Development of metamaterials with desired broadband optical properties

Abstract

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All-angle broadband ENZ metamaterials

“…However, all of them are confined at a single operating frequency or a narrow frequency range. Based on the studies on the broadband optical response of metamaterials [25] and on the dynamic-controllable metamaterials [26], previous research has already suggested methods, numerically [27][28][29] and theoretically [30][31][32][33][34][35][36], to achieve the broadband ENZ metamaterials with various microstructures but of great anisotropic properties, which The (a) two-dimensional and (b) three-dimensional schematic profile of one unit cell of the all-angle broadband ENZ metamaterial with respect to the probing electromagnetic wave. The unit cell effectively contains N = 6 layers, in which the 6th layer is placed in the centre, and other five layers are symmetrically placed on the two sides.…”

Superpositions of Lorentzians as the class of causal functions

“…This leads to the following question: Starting with a target response, how can one realize an approximation of it? Towards this end, it has been proposed to use layered metamaterials [19]. Our article considers more generally the possibility of engineering artificial response functions through the realization of a finite number of Lorentzians; a method which may be applicable to a variety of metamaterials.…”