介质光学厚度对光子晶体透射谱特性的调制

摘要

利用传输矩阵法理论，研究介质光学厚度对一维光子晶体（AB）5（BA）5透射谱特性的影响，结果表明：只要A、B介质光学厚度满足DA＝DB ，随着介质光学厚度的增大，光子晶体透射峰的透射率、频率位置和带宽均保持不变；当A、B介质的光学厚度不相等即DA≠DB 时，随着DA或DB ，或DA、DB的增大，禁带中透射峰的透射率不变但带宽变宽，且当DA ＞DB 时透射峰向高频方向移动，反之则向低频方向移动。介质光学厚度对光子晶体透射谱的调制规律，可为光子晶体模型的构建、窄带光学滤波器和光学开关的设计等提供有益参考。%The modulation of optical thickness on transmission spectrum of one-dimensional photonic crystal was stud-ied by using transfer matrix theory.The results show that the transmittance,frequency and bandwidth of transmission peak are not changed with increasing the optical thickness of medium when the optical thickness of A and B medium are equivalent (DA=DB );when the optical thickness DA and DB are not equivalent (DA≠DB ),with increasing DA or DB or DA and DB ,the transmittance of transmission peak is not changed,but the bandwidth is widen,and when DA >DB ,the transmission peak shifts to higher frequency,on the contrary,the transmission peak shifts to the lower frequen-cy.These laws of modulation can provide a useful reference for construction of the photon crystal model and design of narrow band optical filter and optical switch.