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 as in the transparent state. This is of great promise to applications requiring large optical contrast (e.g., optical switches).
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Research Article| January 01 1999
Refractive index changes of Pd-coated magnesium lanthanide switchable mirrors upon hydrogen insertion
K. von Rottkay;
K. von Rottkay, M. Rubin, P. A. Duine; Refractive index changes of Pd-coated magnesium lanthanide switchable mirrors upon hydrogen insertion. J. Appl. Phys. 1 January 1999; 85 (1): 408–413. https://doi.org/10.1063/1.369399
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