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利用传输矩阵法理论,研究含吸收材料对称结构一维三元光子晶体的光传输特性。结果表明:当各层介质无吸收时,在较宽的禁带范围内出现一条透射率为100%的透射峰;当介质的折射率为带有正虚部的复数,即介质存在吸收时,禁带中的透射峰出现明显的透射衰减,且随着复折射率虚实比β的增大透射率出现单调衰减规律;当单个介质存在吸收时,随着各介质折射率虚实比的增大,透射率的衰减速度存在各异,其中以C介质的折射率虚实比βc对透射峰透射率的影响较大,其次为B,A的影响相对较小;当所有介质同时存在吸收时,透射衰减最为明显。这些特性为光学衰减器的设计提供理论指导意义。
The transfer matrix theory is used to study the optical transmission characteristics of one-dimensional three-photonic crystals with symmetrical structure of absorbing material. The results show that when there is no absorption in each layer, a transmission peak with a transmittance of 100% appears in a wide band gap. When the refractive index of a medium is a complex number with a positive imaginary part, that is, the medium is absorbed, The transmission peak in the forbidden band shows obvious transmission attenuation, and the monotonous attenuation of transmittance appears with the increase of the true-solid ratio β of complex refractive index. With the absorption of single medium, with the increase of the real / The rate of decay of transmittance varies. The difference between the true and the true of the refractive index of the medium C and the transmittance of the transmission peak is larger, followed by the influence of B and A is relatively small. When all the media have the absorption, the transmission attenuation The most obvious. These characteristics provide theoretical guidance for the design of optical attenuator.