Abstract

Combined optical studies of a cholesteric photonic crystal are performed: the transmission spectra and the rotation of the plane of polarization of light (RPPL) spectra of the crystal are recorded, and the polarization characteristics of the light having passed through the photonic crystal are measured. The RPPL spectra have specific features related to the presence of a photonic quasi-band gap. The photonic density of states and its transformation with the photonic crystal temperature and thickness are determined. The ellipticity (ratio of the minor to the major axis of ellipse) of the light having passed through the sample is maximal at the center of the band gap and decreases when the distance from the band gap increases. At the center of the photonic quasi-band gap, the ellipticity increases with increasing photonic crystal thickness L and decreasing temperature, and it is close to a circular one in samples with L > 5 μm. The results obtained are compared with the existing theories, the analytical expressions derived from the Maxwell equations, and the results of numerical calculations performed by the 4 × 4 Berreman matrix method

中文翻译：

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穿过胆甾型光子晶体的光的光谱和偏振特性

摘要

进行了胆甾型光子晶体的组合光学研究：记录了晶体的透射光谱和光的偏振面（RPPL）光谱的旋转，并测量了穿过光子晶体的光的偏振特性。RPPL光谱具有与光子准带隙的存在相关的特定特征。确定了状态的光子密度及其随光子晶体温度和厚度的变化。穿过样品的光的椭圆率（椭圆的短轴与椭圆长轴的比）在带隙的中心处最大，并且当距带隙的距离增加时减小。在光子准带隙的中心，椭圆率随光子晶体厚度的增加而增加L且温度降低，并且在L > 5μm的样品中接近圆形。将所得结果与现有理论进行比较，从麦克斯韦方程式导出解析表达式，并通过4×4 Berreman矩阵法进行数值计算