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文中采用有限时域差分(FDTD)法研究了Zn O随机介质与光子晶体波导相结合的微型激光器的辐射特性和频谱特性,用平面波展开法分析了光子晶体能带特性。数值研究结果表明:由于光与随机介质相互作用,使得光在该微型激光器中放大,损耗减小,存在较长滞留时间,同时随机介质局域光的能力变强,激光的阈值降低,而且含四方格子结构光子晶体的激光器具有良好的激光特性和调制作用。该新型器件的设计与研究将为研制可嵌入集成光子芯片的、低阈值的微型激光器提供理论基础。
In this paper, the finite difference time-domain (FDTD) method is used to study the radiation and spectral characteristics of a micro-laser combined with a Zn O stochastic medium and a photonic crystal waveguide. The band characteristics of photonic crystals are analyzed by plane wave expansion. The numerical results show that due to the interaction between light and random medium, the light is amplified in the micro-laser, the loss is reduced and there is a long residence time. Meanwhile, the ability of local light in random medium becomes stronger and the laser threshold decreases. Quartet structured photonic crystal lasers have good laser characteristics and modulation effects. The design and research of this new device will provide the theoretical basis for the development of low threshold micro-laser which can embed the integrated photonic chip.