Filonov Dmitry S, Shalin Alexander S, Iorsh Ivan, Belov Pavel A, Ginzburg Pavel
J Opt Soc Am A Opt Image Sci Vis. 2016 Oct 1;33(10):1910-1916. doi: 10.1364/JOSAA.33.001910.
Manipulation of radiation is required for enabling a span of electromagnetic applications. Since properties of antennas and scatterers are very sensitive to the surrounding environment, macroscopic artificially created materials are good candidates for shaping their characteristics. In particular, metamaterials enable controlling both dispersion and density of electromagnetic states, available for scattering from an object. As a result, properly designed electromagnetic environments could govern wave phenomena and tailor various characteristics. Here electromagnetic properties of scattering dipoles, situated inside a wire medium (metamaterial), are analyzed both numerically and experimentally. The effect of the metamaterial geometry, dipole arrangement inside the medium, and frequency of the incident radiation on the scattering phenomena is studied in detail. It is shown that the resonance of the dipole hybridizes with Fabry-Perot modes of the metamaterial, giving rise to a complete reshaping of electromagnetic properties. Regimes of controlled scattering suppression and super-scattering are experimentally observed. Numerical analysis is in agreement with the experiment, performed at the GHz spectral range. The reported approach to scattering control with metamaterials could be directly mapped into optical and infrared spectral ranges by employing scalability properties of Maxwell's equations.
为实现一系列电磁应用，需要对辐射进行操控。由于天线和散射体的特性对周围环境非常敏感，宏观人工制造的材料是塑造其特性的理想选择。特别是，超材料能够控制电磁态的色散和密度，这些电磁态可用于从物体散射。因此，经过适当设计的电磁环境可以控制波现象并调整各种特性。本文对位于线介质（超材料）内部的散射偶极子的电磁特性进行了数值和实验分析。详细研究了超材料几何形状、介质内部偶极子排列以及入射辐射频率对散射现象的影响。结果表明，偶极子的共振与超材料的法布里-珀罗模式相互作用，导致电磁特性的完全重塑。实验观察到了可控散射抑制和超散射状态。数值分析与在GHz光谱范围内进行的实验结果一致。通过利用麦克斯韦方程组的可扩展性，本文报道的利用超材料进行散射控制的方法可以直接应用于光学和红外光谱范围。
