Iwaszczuk Krzysztof, Strikwerda Andrew C, Fan Kebin, Zhang Xin, Averitt Richard D, Jepsen Peter Uhd
DTU Fotonik—Department of Photonics Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.
Opt Express. 2012 Jan 2;20(1):635-43. doi: 10.1364/OE.20.000635.
We have wrapped metallic cylinders with strongly absorbing metamaterials. These resonant structures, which are patterned on flexible substrates, smoothly coat the cylinder and give it an electromagnetic response designed to minimize its radar cross section. We compare the normal-incidence, small-beam reflection coefficient with the measurement of the far-field bistatic radar cross section of the sample, using a quasi-planar THz wave with a beam diameter significantly larger than the sample dimensions. In this geometry we demonstrate a near-400-fold reduction of the radar cross section at the design frequency of 0.87 THz. In addition we discuss the effect of finite sample dimensions and the spatial dependence of the reflection spectrum of the metamaterial.
我们用强吸收性超材料包裹了金属圆柱体。这些共振结构是在柔性基板上制作的，能平滑地覆盖圆柱体，并赋予其电磁响应，旨在使其雷达散射截面最小化。我们使用束径明显大于样品尺寸的准平面太赫兹波，将垂直入射的小束反射系数与样品的远场双基地雷达散射截面测量值进行比较。在这种几何结构中，我们证明了在0.87太赫兹的设计频率下，雷达散射截面降低了近400倍。此外，我们还讨论了有限样品尺寸的影响以及超材料反射光谱的空间依赖性。
