标题： 手性区分通过金属球的偏振奇点 显示英文标题

标题： Chiral discrimination by polarization singularities of a metal sphere

摘要： 手性区分的实际应用通常受到对映体的弱手性响应和检测方法的高复杂性的限制。 在这里，我们提出利用金属球光散射中出现的C线（即偏振奇点线）来检测小的手性粒子。 通过全波数值模拟和解析多极展开，我们确定了深亚波长螺旋（即手性粒子）在C线上不同位置的吸收不对称性。 我们发现，吸收不对称性可以比由圆偏振平面波激发引起的吸收不对称性大得多，这可以归因于感应电偶极子和磁偶极子的不对称吸收。 我们还表明，吸收不对称性强烈依赖于螺旋的各向异性。 这些结果可能在光学操控、光学传感和手性量子光学中找到应用。 显示英文摘要

摘要： The practical applications of chiral discrimination are usually limited by the weak chiral response of enantiomers and the high complexity of detection methods. Here, we propose to use the C lines (i.e., lines of polarization singularities) emerged in light scattering by a metal sphere to detect small chiral particles. Using full-wave numerical simulations and analytical multipole expansions, we determined the absorption dissymmetry of deep-subwavelength helices (i.e., chiral particles) at different positions on the C lines. We find that the absorption dissymmetry can be much larger than that induced by circularly polarized plane wave excitation, and it can be attributed to the asymmetric absorption of the induced electric and magnetic dipoles. We also show that the absorption dissymmetry strongly depends on the anisotropy of the helices. The results may find applications in optical manipulations, optical sensing, and chiral quantum optics.