factor of this photonic crystal microcavity is 246510, and it has a linear relationship such that a change of three nanometers in the resonant mode wavelength results in a change of only one nanometer in the lattice constant of the single defect photonic crystal microcavity for a fixed hole radius. These results crystal microcavity lasers. provide theoretical instruction for fabricating photonic crystal microcavity lasers.