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通过等频图分析并结合时域有限差分法法模拟,在Archimedes32,4,3,4结构排列的二维光子晶体中同一频率下同时实现了电磁波两种偏振态的自准直.研究发现,在该结构光子晶体中引入缺陷,当线缺陷宽度改变时,TE和TM两种偏振态光束的分束效果将会随之变化.由此通过控制缺陷宽度,分别实现了两种偏振态光束的50%:50%分束以及90°大角度光折弯,分束和折弯的效率都较为理想,为未来设计基于光子晶体的新型光子学器件提供了一种新的思路。
Through the analysis of the iso-frequency diagram and the finite-difference time-domain method, the self-collimation of the two states of the electromagnetic wave is simultaneously realized at the same frequency in the two-dimensional photonic crystal array with Archimedes 32,4,3,4 structure. When the defect width of the line is changed, the splitting effect of the two polarization beams of TE and TM will change accordingly, and by controlling the defect width, the polarization states of the two polarization beams 50%: 50% beam splitting and 90 ° wide angle beam bending, beam splitter and bending efficiency are ideal, which will provide a new idea for designing new photonic crystal based photonic devices in the future.