Fig. 2: Design principle and numerical simulation of the integrated resonant unit.
From: Intensity-asymmetric wavefront shaping in nonlocal meta-lens
a Asymmetric electric field enhancement ratio |EF/EB | 2 (colored square and spheres) and resonant wavelengths as a function of offset L. Blue and red regions represent the bandwidths of local and nonlocal resonances, respectively. EF(B) represents the forward (backward) average electric field amplitude inside the integrated-resonant unit (IRU). b Simulated (top) and experimental (bottom) transmission spectra under forward (solid lines) and backward (dashed) incidences. c Electric dipole (ED) and magnetic dipole (MD) contributions for both propagation directions. Insets display the electric field distributions in the xy plane, taken at the center of IRU, normalized by the incident field amplitude ( | EF(B)/E0 | ). d Transmission (color map) and phase (markers) as functions of the IRU rotation angle. Phases are extracted at the resonant wavelength of 1570 nm in the periodic IRU, selecting right (RCP) or left (LCP) circular polarization in the fundamental (linear) and harmonic waves.
