ELTE IMAPS 2019 - Effect of spatial dispersion in hyperbolic media

Abstract

First studies on spatial dispersion (nonlocality), i.e., material parameter dependence on wavevector, in nanostructures have considered nonlocality as a parasitic effect deteriorating desired performance of a device [1]. Due to its significant role in nanolayered metamaterials, effect of nonlocality has been widely discussed [1-4]. In particular, relevance of spatial dispersion has been also observed for strong near- field interactions arising from resonances in nanocomposites, such as negative-index metamaterials [3]. Until now, different formalisms have been developed and successfully applied, e.g., by introducing correction terms [2] or deriving fully nonlocal effective permittivity tensor [4]. Hereby, we study nonlocality in multilayered hyperbolic metamaterials, a special class of anisotropic metamaterial. Our efforts are focused on employment of spatial dispersion as a additional degree of freedom in tailoring properties, rather than parasitic effect. In particular, we present possibility of shaping effective dispersion of the structure by inducing nonlocality.