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Transmittance and optical constants of Ho films in the 3-1340 eV spevtral range
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The optical constants n and k of holmium (Ho) films were obtained in the 3–1340eV range from transmittance measurements performed at room temperature. Thin films of Ho with various thicknesses were deposited by evaporation in ultra high vacuum conditions and their transmittance was measured in situ. Ho films were deposited onto thin C-film substrates supported on high transmittance grids. Transmittance measurements were used to obtain the extinction coefficient k of Ho films. The refractive index n of Ho was calculated with KramersKro¨nig analysis; in order to do this, k data were extrapolated both on the high and on the low energy parts of the spectrum by using experimental and calculated k values available in the literature. Ho, similar to other lanthanides, has a low-absorption band below the O2,3 edge onset; the lowest absorption was measured at 22 eV. Therefore, Ho is a promising material for filters and multilayer coatings in the energy range below the O2,3 edge in which most materials have a large absorption. Good consistency of the data resulted from the application of f and inertial sum rules. VC 2011 American
Institute of Physics. [doi:10.1063/1.3556451]
Año de Publicación: 2011
Referencia: "Transmittance and optical constants of Ho films in the 3-1340 eV spevtral range."; Monica Fernandez-Perea; Juan I. Larruquert; Jose A. Aznarez; Jose A.Mendez; Luca Poletto; Fabio Frassetto; A. Marco Malvezzi; Daniele Bajoni,3 Angelo Giglia; Nicola Mahne; and Stefano Nannarone
JOURNAL OF APPLIED PHYSICS 109, 083525 (2011) 083525-1, 083525-8
http://dx.doi.org/10.1063/1.3556451
Revista: JOURNAL OF APPLIED PHYSICS
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