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首页> 外文期刊>Journal of optics, A. Pure and applied optics: journal of the European Optical Society >Giant optical activity in dielectric planar metamaterials with two-dimensional chirality
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Giant optical activity in dielectric planar metamaterials with two-dimensional chirality

机译：具有二维手性的介电平面超材料中的巨光学活性

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摘要

For the first time, all-dielectric planar chiral metamaterials consisting of arrays of silicon nitride gammadions on fused silica substrates have been fabricated, and shown to be capable of inducing large changes to the polarization states of transmitted light in a manner that is dependent on the two-dimensional chirality of the microstructured silicon nitride film. The polarization response is found to reverse for opposite enantiomers, and also for the same enantiomer when it is illuminated from opposite sides of the structure. In addition, the polarization states of the various diffracted beams are found to be non-reversible. These structures therefore appear to display elements of non-reciprocal behaviour. The polarization responses of complementary designs, different chiral geometries and various silicon nitride film thicknesses have also been studied. As a result we conclude that multiple reflections within the patterned silicon nitride layer play an important role in defining the mechanism by which these structures are able to modify the polarization states of diffracted light.
机译：首次制造了全电介质平面手性超材料，该材料由熔融石英基片上的氮化硅氨基甲酸酯的阵列组成，并显示出能够以依赖于纳米线的方式引起透射光偏振态的大变化。微结构氮化硅膜的二维手性。当从结构的相反侧照亮时，发现相反的对映异构体的偏振响应相反，并且相同的对映异构体的偏振响应也相反。另外，发现各种衍射光束的偏振状态是不可逆的。因此，这些结构似乎显示出不可逆行为的要素。还研究了互补设计，不同的手性几何形状和各种氮化硅膜厚度的偏振响应。结果，我们得出结论，图案化的氮化硅层内的多次反射在定义这些结构能够修改衍射光的偏振态的机制中起着重要作用。

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