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

Figure 22

(a) Schematic diagram of the planar lens. (b) The cross section showing the -component of the electric field of the 1st-order mode from a single slit. (c) The evolution of the single-slit transmission spectrum for different crystallization levels. (d) The relative phase and (e) the normalized electric field intensity at 1.55 μm as functions of the crystallization level with a 5% step increment. (f) Focusing pattern measured in -plane by confocal scanning optical microscopy for different status of GST. Figures are reproduced from [135].