Figure 4
Comparison of calculated performance for DGSPR and single-resonator eight-element supercells. (a) Color map of calculated reflection coefficient amplitude with imposed contours representing reflected phase for DGSPR (left panel) and single-resonator (right panel) unit cells for system parameters of \(P_x=P_y={330}\,\hbox {nm}\), \(t_m = t_s = {70}\,\hbox {nm}\), \(d_x={90}\,\hbox {nm}\), \(t_b=g={50}\,\hbox {nm}\), \(\lambda _0={900}\,\hbox {nm}\) and normal incident TM polarized light. For the single-resonator unit cell the \(d_x\) and g parameters are ignored as they are meaningless, and the nanobrick is centered on the unit cell. The separation between phase contours is \({45}^\circ\) for the detuned resonators and \({90}^\circ\) for the single resonators. Circular markers represent nanobricks selected for supercell modeling. (b) Supercell sketches for beam steering along the positive x-direction for DGSPR and single-resonator configurations and for both TM and TE polarization. (c) Calculated diffraction efficiencies for orders \(|m|\le 2\) as a function of wavelength of incident light for TM and TE polarization and for DGSPR and single-resonator supercells indicated by solid and dashed lines, respectively.
