Three-Dimensional Broadband and Isotropic Double-Mesh Twin-Wire Media for Meta-Lenses

Lenses are used for multiple applications, including communications, surveillance and security, medical instruments. In homogeneous lenses, the contour is to control electromagnetic propagation. Differently, graded-index lenses make use of inhomogeneous materials, which an extra degree freedom. This freedom enables design devices with a high performance. For instance, rotationally symmetric without spherical aberrations, e.g., Luneburg lens, can be designed. However, manufacturing such more complex. One possible approach implement these using metamaterials, able produce equivalent refractive indices. Here, we propose new type three-dimensional metamaterial formed two independent sets wires. The double-mesh twin-wire structure permits propagation first mode cut-off frequency low dispersion isotropy. These properties similar periodic structures higher symmetries, as glide symmetry. variations index achieved dimension meandered potential this demonstrated simulated results meta-lens.