Transmittance and optical constants of Lu films in the 3–1800 eV spectral range

Abstract

A microscopic study of strongly plasmonic Au and Ag island thin films J. Appl. Phys. 113, 034302 (2013) Near-field simulation of obliquely deposited surface-enhanced Raman scattering substrates J. Appl. Phys. 112, 113111 (2012) Characterization of Ru thin-film conductivity upon atomic layer deposition on H-passivated Si(111) J. Appl. Phys. 112, 113517 (2012) Optical response in subnanometer gaps due to nonlocal response and quantum tunneling Appl. Phys. Lett. 101, 233111 (2012) Additional information on J. Appl. Phys. The optical constants n and k of lutetium ͑Lu͒ films were obtained in the 3-1800 eV range from transmittance measurements performed at room temperature. These are the first experimental optical constant data of Lu in the whole range. Thin films of Lu with various thicknesses were deposited by evaporation in ultrahigh vacuum conditions and their transmittance was measured in situ. Lu films were deposited onto grids coated with a thin, C support film. Transmittance measurements were used to obtain the extinction coefficient k of Lu films. The refractive index n of Lu was calculated with Kramers-Krönig analysis. k data were extrapolated both on the high and on the low-energy sides by using experimental and calculated k values available in the literature. Lu, similar to other lanthanides, has a low-absorption band below the O 2,3 edge onset; the lowest absorption was measured at ϳ25.1 eV. Therefore, Lu is a promising material for filters and multilayer coatings in the energy range below the O 2,3 edge in which most materials have a large absorption. Good consistency of the data was obtained through f and inertial sum rules.

Study of Optical Performance and Structure of Yb/Al (1.5 wt.% Si) and Yb/Al (Pure) Multilayers Designed for the 73.6 nm Range

“…Among lanthanide materials, ytterbium (Yb) has a lower absorption coefficient in the 55-90 nm range [18]. Yb/Al multilayer films can enhance reflectivity in this spectrum.…”

Transmittance and optical constants of Ca films in the 4–1000 eV spectral range

“…That is the case for Ca metal. Materials with the common property of a moderately low absorption in the smallphoton energy EUV have been fully characterized in the last years; they include the alkaline earths Mg [1] and Sr [2] and the whole set of the lanthanides metals, excluding radioactive Pm (La [3,4], Ce [5], Pr [6], Nd [4], Sm [7], Eu [8], Gd [4], Tb [3,4], Dy [4], Ho [7,9], Er [7,10], Tm [11], Yb [12,13], and Lu [14]), along with metals with close properties: Sc [15,16] and Y [17].…”

Transmittance and optical constants of Sr films in the 6–1220 eV spectral range

“…The EUV data available suggest that alkaline-earth metals [1][2][3][4] have low-absorption bands in parts of the EUV, which makes alkaline-earths promising materials for multilayer coatings or absorption filters. Their lowabsorption in the long wavelengths of the EUV, particularly of Sr and Ba, 1 is shared also by lanthanides, which have been recently characterized in a broad range including the EUV: La, 5,6 Ce, 7 Pr, 8 Nd, 6 Sm, 9 Eu, 10 Gd, 6 Tb, 5,6 Dy, 6 Ho, 9,11 Er, 9,12 Tm, 13 Yb, 14,15 and Lu, 16 along with materials with close properties such as Sc [17][18][19][20] and Y. 21 Few data on the optical constants of Sr were found in the literature.…”