EPJ Applied Metamaterials Special Issue on “Metamaterial-by-Design: Theory, Methods, and Applications to Communications and Sensing”

Transformation-Optics-Based Design of a Metamaterial Radome for Extending the Scanning Angle of a Phased-Array Antenna

“…Nevertheless, for moderate values of the angular enhancement factor α, for which the modal coupling can be expected to be not particularly strong, the approximation in (19) may be used as a rough estimate of the (average) wave impedance. This yields in turn the SWR estimate in (9), which has been verified to be in line with the results obtained via full-wave numerical simulations.…”

“…From the near-field map [ Fig. 6(a)], we can observe the steering effect and, from the standing-wave pattern in the inner region r < R 1 we can estimate a SWR ≈ 1.5, which is in line with the prediction in (9). The angular enhancement is more apparent in the far-field pattern [ Fig.…”

“…Metamaterial synthesis has several traits in common with inverse-scattering problems [8], and likewise poses some formidable computational challenges. Within the emerging framework of "metamaterial-by-design" [9], the "transformation-optics" (TO) approach [10], [11] stands out as a systematic strategy to analytically derive the idealized material "blueprints" necessary to implement a desired fieldmanipulation interpreted as a local distortion of the coordinate reference frame. Several extensions have also been proposed in order to accommodate effects (e.g., nonlinear, nonreciprocal, bianisotropic, magneto-electric, artificial-moving, space-time, nonlocal, non-Hermitian, topological) and observables (e.g., resonances, optical forces, density of states) not encompassed by the original formulation (see, e.g., [12]- [26]).…”

Terahertz Metamaterial Absorbers

“…All these advantages make the terahertz metamaterial absorbers (TMAs) have tremendous application value in many fields like communication, imaging, detection, and security. [ 7,11–21 ]…”

“…[11] Nowadays, the MPA is widely applied in various fields, such as bioimaging, [12,13] photothermal detection, [14] biosensing, [15,16] and high transmission rate communication. [17,18] The study on MPA has also promoted those on the terahertz wave, a blank gap in the past. [19] The terahertz wave has larger bandwidth and higher signal-to-noise ratio than the microwave, and has lower energy and higher safety compared with high energy X-rays.…”