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Screening effects in metal sculptured thin films studied with terahertz Mueller matrix ellipsometry
Linköpings universitet, Institutionen för fysik, kemi och biologi, Halvledarmaterial. Linköpings universitet, Tekniska fakulteten. University of North Carolina Charlotte, NC 28223 USA; University of Nebraska, NE USA.
University of Nebraska, NE USA.
University of Nebraska, NE USA.
University of Nebraska, NE USA.
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2017 (engelsk)Inngår i: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 421, s. 513-517Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

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.

sted, utgiver, år, opplag, sider
ELSEVIER SCIENCE BV , 2017. Vol. 421, s. 513-517
Emneord [en]
Terahertz; Generalized ellipsometry; Bruggeman effective medium; Glancing angle deposition; Sculptured thin film
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Identifikatorer
URN: urn:nbn:se:liu:diva-141109DOI: 10.1016/j.apsusc.2016.12.200ISI: 000408756700039OAI: oai:DiVA.org:liu-141109DiVA, id: diva2:1144787
Merknad

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

Tilgjengelig fra: 2017-09-27 Laget: 2017-09-27 Sist oppdatert: 2018-01-12

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