Triple wire medium for use in isotropic metamaterials

Abstract

Abstract-In the paper a triple wire medium is described as an isotropic negative permittivity medium.A numerical experiment was performed to validate the propagation of electromagnetic waves inside the wire mesh below the plasma frequency, where the effective medium permittivity is negative. For a practical realization, a form of the triple wire medium using a planar technology is proposed.

Dark Mode Excitation in Three-Dimensional Interlaced Metallic Meshes

“…As shown in Figure 2c, this gives excellent agreement with the simulated dispersion of the transmitted mode. While the behavior of a wire grid metamaterial is well-established, for the simplest case of a cubic grid, there has been limited experimental evidence showing the dispersion relation across the Brillouin zone for this structure due to difficulties in fabrication, 10,11 which we here demonstrate can be surpassed using 3D printing techniques.…”

“…■ EXPERIMENTAL OBSERVATION OF SINGLE MESH MODES It has historically been very difficult to examine 3D meshes experimentally due to the problems with fabrication, and previous studies show samples, usually made from sheets of PCB fitted together, 2,10 and always only a few unit cells thick, 11 allowing for limited exploration. However, with modern 3D printing technology, it is now possible to fabricate very complex structures with far fewer processing restrictions than conventional manufacturing techniques.…”

“… 1 , 2 This has been fundamental for establishing negative-permittivity materials used in the experiments that have brought metamaterials into the public eye, leading to effects such as negative refraction, 3 , 4 spoof plasmons, 5 − 7 and cloaking. 8 , 9 However, beyond some early proof-of-concept studies which only showed samples of a very limited scale, 10 , 11 the difficulty of fabrication of these grids has meant that they have received little experimental attention.…”

“…Three-dimensional structures constructed from thin metal wires have been central to the field of metamaterials since its origins. One of the earliest key discoveries in the field was that a grid or mesh of thin, electrically conductive wires behaves like a low density plasma, or dilute metal, with a plasma frequency that is tunable via the structural parameters of the grid. , This has been fundamental for establishing negative-permittivity materials used in the experiments that have brought metamaterials into the public eye, leading to effects such as negative refraction, , spoof plasmons, − and cloaking. , However, beyond some early proof-of-concept studies which only showed samples of a very limited scale, , the difficulty of fabrication of these grids has meant that they have received little experimental attention.…”