Abstract
Planar absorption reflection gratings are analysed using the characteristic-matrix method. General sinusoidal modulation with arbitrary starting and ending phase is assumed. The region where the two-wave first order coupled-wave theory is valid is determined and defined by a regime-indicator ϱ. It is shown that if ϱ ⩾ 10 the coupled wave theory may be used to predict the efficiencies of absorption reflection gratings for pure cosine-modulation. By varying the starting phase of cosine modulations it is found that a slightly higher efficiency is given by the π/3-grating.
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