Dielectric mirrors on a metallic substrate are investigated taking account of absorption in the layers. Simple formulas are obtained for the reflection coefficient of such mirrors. It is shown that the basic obstacle to the achievement of high values of R is absorption in the dielectric layers, and this is the basis for the selection of the best mirror construction. It is also shown that, under certain conditions, the system consisting of a dielectric mirror on a metallic substrate is a selective absorber of wave energy. Simple expressions are obtained allowing the construction of such an absorber to be calculated and its basic spectral characteristics to be determined.
Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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