采用传输矩阵法理论,通过模拟仿真的方式,研究不对称度对一维三元对称结构光子晶体(C_mA_mB_m)~n(B_mA_mC_m)~n透射特性的影响,结果表明:当光子晶体处于镜像对称结构(CAB)~n(BAC)~n时,透射谱的禁带中出现的单条透射峰随周期数n增大而变精细,但透射峰的透射率及所处的波长位置不变。当光子晶体对称性受到破坏时,随着周期不对称度Δn增大,透射谱中单透射峰的透射率快速下降,但所处的波长位置不变;随着A、B、C介质层厚度不对称度增大,透射谱中单透射峰的透射率出现不同程度的下降,并向波长方向蓝移。其中A、B、C介质层厚度不对称度同时增大时,透射率下降及蓝移速度最快,A层介质不对称度Δd_A增大时透射率下降速度次之。不对称度对一维三元对称结构光子晶体透射特性的作用机制,为光学滤波、光学开关及全反射器件等的研究和设计提供理论指导。 The effects of asymmetry on the transmission characteristics of one-dimensional three-dimensional symmetric structures (C_mA_mB_m) ~n (B_mA_mC_m) ~n are investigated by using the transfer matrix method. The simulation results show that when the photonic crystals are in the mirror symmetry structure (CAB) ~ n (BAC) ~ n, the single transmission peak appeared in the bandgap of the transmission spectrum becomes finer with the increase of the number of cycles n, but the transmittance and the wavelength of the transmission peak are unchanged. When the symmetry of the photonic crystal is damaged, the transmittance of the single transmission peak in the transmission spectrum drops rapidly with the increase of the periodic asymmetry Δn, but the wavelength position does not change. With the thickness of the A, B, and C dielectric layers Asymmetry increases, the transmission spectrum of single-transmission peak transmittance decreased to varying degrees, and to the blue-shifted wavelength. Where the thickness asymmetry of A, B and C layers increases, the transmittance decreases and the blue-shift speed is the fastest, and the decrease rate of the transmittance decreases when the asymmetry of layer A Δd_A increases. Asymmetry degree on the one-dimensional three-way symmetrical structure of the photonic crystal transmission characteristics of the mechanism for optical filtering, optical switches and total reflection devices such as research and design to provide theoretical guidance.