【摘要】 基于一维光子晶体超晶格理论及耦合腔理论,提出了一种具有多个平顶透射峰的超晶格结构.把传统单一材料的耦合腔换成有限周期的光子晶体结构,形成一种超晶格结构.通过使插入的光子晶体的光场有效耦合,能够产生多个平顶透射峰.运用传输矩阵法,研究了该结构的光谱特性以及结构和材料参量对透射峰的位置和半峰全宽的影响.计算结果表明,该结构具有较宽的带隙,并且多个平顶透射峰对称分布,透射率高,误差容忍度好.详细讨论了透射峰确切位置的计算方法,并给出了严格的解析表达式.更多还原

【Abstract】 Based on the principle of one-dimensional photonic crystal super-lattice and coupled optical microcavities,a new scheme to achieve multiple channeled optical filters with flat-top transmission peaks was presented.The traditional cavities of single material were replaced by photonic crystals with finite period,and thus a super-lattice structure was constructed.Using transfer-matrix method,the structural spectra and the influence of the structural and material parameters on the locations and the FWHMs of the transmission peaks were studied.The numerical results show that this structure has a rather wide photonic band gap,in which there are multiple flat-top transmission peaks.These peaks are symmetrical,with high transmission rate and high error tolerance.The locations of these peaks can be calculated exactly,and the strict analytic expression was presented.更多还原