Figure 4
From: High-efficiency chirality-modulated spoof surface plasmon meta-coupler
Near-field characterizations of the high-efficiency PB meta-coupler. (a) Sample picture and experimental setup to demonstrate the SPP excitation performance of the proposed PB meta-coupler. Using the RCP antenna to normally illuminate the central PB metasurface, we respectively adopted the electric and magnetic probers to measure Ez (c) and Hz (e) field distributions (real part) above PB meta-coupler at the frequency 10 GHz, verified well by FEM simulation results (c,e). Based on the same near-field mapping technique, dispersion relations of TE and TM polarized SPPs on the mushroom (open stars in Fig. 2d) are also retrieved, matching well with simulated results by FEM eigen-mode calculations (see Fig. 3c).
