强人工光学手征材料的因果关系
Causality relations for materials with strong artificial optical chirality
摘要：
我们表明，基本的因果关系原理被应用到强手性人工材料产生的广义Kramers-Kronig关系的观测值-圆二色性和旋光性。这些关系包括由材料特定特征确定的Blaschke项-复频率平面上的传输振幅的零点。通过银膜中手征空穴的亚波长阵列的例子，我们表明，因果关系不仅可以用于实验数据的精确验证，而且可以用于解决材料异常和共振的位置和量化的手征分裂的程度。
英文摘要：
We demonstrate that the fundamental causality principle being applied to strongly chiral artificial materials yields the generalized Kramers-Kronig relations for the observables -- circular dichroism and optical activity. The relations include the Blaschke terms determined by material-specific features - the zeros of transmission amplitude on the complex frequency plane. By the example of subwavelength arrays of chiral holes in silver films we show that the causality relations can be used not only for a precise verification of experimental data but also for resolving the positions of material anomalies and resonances and quantifying the degree of their chiral splitting.
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