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采用时域有限差分法研究了二维八重准晶有机光子晶体的光传输特性,重点分析了光束在聚苯乙烯空气柱平板结构和聚苯乙烯介质柱结构中的透射特性与光局域特性。研究结果表明,即使在低折射率对比度的情况下,两种完整八重准晶平板结构中均出现了可见光波段的光子带隙和本征模,且光子带隙中心位置随着平板厚度的增大而红移。当在两种准晶结构中引入缺陷微腔时,带隙内的缺陷模产生位置和波长红移特性随着微腔结构的变化规律明显不同,这种差异性是由两种物理机制(即光子晶体缺陷能级变化与微腔所支持的驻波条件)共同作用的结果。这一研究结果将为实验制备有机准晶发光器件提供一定的理论基础。
The time-domain finite difference method was used to study the light transmission characteristics of two-dimensional octuploid ncrystal photonic crystal. The transmission characteristics and local optical properties of the beam in the polystyrene air column and polystyrene column were analyzed emphatically. The results show that the photonic bandgaps and eigenmodes in the visible region appear in both intact octupole plate structures even with low refractive index contrast, and the center position of the photonic bandgap increases with the increase of the plate thickness Redshift. When the defect microcavities are introduced into the two quasicrystal structures, the defect modes in the bandgaps and the redshift characteristics of the wavelength vary significantly with the variation of microcavity structure. This difference is caused by two physical mechanisms Photonic crystal defect level changes with the microcavity supported standing wave conditions) results. The results of this study will provide some theoretical basis for the experimental preparation of organic quasi-crystal light-emitting devices.