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用特征矩阵法研究了带缺陷的一维光子晶体的透射性质 ,并提出了新的可调谐光滤波器的概念 .一维光子晶体 (L1 H1 ) m 带有LcH2 (L2 H2 ) n 形式的缺陷时 ,在光子晶体中间出现了窄的透射峰 ,其他级次的干涉峰则随着覆盖层H2 (L2 H2 ) n 周期数的增大而减弱并消失 .当耦合层Lc 厚度变化时 ,在光子晶体禁带边缘附近出现两个高透射率区域 .高透射率区域透射峰的特性由光子晶体和覆盖层的性质决定 .当光子晶体禁带宽度较小时 ,两个高透射率区域接近 ,形成具有约 15 0nm调谐范围的区域 ,因此可制备以一维光子晶体为基础的新型可调谐光滤波器 .
The transmission properties of a one-dimensional photonic crystal with defects are investigated by using the characteristic matrix method and a new concept of a tunable optical filter is proposed. The one-dimensional photonic crystal (L1 H1) m has a defect of the form LcH2 (L2 H2) n , There is a narrow transmission peak in the middle of the photonic crystal and the interference peaks of other levels weaken and disappear with the increase of the number of cycles of the H2 (n) H2 n.When the thickness of the coupling layer Lc changes, Two high-transmittance regions appear near the edge of the forbidden band.The characteristic of the transmission peak in the high-transmittance region is determined by the properties of the photonic crystal and the cap layer.When the photonic crystal has a smaller forbidden band width, the two high-transmittance regions are close to each other, About 15 0nm tuning range of the region, it can be prepared based on one-dimensional photonic crystal tunable optical filter.