da Silva R R, Zanetti F M, de Oliveira I N
Instituto de Física, Universidade Federal de Alagoas 57072-970 Maceió-AL, Brazil.
Universidade Federal de Alagoas, Campus Arapiraca, 57309-005 Arapiraca-AL, Brazil.
Phys Rev E Stat Nonlin Soft Matter Phys. 2014 Jan;89(1):012508. doi: 10.1103/PhysRevE.89.012508. Epub 2014 Jan 28.
The present work is devoted to the study of spectral characteristics of normal incident light transmitted by a multilayered structure composed of an alternated sequence of nematic and magnetic layers presenting a central magneto-optical defect. Using the Berreman 4 × 4 matrix formalism, we numerically obtain the transmission spectrum and the polarization rotation angle of the system as a function of the nematic optical axis direction. Our results reveal the emergence of a shift between the wavelengths of the resonant mode and polarization rotation angle, which strongly depends on the birefringence of the nematic layers. In particular, we show the existence of distinct regimes for the wavelength mismatch between the transmission of resonant modes and the maximum polarization rotation angle, which are governed by the ordinary and extraordinary refractive indices of nematic layers. The mechanism behind such shift is discussed under the light of propagation eigenmodes for a medium presenting circular and linear birefringence. The effects associated with the defect thickness are also analyzed.
本工作致力于研究由向列层和磁性层交替序列组成的多层结构所透射的垂直入射光的光谱特性，该多层结构存在一个中心磁光缺陷。利用贝里曼4×4矩阵形式，我们数值计算了系统的透射光谱和偏振旋转角随向列光轴方向的变化。我们的结果揭示了共振模波长与偏振旋转角之间出现了偏移，这强烈依赖于向列层的双折射。特别地，我们展示了共振模透射与最大偏振旋转角之间波长失配的不同区域的存在，这些区域由向列层的寻常和非寻常折射率决定。根据呈现圆双折射和线双折射的介质的传播本征模，讨论了这种偏移背后的机制。还分析了与缺陷厚度相关的影响。
