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提出了一种光子晶体波导与随机介质相结合的特殊型波导的设计方法。基于光子晶体波导模型,建立了ZnO随机介质作为线缺陷的光子晶体波导模型,采用时域有限差分(FDTD)法分析了ZnO随机介质的加入对光子晶体波导系统的频率特性、时域特性及增益特性的影响,并且与纯随机介质系统和含有线缺陷的光子晶体波导系统进行对比。分析结果表明,当在光子晶体波导的缺陷层引入ZnO随机介质时,随机介质使得光在缺陷处振荡并得到放大,局域化程度比纯随机介质系统和纯光子晶体波导系统更高;且光与随机介质的相互作用使得光在波导中时间延长,激光阈值降低。这种光子晶体波导可用于制备可嵌入到集成光路领域和低阈值的微型激光器。
A design method of a special type of waveguide combined with a photonic crystal waveguide and a random medium is proposed. Based on the photonic crystal waveguide model, ZnO random medium was established as a model of photonic crystal waveguide with defect. The time-domain characteristics and gain of ZnO photonic crystal waveguide system were analyzed by FDTD method. Characteristics and compared with purely random medium systems and photonic crystal waveguide systems containing line defects. The results show that when the ZnO random medium is introduced into the defect layer of the photonic crystal waveguide, the random medium makes the light oscillate in the defect and get amplified, and the localization degree is higher than the pure random medium system and the pure photonic crystal waveguide system; and the light The interaction with the random medium causes the light to extend for a long time in the waveguide and the laser threshold decreases. Such photonic crystal waveguides can be used to make micro-lasers that can be embedded in the field of integrated optical circuits and with low thresholds.