Homogeneous optical cloak constructed with uniform layered structures
Homogeneous optical cloak constructed with uniform layered structures
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DOI：
10.1364/oe.19.008625
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发表时间：
2011-04-25
期刊：
影响因子：
3.8
通讯作者：
Mortensen, Niels Asger
中科院分区：
文献类型：
--
作者：
Zhang, Jingjing;Liu, Liu;Mortensen, Niels Asger
几个世纪以来，让物体看不见的前景一直吸引着研究人员。基于变换光学的隐身斗篷设计正在将这一目标从科幻小说变为现实，并已在微波和光学频率上进行了实验演示。然而，到目前为止报道的大多数隐形斗篷都具有空间变化的折射率，这需要复杂的设计过程。此外，隐藏对象的大小通常比隐形设备的大小小。本文报道了一种具有均匀硅栅结构的均匀隐身斗篷的实验实现。该设计策略消除了材料折射率空间变化的需要，在尺寸方面允许非常大的障碍物/斗篷比。已在近红外频率验证了宽带隐身行为，为使用均匀分层介质在任何频率范围实现隐身开辟了新的机会，在任何频率范围内都可以获得高质量的电介质。(C)2011年美国光学学会
The prospect of rendering objects invisible has intrigued researchers for centuries. Transformation optics based invisibility cloak design is now bringing this goal from science fictions to reality and has already been demonstrated experimentally in microwave and optical frequencies. However, the majority of the invisibility cloaks reported so far have a spatially varying refractive index which requires complicated design processes. Besides, the size of the hidden object is usually small relative to that of the cloak device. Here we report the experimental realization of a homogenous invisibility cloak with a uniform silicon grating structure. The design strategy eliminates the need for spatial variation of the material index, and in terms of size it allows for a very large obstacle/cloak ratio. A broadband invisibility behavior has been verified at near-infrared frequencies, opening up new opportunities for using uniform layered medium to realize invisibility at any frequency ranges, where high-quality dielectrics are available. (C)2011 Optical Society of America