All-angle negative refraction and imaging in a bulk medium made of metallic nanowires in the visible region
All-angle negative refraction and imaging in a bulk medium made of metallic nanowires in the visible region
复制标题
DOI：
10.1364/oe.16.015439
复制
发表时间：
2008-09-29
期刊：
影响因子：
3.8
通讯作者：
Zhang, Xiang
中科院分区：
文献类型：
--
作者：
Liu, Yongmin;Bartal, Guy;Zhang, Xiang
我们从理论上证明了全角度负折射和成像可以通过金属纳米线嵌入在介质矩阵中实现。当纳米线之间的间隔远小于入射波长时，这些结构可以被表征为不确定介质，其垂直于和平行于线的有效折射率在符号上相反。在此条件下，横向磁波在纳米线系统中传播的色散图是双曲线的，从而表现出全角度负折射。这种不确定介质可以在远离任何共振的宽频率范围（可见光到近红外）上工作，因此它们提供了一种有效的方式来操纵光在体相介质中的传播，具有低损耗，从而允许在光子器件中的潜在应用。(C)2008年美国光学学会
We theoretically demonstrated that all-angle negative refraction and imaging can be implemented by metallic nanowires embedded in a dielectric matrix. When the separation between the nanowires is much smaller than the incident wavelength, these structures can be characterized as indefinite media, whose effective permittivities perpendicular and parallel to the wires are opposite in signs. Under this condition, the dispersion diagram is hyperbolic for transverse magnetic waves propagating in the nanowire system, thereby exhibiting all-angle negative refraction. Such indefinite media can operate over a broad frequency range (visible to near-infrared) far from any resonances, thus they offer an effective way to manipulate light propagation in bulk media with low losses, allowing potential applications in photonic devices. (C) 2008 Optical Society of America