含金属层一维三元光子晶体结构的高吸收特性研究

利用传输矩阵理论,分析了含金属层的一维光子 晶体对太阳光谱的吸收特性。通过对一维光子晶体透射谱、 反射谱和吸收谱的分析,分别研究了金属层的消光系数、色散系数、入射角和光子晶体结构 的周期数目变化对吸收率的 影响。结果表明随着消光系数和周期数的增加,吸收率都明显增加,谱线宽度和高吸收带位 置基本保持不变；吸收率随 着色散系数的增加变化规律略有不同,不同吸收带的频谱位置向长波方向移动,谱宽基本保 持不变；吸收率均值随入射 角的增加而减小,而且频谱位置向长波方向移动；一维光子晶体结构周期数增加,各吸收 带的吸收率波动程度减小。 本文结果可用于提高对太阳光辐射的吸收,为光子晶体的设计及其在太阳能利用方面的应用 提供重要依据。

Research on the high absorption property of one dimensional ternary photonic cr ystals with metal layer

Using the transmission matrix method,the absorption characteristics o f one-dimensional photonic crystals with metal layers are studied in this paper.By analyzing the transmission spectrum,reflec tion spectrum and absorption spectrum of the one-dimensional photonic crystals,the effects of metal layers extinct ion coefficient,the dispersion coefficient,the incident angle and the periodic number of the photonic crystal structure on absorptivity are studied.The results show that with the increase of extinction coefficient and the period number,the absorptivity increases obv iously,while the spectral line width and the wavelength position of the high absorption band are basically unchanged.The absorptivity v aries slightly with the increase of the metal layers dispersion coefficient,and the positions of different absorption bands move to the long wave direction,while the spectral width remains unchanged.The average absorptivity decreases with the in crease of incident angle,and the spectral position moves towards the long wave.The absorptivity fluctuation in the whole absorption rate band decreases as the period number of one-dimensional photonic crystal increases.The results of this paper can be used to increase the absorption of solar radiation and provide importantbasis for thedesign ofphotoniccrystals and theira pplication in solar energy utilization.