Broadband polygonal invisibility cloak for visible light.

Broadband polygonal invisibility cloak for visible light.
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可见光的宽带多边形隐形斗篷。

DOI:
10.1038/srep00255
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发表时间:
2012
期刊:
影响因子:
4.6
通讯作者:
Zheng, Bin
Zheng, Bin
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Chen, Hongsheng;Zheng, Bin

文献摘要

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由于变换光学和共形映射的理论工作,隐形斗篷最近成为人们广泛关注的话题。斗篷的设计涉及材料属性的极值和空间相关的参数张量,这是非常难以实现的。在可见光下实现孤立的隐形斗篷是实现完全可移动隐形斗篷的重要一步,但仍然难以实现。在这里,我们报告了可见光隔离多边形斗篷的设计和实验演示。斗篷由多个单元组成,其电磁参数通过线性齐次变换方法设计。理论分析表明,所提出的斗篷可以使从所有方向入射的光线不可见。利用天然各向异性材料,制作了一种适用于六个入射方向的简化六边形斗篷,用于实验演示。该性能在宽带可见光谱中得到验证。
Invisibility cloaks have recently become a topic of considerable interest thanks to the theoretical works of transformation optics and conformal mapping. The design of the cloak involves extreme values of material properties and spatially dependent parameter tensors, which are very difficult to implement. The realization of an isolated invisibility cloak in the visible light, which is an important step towards achieving a fully movable invisibility cloak, has remained elusive. Here, we report the design and experimental demonstration of an isolated polygonal cloak for visible light. The cloak is made of several elements, whose electromagnetic parameters are designed by a linear homogeneous transformation method. Theoretical analysis shows the proposed cloak can be rendered invisible to the rays incident from all the directions. Using natural anisotropic materials, a simplified hexagonal cloak which works for six incident directions is fabricated for experimental demonstration. The performance is validated in a broadband visible spectrum.
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