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Computationally efficient scalar nonparaxial modeling of optical wave propagation in the far-field

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Abstract

We present a scalar model to overcome the computation time and sampling interval limitations of the traditional Rayleigh–Sommerfeld (RS) formula and angular spectrum method in computing wide-angle diffraction in the far-field. Numerical and experimental results show that our proposed method based on an accurate nonparaxial diffraction step onto a hemisphere and a projection onto a plane accurately predicts the observed nonparaxial far-field diffraction pattern, while its calculation time is much lower than the more rigorous RS integral. The results enable a fast and efficient way to compute far-field nonparaxial diffraction when the conventional Fraunhofer pattern fails to predict correctly.

© 2014 Optical Society of America

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