Rigorous coupled-wave analysis (RCWA), also known as Fourier modal method (FMM), is a semi-analytical, frequency-domain method for solving problems involving the diffraction of electromagnetic waves from periodic structures. It is commonly used for the design and analysis of diffraction gratings, photonic crystals, metamaterials, and other periodic optical elements. It involves expanding the electromagnetic fields and the permittivity of the structure into Fourier series, then solving the resulting coupled-wave equations.
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