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构造和研究了光子晶体插入式二元缺陷和替代式二元缺陷微腔的光学传输特性,结果表明:随着二元缺陷自身周期数增大,微腔透射谱中分立缺陷模的数目增加,且替代式二元缺陷微腔分立缺陷模多于插入式二元缺陷微腔;随着缺陷高折射率介质厚度的增大,二元缺陷微腔的缺陷模向中间靠拢呈现简并趋势,同时禁带两侧出现多组双缺陷模,且高频一侧出现双缺陷模多于低频一侧,但替代式二元缺陷微腔出现的双缺陷模数目多于插入式二元缺陷微腔;随着缺陷低折射率介质厚度增大,插入式二元缺陷微腔的缺陷模向低频方向移动同时呈现耦合分开趋势,且透射率逐渐降低,而替代式二元缺陷微腔的缺陷模则向中间靠拢呈现简并趋势,同时缺陷模整体向高频方向缓慢移动,而透射率保持100%不变。光子晶体二元缺陷微腔的光传输特性为光学滤波器、光学开关和激光器等的设计提供了参考。
The results show that the number of discrete defects in the microcavity transmission spectrum increases with the increase of the periodic number of binary defects, And the number of discrete defects in the micro-cavity of the alternative binary defect is more than that of the binary micro-cavity of the inserted micro-cavity. With the increase of the thickness of the defect high refractive index medium, the defect mode of the binary defect microcavity tends to degenerate toward the middle, There are multiple pairs of double defect modes on both sides of the band gap, and there are more double defect modes on the high frequency side than on the low frequency side. However, there are more double defect modes in the alternative micro-cavity than in the binary micro-cavity ; As the thickness of the defect low refractive index medium increases, the defects of the inserted binary defect microcavity move toward the lower frequency and show a decoupling tendency and the transmittance decreases gradually. However, the defect modes of the alternative binary defect microcavity Degenerate toward the middle of the trend show the same time, the entire defect mode to slow the high-frequency direction, while the transmission rate remained unchanged 100%. The optical transmission properties of the binary defect photonic crystal microcavities provide a reference for the design of optical filters, optical switches and lasers.