论文标题

PT对称性手性超材料:不对称效应和PT相控制

PT-symmetric chiral metamaterials: Asymmetric effects and PT-phase control

论文作者

Katsantonis, Ioannis, Droulias, Sotiris, Soukoulis, Costas M., Economou, Eleftherios N., Kafesaki, Maria

论文摘要

我们研究了手性对PT-对称性手性系统的PT对称和PT折叠阶段的影响。从横向磁性(TM)和横向电(TE)波的特殊点开始,我们表明,使用圆形极化波(这是TM和TE波的线性组合)混合PT-对称阶段,可以实现这些阶段的程度,并且这些阶段的程度可以通过手术和截然角度来高度控制。此外,尽管非手续PT-Ammortric Systems中TM和TE波的传播对于前向和向后传播是相同的,但我们表明,使用手性,这种对称性可能会破裂。结果,有可能在传播波的极化状态下实现不对称,即侧依赖性,旋转和椭圆度。我们的结果构成了手性PT对称光学系统的一个简单示例,其中各个阶段(完整的PT,混合,破损)可以通过调整手性参数和/或入射角来轻松调节不对称效应。

We investigate the influence of chirality on the PT-symmetric and PT-broken phase of PT-symmetric chiral systems. Starting from the point that transverse magnetic (TM) and transverse electric (TE) waves have different exceptional points, we show that with circularly polarized waves (which are linear combinations of TM and TE waves) mixed PT-symmetric phases can be realized and the extent of these phases can be highly controlled by either or both the chirality and the angle of incidence. Additionally, while the transmission of both TM and TE waves in non-chiral PT-symmetric systems is the same for forward and backward propagation, we show that with chirality this symmetry can be broken. As a result, it is possible to realize asymmetric, i.e. side-dependent, rotation and ellipticity in the polarization state of the transmitted wave. Our results constitute a simple example of a chiral PT-symmetric optical system in which the various phases (full PT, mixed, broken) and the asymmetric effects can be easily tuned by adjusting the chirality parameter and/or the angle of incidence.

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