论文标题
PT对称性手性超材料的散射特性
Scattering properties of PT-symmetric chiral metamaterials
论文作者
论文摘要
尊重平价时间(PT)对称的光学系统中增益和损失的结合最近指出了各种新型的光学现象和可能性。可以通过将PT对称概念与超材料相结合来实现其中的许多。在这里,我们研究了手性超材料的情况,表明手性超材料与PT对称增益损失的组合可以使各种现象和功能都非常丰富。在检查一个简单的一维手性PT对称系统时,我们表明,正常入射的波浪将PT对称性和与手性相关的特征几乎可以独立调整,并且几乎可以随意地叠加。另一方面,在倾斜的发生率下,手性会影响所有与PT相关的特征,这也导致了新颖和不常见的波传播特征,例如不对称的传播和不对称的光学活性和椭圆度。所有这些特征都是通过手性和入射角高度控制的,这使得PT-对称性手性超材料在各种偏振控制的应用程序中都有价值。
The combination of gain and loss in optical systems that respect parity-time (PT)-symmetry has pointed recently to a variety of novel optical phenomena and possibilities. Many of them can be realized by combining the PT-symmetry concepts with metamaterials. Here we investigate the case of chiral metamaterials, showing that combination of chiral metamaterials with PT-symmetric gain-loss enables a very rich variety of phenomena and functionalities. Examining a simple one-dimensional chiral PT-symmetric system, we show that with normally incident waves the PT-symmetric and the chirality-related characteristics can be tuned independently and superimposed almost at will. On the other hand, under oblique incidence, chirality affects all the PT-related characteristics, leading also to novel and uncommon wave propagation features, such as asymmetric transmission and asymmetric optical activity and ellipticity. All these features are highly controllable both by chirality and by the angle of incidence, making PT-symmetric chiral metamaterials valuable in a large range of polarization-control-seeking applications.