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

Figure 24

(a) Pseudocolor intensity map calculated from the analytical model of the sample. The color scale is normalized to the maximum intensity. The inset shows the beam cross section at the focal point ( μm) and the SEM image of the sample. (b) Schematic of a nanowaveguide array that induces wavefront shaping for OAM generation. (c) SEM picture of the nanowaveguide array. Figures are reproduced from [136, 141].

(a)

(b)

(c)