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Diffraction Analysis of Finite Cross-Section Light Beam on Grating with Normal Incidence

Method for the diffraction analysis of a finite beam cross-section on the grating, which is based on the expansion of the field amplitude on plane waves using the Fourier transform, has been developed. Diffraction analysis using known methods, for example RCWA was carried out for each plane wave with certain amplitude. The field distribution of the reflected and transmitted wave was determined by the inverse Fourier transform. The method was used for the beam whose field distribution is described by the impulse function.