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Optical activity in metal and dielectric planar chiral gratings

机译:金属和介电平面手性光栅中的光学活性

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When a linearly polarized light wave propagates in a chiral medium, the polarization plane azimuth rotates clockwise or counter-clockwise depending on the handedness of the material. This effect is called optical activity. It can be observed in a number of crystals and organic liquids, however the rotatory power of chiral materials available in nature is useally very small. That is why chiral planar micro- or nano-structures, which possess a much stronger rotatory power than natural chrial media, have attracted a considerable attention in recent years. We demonstrate large optical activity of chiral subwavelength gratings having no in-plane mirror symmetry and fabricated with metal thin films. For zeroth-order transmitted light, the chirality of these gratings manifests itself in the non-coplanarity of the electric field vectors at the air- and substrate-sides of the metal layer and can be interpreted in terms of the surface pllasmon enhanced non-local light-matter interaction. We demonstrate also that in all-dielectric subwavelength chiral gratings, the optical activity can be enhanced even stronger by using waveguide resonance. In the terahertz (THz) region, we obtain rotation of the polarization zunuth of a linearly polarized THz wave by using double-layered metal chiral structure with complimentary patterns.
机译:当线性偏振光波在手性介质中传播时,偏振平面的方位角将根据材料的使用习惯顺时针或逆时针旋转。这种效应称为光学活性。可以在许多晶体和有机液体中观察到它,但是自然界中可用的手性材料的旋转力非常小。这就是为什么手性平面微结构或纳米结构具有比天然chal介质更强的旋转力的特性,近年来引起了相当大的关注。我们展示了手性亚波长光栅的大光学活性,该手性亚波长光栅不具有平面内的镜面对称性,并且由金属薄膜制成。对于零阶透射光,这些光栅的手征性表现为金属层空气侧和衬底侧的电场矢量的非共面性,并且可以用表面等离子体激元增强的非局部性来解释。光与物质的相互作用。我们还证明,在全电介质亚波长手性光栅中,通过使用波导共振可以增强光学活性。在太赫兹(THz)区域中,我们通过使用带有互补图案的双层金属手性结构来获得线性极化THz波的极化zunuth的旋转。

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