具有复介电常量对称结构一维三元光子晶体透射谱的研究

On Transmission Spectrum of Symmetrical 1D Three Sects Photonic Crystal with Complex Dielectric Constant

利用传输矩阵法理论,研究含复介电常量对称结构一维三元光子晶体的光传输特性。结果表明:当各层介质的介电常量均为实数时,在较宽的禁带范围内出现一条透射率为100%的透射峰;当介质介电常量含正虚部时,禁带中的透射峰出现透射衰减现象,若含有负虚部时,透射峰则出现透射增益现象;随着复介电正虚部的增大,透射峰出现单调衰减,而随着复介电负虚部绝对值的增大,透射增益达到一极大值,随后减小;在不同介质层引入复介电常量引起透射峰的透射率衰减或增益强度不同。这些特性对设计光放大器、衰减器等新型光学器件有一定的参考价值。

Optical transmission properties of one-dimensional three Sects photonic crystals are studied by using transfer matrix method.The results show that when the dielectrics are real constant,the transmission peak with transmission rate of 100% appears in the main band;when the dielectric is complex constant and the complex has a positive imaginary part,transmission rate decay appears in the main band.On the contrary,when imaginary part of dielectric is a negative,the peak transmission rate appears gain.The transmission rate decays monotonously with the increasing size of absolute positive imaginary part.However,there is a maximum transmission gain and a maximum value with the increasing size of absolute positive imaginary part,and then transmittance gain decays rapidly.In addition,when the complex dielectric is introduced to the different dielectric layers,the transmission rate has different decay or gain intensity.These features have some reference values for the design of new optical devices such as the optical amplifier and attenuator.