Braig C, Fritzsch L, Käsebier T, Kley E-B, Laubis C, Liu Y, Scholze F, Tünnermann A
Friedrich-Schiller-Universität Jena, Institut für Angewandte Physik, Jena, Germany.
Opt Express. 2012 Jan 16;20(2):1825-38. doi: 10.1364/OE.20.001825.
We present an innovative grating design based on conical diffraction which acts as an almost perfect and low-loss beamsplitter for extreme ultraviolet radiation. The scheme is based on a binary profile operated in grazing incidence along the grating bars under total external reflection. It is shown that periods of a few 10(2) nm may permit an exclusive (±1)(st) order diffraction with efficiencies up to ~ 35% in each of them, whereas higher evanescent orders vanish. In contrast, destructive interference eliminates the 0(th) order. For a sample made of SiO(2) on silicon, measured data and simulated results from rigorous coupled wave analysis procedures are given.
