fig6
Figure 6. 2D isotropic angular responses of the nonlocal metasurface-based optical differentiators. (A-C) 2D transmission coefficients of second-order optical differentiators at desired operation wavelengths of 1,250, 1,300 and 1,350 nm, respectively. (D-F) 2D transmission coefficients of fourth-order optical differentiators at desired operation wavelengths of 1,250, 1,300 and 1,350 nm, respectively.
