Figure 6

(a) Schematic diagram of the designed device to generate two diffractions at two wavelengths. (b,e) Required phase and amplitude profiles at 0.6 and 0.75 THz, respectively. (c,f) Simulated y-polarized electric field distributions at 0.6 and 0.75 THz, respectively. (d,g) Retrieved diffraction orders through Fourier Transformation at 0.6 and 0.75 THz, respectively.