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一维光子晶体基本周期的介质折射率取n2=1.5和n3=2.5,采用传输矩阵法,通过For-tran编程进行数值计算,分别得到了不同周期层数(N)及不同入射角度(θ1)下的一维光子晶体透射谱;从光子带隙频宽、带隙中心位置及带隙中心的透射率值等方面,分析并讨论了周期层数及入射角对一维光子晶体带隙特性的影响。结果表明,随着N值的增加,带隙中心的透射率值迅速减小,当N增至16层时,一维光子晶体基本形成;此外,在0°～85°内,随着入射角度的增加,带隙低频值向左移动,高频值向右移动,带隙宽度呈增加的趋势,入射角不影响光子带隙的中心位置。
The refractive index of one-dimensional photonic crystal in the fundamental period is taken as n2 = 1.5 and n3 = 2.5. The transmission matrix method and the For-tran programming are used to calculate the refractive indices of the different layers (N) and different angles of incidence (θ1) The photon band gap, the center of bandgap and the center of bandgap are analyzed and discussed. The effects of periodic layer number and incident angle on the bandgap characteristics of one-dimensional photonic crystal influences. The results show that with the increase of N, the value of the transmissivity in the center of the bandgap rapidly decreases, and one-dimensional photonic crystals are basically formed when N is increased to 16 layers. In addition, with 0 ° ~85 °, with the incident angle The value of band gap moves to the left and the value of high frequency moves to the right, the band gap width shows an increasing trend. The incident angle does not affect the center position of the photonic band gap.