%0 Journal Article %J Journal of Applied Physics %D 1999 %T Refractive Index Changes of Pd-Coated Magnesium Ianthanide Switchable Mirrors Upon Hydrogen Insertion %A Klaus von Rottkay %A Michael D. Rubin %A Peter A. Duine %X

The optical effect upon insertion of hydrogen into Pd-coated magnesium lanthanide switchable mirrors is investigated in terms of the changes of their complex refractive indices. A significant change in the optical constants of LnMg layers is seen between the as-deposited state and the dehydrided state after one cycle. Furthermore, the optical effect of switching the Pd cap layer to a PdH cap layer was determined. It is shown that the Pd layer mainly limits the visible transmittance of the hydrided stack to about 35%-40%. Whereas the extinction coefficient of dehydrided LnMg layers at 550 nm is between 2.2 and 3.1, it is as low 10-4 as in the transparent state. This is of great promise to applications requiring large optical contrast (e.g., optical switches).

%B Journal of Applied Physics %V 85 %P 408-413 %8 01/1999 %G eng %N 1 %1

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%2 LBNL-41976 %& 408 %R 10.1063/1.369399