Gutsche Philipp, Nieto-Vesperinas Manuel
Freie Universität Berlin, Mathematics Institute, 14195 Berlin, Germany.
Zuse Institute Berlin, Computational Nano Optics, 14195 Berlin, Germany.
Sci Rep. 2018 Jun 20;8(1):9416. doi: 10.1038/s41598-018-27496-w.
We derive expressions for the scattering, extinction and conversion of the chirality of monochromatic light scattered by bodies which are characterized by a T-matrix. In analogy to the conditions obtained from the conservation of energy, these quantities enable the classification of arbitrary scattering objects due to their full, i.e. either chiral or achiral, electromagnetic response. To this end, we put forward and determine the concepts of duality and breaking of duality symmetry, anti-duality, helicity variation, helicity annhiliation and the breaking of helicity annihilation. Different classes, such as chiral and dual scatterers, are illustrated in this analysis with model examples of spherical and non-spherical shape. As for spheres, these concepts are analysed by considering non-Rayleigh dipolar dielectric particles of high refractive index, which, having a strong magnetic response to the incident wavefield, offer an excellent laboratory to test and interpret such changes in the chirality of the illumination. In addition, comparisons with existing experimental data are made.
我们推导了由以T矩阵为特征的物体散射的单色光的散射、消光和手性转换的表达式。类似于从能量守恒得到的条件，这些量能够根据任意散射物体的完整电磁响应（即手性或非手性）对其进行分类。为此，我们提出并确定了对偶性和对偶对称性破缺、反对偶性、螺旋度变化、螺旋度湮灭以及螺旋度湮灭破缺的概念。在该分析中，用球形和非球形的模型示例说明了不同的类别，如手性和对偶散射体。对于球体，通过考虑具有高折射率的非瑞利偶极介电粒子来分析这些概念，这些粒子对入射波场具有强烈的磁响应，为测试和解释照明手性的这种变化提供了一个极好的实验平台。此外，还与现有的实验数据进行了比较。
