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arXiv 1503.00490physics.optics
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一维手征性:ε-近零超材料中的强旋光性

One-dimensional chirality: strong optical activity in epsilon-near-zero metamaterials

Carlo Rizza, Andrea Di Falco, Michael Scalora, Alessandro Ciattoni

摘要:

我们认为,电磁手征,通常显示的三维或二维复杂的手征结构,可以发生在一维图案的复合材料,其组件是非手性。该特征在几何非手性的1D系统中是非常出乎意料的,因为其镜像总是可以通过180度旋转叠加到其上。我们从第一性原理分析评估多层超材料的双各向异性响应,我们表明,手征张量是不消失的,如果系统是几何一维手征,即它的镜像不能叠加到它上,通过使用平移而不诉诸旋转。作为一维手性的签名,我们表明,一维手性超材料支持光学活性,我们证明了这种现象经历了一个戏剧性的非共振增强ε-近零制度的磁电耦合可以成为主导的本构关系。

英文摘要:

We suggest that electromagnetic chirality, generally displayed by 3D or 2D complex chiral structures, can occur in 1D patterned composites whose components are achiral. This feature is highly unexpected in a 1D system which is geometrically achiral since its mirror image can always be superposed onto it by a 180 deg rotation. We analytically evaluate from first principles the bi-anisotropic response of multilayered metamaterials and we show that the chiral tensor is not vanishing if the system is geometrically one-dimensional chiral, i.e. its mirror image can not be superposed onto it by using translations without resorting to rotations. As a signature of 1D chirality, we show that 1D chiral metamaterials support optical activity and we prove that this phenomenon undergoes a dramatic non-resonant enhancement in the epsilon-near-zero regime where the magneto-electric coupling can become dominant in the constitutive relations.

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