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(a) Experimental scheme to characterize the imaging quality of the FZP; (b) Demonstration of resolution needed to perform FZP direct imaging and FZP-OFM imaging; (c) Measured FWHM spot size of the image in x and y-direction versus the x position of a 1-μm pinhole. Pinhole images in three different positions are shown. The resolution limit of the FZP and the resolution needed for the FZP-OFM imaging are indicated.
