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采用传输矩阵法对两端对称负折射率缺陷复合光子晶体结构[D(AB)mD]N的透射特性进行了研究。结果表明:当N=2时,该结构透射谱的禁带出现两个完全共振透射峰,当N增加时,每个共振透射峰又分裂为N-1条;当复合光子晶体的层数m逐渐增加时,透射峰的品质因子逐渐提高,且分裂的共振透射峰距离逐渐减少;既为该结构实现高品质的多通道滤波器提供了理论依据,同时也为有效使用禁带提供了基础。当负折射率缺陷层的折射率绝对值增加时,各透射峰向长波方向移动,且缺陷层的折射率与透射峰的波长呈良好的线性关系,可制作所需要的高效多通道光开关。
Transmission matrix method was used to study the transmission characteristics of [D (AB) mD] N complex photonic crystal structure with symmetric negative refractive index defect. The results show that when N = 2, two complete resonance transmission peaks appear in the forbidden band of the transmission spectrum. When N increases, each resonance transmission peak splits into N-1 bands. When the number of layers of the composite photonic crystal m With the gradual increase, the quality factor of the transmission peak gradually increases and the distance between the resonant transmission peaks of the split gradually decreases. This not only provides a theoretical basis for realizing high quality multi-channel filter, but also provides a basis for effectively using the forbidden band. When the absolute value of the refractive index of the negative refractive index defect layer is increased, each of the transmission peaks moves in the direction of the long wavelength, and the refractive index of the defect layer and the wavelength of the transmission peak have a good linear relationship, so that an efficient multi-channel optical switch can be manufactured.