Reyes-Coronado A, Acosta M F, Merino R I, Orera V M, Kenanakis G, Katsarakis N, Kafesaki M, Mavidis Ch, García de Abajo J, Economou E N, Soukoulis C M
Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology-Hellas (FORTH), P.O. Box 1385, 71110 Heraklion, Crete, Greece.
Opt Express. 2012 Jun 18;20(13):14663-82. doi: 10.1364/OE.20.014663.
In this paper we discuss the fabrication and the electromagnetic (EM) characterization of anisotropic eutectic metamaterials, consisting of cylindrical polaritonic LiF rods embedded in either KCl or NaCl polaritonic host. The fabrication was performed using the eutectics directional solidification self-organization approach. For the EM characterization the specular reflectance at far infrared, between 3 THz and 11 THz, was measured and also calculated by numerically solving Maxwell equations, obtaining good agreement between experimental and calculated spectra. Applying an effective medium approach to describe the response of our samples, we predicted a range of frequencies in which most of our systems behave as homogeneous anisotropic media with a hyperbolic dispersion relation, opening thus possibilities for using them in negative refractive index and imaging applications at THz range.
在本文中，我们讨论了各向异性共晶超材料的制备及其电磁（EM）特性，该超材料由嵌入KCl或NaCl极性主体中的圆柱形极化子LiF棒组成。制备过程采用共晶定向凝固自组装方法。对于电磁特性表征，我们测量并通过数值求解麦克斯韦方程组计算了远红外波段（3太赫兹至11太赫兹）的镜面反射率，实验光谱与计算光谱之间取得了良好的一致性。应用有效介质方法来描述我们样品的响应，我们预测了一系列频率范围，在这些频率范围内，我们的大多数系统表现为具有双曲色散关系的均匀各向异性介质，从而为在太赫兹波段的负折射率和成像应用中使用它们开辟了可能性。
