Highly anisotropic metal-dielectric structures reveal unique dispersion properties providing new optical effects. Here we study experimentally linear optical and magneto-optical response of arrays of plasmonic gold nanorods and similar structures complemented by a thin nickel film. We show that both types of structures reveal distinct optical features expected for hyperbolic media and associated with the epsilon-near-zero (ENZ) and epsilon-near-pole (ENP) points. In the case of Ni-containing nanocomposites, we observe linear magneto-optical effects in transmission through the structure, increasing in the vicinity of these points. This observation reveals an important role of the local field enhancement in a hyperbolic medium associated with ENZ and ENP dispersion points in the appearance of magneto-optical activity of magnetic hyperbolic metamaterials.

中文翻译：

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双曲超材料中的磁光效应

高度各向异性的金属介电结构具有独特的色散特性，可提供新的光学效果。在这里，我们研究了等离子金纳米棒阵列和类似结构的镍薄膜的实验线性光学和磁光响应。我们显示这两种类型的结构都揭示了预期的双曲线介质且与epsilon-near-zero（ENZ）和epsilon-near-pole（ENP）点相关的独特光学特征。在含镍的纳米复合材料的情况下，我们观察到在通过结构的传输中线性磁光效应，在这些点附近增加。