Epsilon-negative media from the viewpoint of materials science

Abstract

A comprehensive review of the fundamentals and applications of epsilon-negative materials is presented in this paper. Percolative composites, as well as homogeneous ceramics or polymers, have been investigated to obtain the tailorable epsilon-negative properties. It's confirmed the anomalous epsilon-negative property can be realized in conventional materials. Meanwhile, from the perspective of materials science, the relationship between the negative permittivity and the composition and microstructure of materials has been clarified. It's demonstrated that the epsilon-negative performance is attributed to the plasmonic response of delocalized electrons within the materials and can be modulated by it. Moreover, the potential applications of epsilon-negative materials in electromagnetic interference shielding, laminated composites for multilayered capacitance, coil-less electric inductors, and epsilon-near-zero metamaterials are reviewed. The development of epsilon-negative materials has enriched the connotation of metamaterials and advanced functional materials, and has accelerated the integration of metamaterials and natural materials.

Deposition of carbon nanolayers by PECVD on ceramic substrates

“…For the ratio between the intensities of the D and G peaks associated with the crystal structure of the graphene sheet, we obtain ratio I(D)/I(G) = 1.05, which is consistent with expectations for graphene multiwall structures. The deposition of graphene layers and structures on silicon carbide is related also to the synthesis of new composite metamaterials [11]. An atomic force microscope was applied to determine the thickness of the graphene layers on the SiO 2 /Si substrates.…”

Electronic, Elastic, Optical, and Thermodynamic Properties Study of Ytterbium Chalcogenides Using Density Functional Theory

“…As it can be seen from Figure 5, the real dielectric function of ytterbium chalcogenides is negative for some frequency ranges. This is attributed to the plasmonic response of delocalized electrons within the materials and can be modulated by it [33]. This demonstrates their additional potential for unique optical and microwave applications such as microwave circuits, optical switches, and modulators, antenna components, in electromagnetic intereference shielding and coil-less electric inductors [34].…”

High temperature study of dielectric and electrical conduction behaviour of La2NiO4

“…Researchers have undertaken extensive investigations into the phenomenon of negative permittivity, employing diverse methodologies that vary from composite materials to single-phase materials. In 2020, a review article was published on the synthesis and dielectric characterization of polymer matrix composites and ceramic matrix composites [13]. In these composites, negative permittivity is realized only when metals are in a threshold amount or they have a critical percolating structure.…”