Tichit Paul-Henri, Burokur Shah Nawaz, de Lustrac André
IEF, Univ. Paris-Sud, CNRS, UMR 8622, 91405 Orsay Cedex, France.
Opt Express. 2011 Oct 10;19(21):20551-6. doi: 10.1364/OE.19.020551.
Using the idea of wave manipulation via transformation optics, we propose a way to create a quasi-perfect isotropic emission from a directional one. The manipulation is enabled by composite metamaterials that correspond to a space stretching around the source. It is shown that the directive radiation of a plane source larger than the operating wavelength can be transformed into an isotropic one by modifying the electromagnetic properties of the space around it. A set of parameters allowing practical realization of the proposed device is defined. Numerical simulations using Finite Element Method (FEM) are performed to illustrate the proposed coordinate transformation. This idea, which consists in strongly reducing the apparent size of a radiating source, can find various applications in novel antenna design techniques.
利用变换光学中的波操控思想，我们提出了一种将定向发射转换为准完美各向同性发射的方法。这种操控通过与源周围空间拉伸相对应的复合超材料来实现。结果表明，通过改变平面源周围空间的电磁特性，大于工作波长的平面源的定向辐射可以转换为各向同性辐射。定义了一组允许实际实现所提出装置的参数。使用有限元方法（FEM）进行了数值模拟，以说明所提出的坐标变换。这种大幅减小辐射源表观尺寸的思想可在新型天线设计技术中找到各种应用。
