The analysis of initial phase of diffraction wave of grating mask is based on rigorous coupled-wave analysis method. In this paper, the general diffraction analysis numerical code based on the rigorous coupled-wave analysis (RCWA) is written by MATLAB software to calculate the 0th refraction wave of grating mask. Since large measurement errors will occur while measuring the grove shape by AFM, the method of measuring the initial phase of diffraction wave was proposed and the feasibility of this method has also been verified.
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