Screening effects in metal sculptured thin films studied with terahertz Mueller matrix ellipsometry

Hofmann, TinoLinköpings universitet,Halvledarmaterial,Tekniska fakulteten,University of North Carolina Charlotte, NC 28223 USA; University of Nebraska, NE USA (författare)

Funding Agencies|National Science Foundation (NSF) through the Nebraska Materials Research Science and Engineering Center [DMR 1420645]; Center for Nanohybrid Functional Materials [EPS-1004094]; Swedish Agency for Innovation Systems [2014-04712]; University of Nebraska-Lincoln; J.A. Woollam Foundation
The anisotropic optical dielectric functions of a metal (cobalt) slanted columnar thin film deposited by electronbeam glancing angle deposition are reported for the terahertz (THz) frequency domain before and after the slanted columnar thin film was passivated by a conformal alumina coating. A simple effective medium dielectric function homogenization approach which describes isolated, electrically conductive columns rendering the thin film biaxial (orthorhombic) is used to model the observed optical responses. Upon passivating the slanted columnar thin film with a 3 nm thick alumina film an increase of both the real and the imaginary part of the dielectric function for all major polarizability directions is found and attributed to screening effects within the spatially coherent metal nanocolumns. (C) 2016 Elsevier B.V. All rights reserved.

NATURVETENSKAP Fysik Den kondenserade materiens fysik hsv//swe
NATURAL SCIENCES Physical Sciences Condensed Matter Physics hsv//eng
Terahertz; Generalized ellipsometry; Bruggeman effective medium; Glancing angle deposition; Sculptured thin film

Knight, S.University of Nebraska, NE USA (författare)
Sekora, D.University of Nebraska, NE USA (författare)
Schmidt, D.University of Nebraska, NE USA (författare)
Herzinger, C. M.JA Woollam Co Inc, NE 68508 USA (författare)
Woollam, J. A.JA Woollam Co Inc, NE 68508 USA (författare)
Schubert, E.University of Nebraska, NE USA (författare)
Schubert, MathiasLinköpings universitet,Halvledarmaterial,Tekniska fakulteten,University of Nebraska, NE USA(Swepub:liu)schma39 (författare)
Linköpings universitetHalvledarmaterial (creator_code:org_t)

Ingår i:Applied Surface Science: ELSEVIER SCIENCE BV421, s. 513-5170169-43321873-5584

Av författaren/redakt...: Hofmann, Tino; Knight, S.; Sekora, D.; Schmidt, D.; Herzinger, C. M.; Woollam, J. A.; visa fler...; Schubert, E.; Schubert, Mathia ...; visa färre...

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