Turin Shroud: neutrons and protons produced by interaction of γ photons with the buried body, i.e. reaction 16O(γ, n)15O
in giant dipole resonance, followed by 14N(n, p)14C, could have biased radio-dating, and formed the image
By evaporating an infinitely thin layer of perfectly conducting metal on the small facet of the groove of a dielectric echelette grating then by superimposing an adequate inhomogeneous layer on top of the large facet, it is shown that a theoretical efficiency of 100% is obtained in a transmitted order. A numerical proof of this theoretical prediction is achieved using a computer code based on a rigorous finite-elements method. The curves of efficiency near the blazing effect show remarkable widths.
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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