Janaszek Bartosz, Szczepański Paweł
Opt Express. 2020 May 11;28(10):15447-15458. doi: 10.1364/OE.392596.
In this study, we investigate an effect of spatial dispersion in anisotropic metamaterials of regular periodic geometry. We indicate conditions under which a local and nonlocal approach are convergent, as well as the areas of particularly strong nonlocality. Our analysis also reveals that new resonance transitions altering the topology of an iso-frequency surface arise in the presence of spatial dispersion. For the first time, we demonstrate that nonlocality can serve as a new mechanism for tailoring effective dispersion of an anisotropic metamaterial, which opens new venues for novel applications requiring strong direction discrimination of the incident radiation.
在本研究中，我们研究了具有规则周期性几何结构的各向异性超材料中空间色散的影响。我们指出了局部和非局部方法收敛的条件，以及特别强的非局部性区域。我们的分析还表明，在存在空间色散的情况下会出现改变等频面拓扑结构的新共振跃迁。我们首次证明，非局部性可作为一种调整各向异性超材料有效色散的新机制，这为需要对入射辐射进行强方向分辨的新型应用开辟了新途径。
