|
Transmittance and optical constants of erbium films in the 3:25 − 1580 eV spectral range
|
|
 |
| Description: |
|
The optical constants of erbium (Er) films were obtained in the 3:25–1580 eV range from transmittance
measurements performed at room temperature. Thin films of Er were deposited by evaporation in ultra
high vacuum conditions and their transmittance was measured in situ. Substrates consisted of a thin C
film supported on a grid. Transmittance measurements were used to obtain the extinction coefficient k of
the Er films. The refractive index n of Er was calculated using the Kramers–Krönig analysis. k data were
extrapolated both on the high- and low-energy parts of the spectrum by using experimental data and
calculated k values available in the literature. Er, similar to other lanthanides, has a low-absorption
band below the O2;3 edge onset; the smallest absorption was measured at ∼22:5 eV. Therefore, Er is
a promising material for filters and multilayer coatings in the energy range below the O2;3 edge, in which
materials typically have an absorption stronger than at other energies. Good consistency of the data
resulted from the application of f and inertial sum rules. © 2011 Optical Society of America
OCIS codes: 260.7200, 120.4530, 350.2450, 230.4170, 310.6860.
Publication year: 2011
Reference: "Transmittance and optical constants of erbium films in the 3:25 − 1580 eV spectral range"
Juan I. Larruquert, Fabio Frassetto, Sergio García-Cortés, Manuela Vidal-Dasilva, Mónica Fernández-Perea, José A. Aznárez, José A. Méndez, Luca Poletto, A. Marco Malvezzi, Angelo Giglia, and Stefano Nannarone.
20 May 2011 / Vol. 50, No. 15 / APPLIED OPTICS 2211-2219
Magazine: APPLIED OPTICS
|
| |
|
| |
|
