Taming the Electromagnetic Boundaries via Metasurfaces: From Theory and Fabrication to Functional Devices

Figure 18

(a) The schematic of the ultrawideband absorber with optimal thickness. Top: the equivalent circuit model. Bottom: the actual realization of the absorber. The resistive layers are periodic square patches with periodicity (), width (), and sheet resistivity (). (b) The frequency response of the reflection coefficient for the ultrawideband absorber with optimal thickness obtained from both the equivalent circuit model and the full-wave simulation. (c) Optical transmittance for the optical-transparent absorber. Inset shows the photograph. (d) Microwave absorption for both the experiment and the full-wave simulation. Figures are reproduced from (a, b) [110] and (c, d) [2].

(a)

(b)

(c)

(d)