【摘要】 研究了由正和负两种折射率介质交替排列构成的一维光子晶体布拉格微腔的透射谱和缺陷模性质,并将传输矩阵各矩阵元在中心频率附近采用泰勒展开并取一级近似,得到了中心频率附近缺陷模的透射率公式和品质因子公式。研究结果表明:一级近似法能很好地解释由于缺陷层厚度变化而引起的中心频率附近缺陷模频率变化的规律,缺陷模品质因子公式与数值计算结果十分吻合;处于中心频率处的缺陷模具有较高的品质因子,增大缺陷层厚度和布拉格镜周期数可提高缺陷模的品质因子。更多还原

【Abstract】 The transmission spectra and defect mode properties of the one-dimensional(1D) photonic crystal with Bragg microcavity are studied,where the Bragg reflectors are composed of alternately arranged different dielectrics with positive and negative indices.The transfer matrix is expanded in Taylor series near the central frequency,and the formulae of transmission and the quality factor are obtained with the first order approximation.Frequency variance of the defect mode near the central frequency caused by change of the thickness of defect layer material(DLM) can be well explained with the method of the first order approximation.The formula of the quality factor is almost identical with the result of numerical calculation.The quality factor at the central frequency is higher,and increasing defect layer thickness and the number of period can enhance the quality factor of the defect mode.更多还原