Abstract

In this study, an actual-size concave grating with structural randomness is numerically analyzed. Numerical electromagnetic analyses that solve Maxwell’s equations can provide rigorous diffracted fields including the polarization characteristics. However, because of high computational costs, actual-size gratings with no periodicity have seldom been analyzed. We apply the difference-field boundary element method (DFBEM) for the analyses of actual-size concave gratings with 10,000 random blazed grooves. The DFBEM provides vectorial diffracted or scattered waves with very low computational resources. First, we estimate the accuracy of the computation results, and then we show some relations between the degree of randomness and the diffraction efficiency, including the polarization dependency.

© 2017 Optical Society of America

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