Activation effect of complex defects with two ends symmetry on transmission properties of photonic crystals
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摘要: 为研究和设计高品质、高性能的光学滤波、光学放大、光学衰减和全反射镜等器件,通过计算模拟的方式,研究两端对称复缺陷对光子晶体C(AB)n(BAB)(BA)nC光传输特性的激活效应,研究表明:在对称结构光子晶体的两端置入缺陷C,当缺陷C为实介质时,光子晶体透射谱中出现多条透射率为100%的分立透射峰。当C中掺入具有增益放大效应的杂质形成含负虚部的复折射率缺陷时,透射谱中各分立透射峰的透射率均出现增益放大现象,而且缺陷层复折射率的虚部或实部对透射峰的增益放大倍数均具有调制作用,随着缺陷层复折射率的负虚部或实部增大,透射增益放大倍数先增大,达到极大值后再减小,增益放大倍数最高达可达104数量级。当C中掺入具有衰减效应的杂质形成含正虚部的复折射率缺陷时,透射谱中各分立透射峰均出现透射率衰减现象,而且缺陷层复折射率的虚部或实部对透射峰的衰减倍数也具有调制作用,随着缺陷层复折射率的正虚部增大,各分立透射峰的透射率不断衰减,直至透射率趋于零,出现全反射或全吸收现象。两端对称复缺陷对光子晶体光传输特性的调制规律,可为新型光学器件的研究与设计提供理论参考。Abstract: In order to research and design high performance optical filters, optical amplifiers, optical attenuators and total reflection mirrors, activation effect of complex defects with two ends symmetry on the optical propagation properties of photonic crystal C(AB)n(BAB)(BA)nC has been studied by computer simulation. The results show that, when C is real medium defect, there are several discrete transmission peaks with 100% transmittance in the transmission spectrum of photonic crystal with symmetrical structure. When the impurity with gain amplification effect is doped into C to form complex refractive index defect with negative imaginary part, transmittance of each discrete transmission peak in the transmission spectrum will have an amplified gain. Both the imaginary part and the real part of the complex refractive index of the defect layer can modulate the gain amplification of the transmission peak. With the increase of the negative imaginary part or real part of the complex refractive index of the defect layer, the transmission gain magnification increases first, reaches the maximum value and then decreases, and the gain magnification can reach up to 104 orders of magnitude. When the impurity with gain amplification effect is doped into C to form complex refractive index defect with positive imaginary part, transmittance of each discrete transmission peak in the transmission spectrum will have attenuation phenomenon. Both the imaginary part and the real part of the complex refractive index of the defect layer can modulate the attenuation multiple of the transmission peak. With the increase of the positive imaginary part of the complex refractive index of the defect layer, the transmittance of the discrete transmission peaks decreases until the transmittance tends to zero, and total reflection or total absorption occurs. The modulation law of symmetrical complex defects at both ends on the transmission characteristics of photonic crystals can provide theoretical reference for the research and design of new optical amplifiers, filters, attenuators and total reflection mirrors.
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Key words:
- photonic crystal /
- complex defects with two ends /
- filtering /
- gain amplification /
- modulation
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