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The possibility of concentrating all the transmitted energy into one spectral order is established for a triangular groove dielectric grating for which a thin layer of per fectly conducting metal is evaporated on the small facet. The reflected energy is then only equal to the Fresnel reflectance (i. e. " 4 ). When an antireflection coating is evaporated on the large facet the transmitted efficiency can reach 100 into the first order.
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Michel Neviere, Daniel R. Maystre, Jean-Pierre Laude, "Transmission gratings: an extension of the Marechal and Stroke condition," Proc. SPIE 1319, Optics in Complex Systems, (1 July 1990); https://doi.org/10.1117/12.34723