Design and Rigorous Analysis of Non-Paraxial Diffractive Beam Splitter

The direct design of non-paraxial diffractive beam splitters is still a challenge. Due to the quite large diffraction angle, the feature size of the element is in the same order of magnitude as the working wavelength. Hence, the design process is beyond paraxial modeling approaches. Thus, in this example, the Iterative Fourier Transform Algorithm (IFTA) and the Thin Element Approximation (TEA) are used for the initial design of the diffractive element structures, and the Fourier Modal Method (FMM) is applied afterwards for a rigorous performance evaluation, including the investigation of merit function changes in the case of height variations.

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