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arXiv 1905.04439physics.app-phphysics.optics
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利用手征梯度元表面实现电磁波阵面的同时完美弯曲和极化旋转

Simultaneous Perfect Bending and Polarization Rotation of Electromagnetic Wavefront using Chiral Gradient Metasurfaces

Hamidreza Kazemi, Mohammad Albooyeh, Filippo Capolino

摘要:

我们引入手征梯度超颖表面,允许所有的入射波完美的传输到一个所需的方向和同时完美的旋转的偏振的折射波相对于入射。除了使用提供折射波相对于入射波的弯曲的梯度偏振密度之外,使用手性的超颖表面内含物允许折射波的偏振旋转。我们提出了一种可能的实现所提出的设备通过离散化所需的等效表面极化密度实现适当的螺旋夹杂物在每个离散点。通过仅使用单个光学薄层的手性夹杂物,我们能够以$72\%$功率效率在$45^{\circ}$处将法向入射平面波偏转为折射平面波,所述$72\%$功率效率伴随有$90^{\circ}$偏振旋转。所提出的概念和设计方法可以在微波偏振旋转器件以及光学中找到实际应用,特别是当入射功率需要偏转时。

英文摘要:

We introduce chiral gradient metasurfaces that allow perfect transmission of all the incident wave into a desired direction and simultaneous perfect rotation of the polarization of the refracted wave with respect to the incident one. Besides using gradient polarization densities which provide bending of the refracted wave with respect to the incident one, using metasurface inclusions that are chiral allows the polarization of the refracted wave to be rotated. We suggest a possible realization of the proposed device by discretizing the required equivalent surface polarization densities realized by proper helical inclusions at each discretization point. By only using a single optically thin layer of chiral inclusions, we are able to unprecedentedly deflect a normal incident plane wave to a refracted plane wave at $45^{\circ}$ with $72\%$ power efficiency which is accompanied by a $90^{\circ}$ polarization rotation. The proposed concepts and design method may find practical applications in polarization rotation devices at microwaves as well as in optics, especially when the incident power is required to be deflected.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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