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Figure 7. Nonlocal metasurface-based optical differential operations for Gaussian beam. (A-C) Normalized electric field |Ex| distributions of second-order optical differentiators under the normal incidence of Gaussian beam at 1,250, 1,300 and 1,350 nm, respectively. (D-F) Normalized electric field |Ex| distribution of fourth-order optical differentiators under the normal incidence of Gaussian beam at 1,250, 1,300 and 1,350 nm, respectively.
