We propose to complete a radial shear differential interference contrast (DIC) microscope based on Greek-ladder sieves, in which three structures are set up to demonstrate the feasibility of radial shear interference phase contrast imaging. A detailed analysis and mathematical derivation is presented based on the fact that DIC contrast is spatially separated by the optical path difference of two interfering beams in a small focal volume, focusing on the optical range difference between the three structures. An important reference is provided for subsequent applications, in particular radial shear differential interference in the localisation of surface damage points and tweezers in large-scale integrated circuits.
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