聚甲基丙烯酸甲酯光子晶体的生长和结构分析

金属/半导体基光子晶体有重大的国防应用价值,其生长技术的核心是设计合适的方法将聚甲基丙烯酯甲酯(PMMA)微球组装成光子晶体。在目前垂直沉积法的基础上,通过控制甲基丙烯酸甲酯(MMA)和偶氮引发剂的反应,使用等温蒸发工艺开发了光子晶体的可控垂直沉积(CVD)技术。实验合成了高度单分散的PMMA微球,并将PMMA微球组装成了光子晶体;对试样进行扫描电镜研究发现,晶体内部排列有序度很高,表面层很完美平整,在3μm×5μm的有序区内仅有两个点缺陷;使用直径分别为294nm和345nm的PMMA微球,沉积出具有规则的周期性密堆积结构的光子晶体,试样的完美有序区范围在20μm以上。实验发现,在可控垂直沉积法的晶体生长过程中,光子晶体的生长方式为连续生长,生长界面为粗造界面。

Growth and Microstructure Analysis of PMMA Photonic Crystal

Metal/semiconductor photonic crystals (PCs) will be applied in important national defense technology, the research focus of its growth is to how to assemble the PMMA microsphere into colloidal crystal. Based on the well-established vertical deposition method and isothermal evaporation processing, a controllable vertical deposition (CVD) method was developed to prepare the photonic crystal in the study. The highly monodisperse PMMA colloid particles with size of 294 nm and 345 nm were synthesized from the MMA and azo-initiator and assembled into photonic crystals by the technology; it was shown from the SEM observation of the sample that the bulk structure of the crystal has a high periodical array, the perfect order zone is above 20 μm; the surface structure of the crystal is completely flat and has only two defects in the 3 μm×5 μm order zone. It was concluded from the growth interface analysis that during the process of controllable vertical deposition, the crystals grow by continuous growth mechanism and the growing crystals have rough interface.