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Enhanced optical activity in hyperbolic metasurfaces

机译：双曲超曲面中增强的光学活性

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摘要

The optical activity of achiral nonmagnetic uniaxial metasurfaces caused by the extrinsic chirality arising from the mutual orientation of their anisotropy axis and the light plane of incidence is studied. The hyperbolic regime of the metasurfaces manifests in the amplification of the polarization rotation in transmitted light and in the giant enhancement of the effect in reflected light. The transition to this regime is frequency dependent and has a topological nature. The key role in the optical activity enhancement belongs to the σ-near-pole and hyperbolic σ-near-zero regimes of the metasurfaces. The hyperbolic metasurfaces based on graphene strips or metal disks, and a black phosphorus thin film as a natural hyperbolic layer are considered. The efficiency of the predicted effects depends on the metasurface implementation and the role of a substrate. By varying the metasurface parameters and choosing the physical realizations it is possible to design such a hyperbolic metasurface polarizer for the THz, infrared, and visible working ranges. Our findings may help to improve metasurface polarizers by using them in the hyperbolic regime.
机译：研究了由非均质性手性各向异性轴和入射光平面的相互取向引起的非手性非磁性单轴超表面的光学活性。超表面的双曲形式表现为透射光中偏振旋转的放大和反射光中效应的极大增强。向这种状态的过渡取决于频率并具有拓扑性质。在光学活性增强中的关键作用是超表面的σ-近极和双曲σ-接近零状态。考虑了基于石墨烯带或金属盘的双曲面超表面以及作为自然双曲线层的黑磷薄膜。预测效果的效率取决于超表面的实现方式和基材的作用。通过改变超表面参数并选择物理实现，可以为THz，红外和可见工作范围设计这种双曲线超表面偏振器。我们的发现可能通过在双曲线体系中使用它们来改善超表面偏振器。

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  • 来源
    《Physical review》 |2017年第23期|235403.1-235403.12|共12页
  • 作者

    O. V. Kotov; Yu. E. Lozovik;

  • 作者单位

    N. L Dukhov Research Institute of Automatics (VNIIA), 127055 Moscow, Russia ,Institute of Microelectronics Technology and High Purity Materials, Russian Academy of Sciences, 142432 Chernogolovka, Russia;

    N. L Dukhov Research Institute of Automatics (VNIIA), 127055 Moscow, Russia ,Institute of Microelectronics Technology and High Purity Materials, Russian Academy of Sciences, 142432 Chernogolovka, Russia ,Institute for Spectroscopy, Russian Academy of Sciences, 142190 Troitsk, Moscow, Russia ,National Research University Higher School of Economics, 101000 Moscow, Russia;

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