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Optical and transport properties of ultrathin NbN films and nanostructures

Semenov, Alexej and Günther, Burghardt and Böttger, Ute and Hübers, H.-W. and Bartolf, Holger and Engel, Andreas and Schilling, Andreas and Ilin, Konstantin and Siegel, Michael and Schneider, R and Gerthsen, D and Gippius, Nikolay (2009) Optical and transport properties of ultrathin NbN films and nanostructures. Physical Review B, 80 (5), 054510-1-054510-10. APS. DOI: 10.1103/PhysRevB.80.054510.

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Official URL: http://scitation.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=PRBMDO000080000005054510000001&idtype=cvips&prog=normal

Abstract

Optical and transport properties of a series of ultrathin NbN films with different thickness grown on sapphire have been evaluated by means of spectral ellipsometry and dc measurements of superconducting critical parameters. The growth process and thus the nitrogen content have been optimized for each film in the series to achieve the highest superconducting transition temperature, which however increases with the film thickness. Optical and transport measurements agree in slowly increasing disorder while the electron density of states at the Fermi level shows a twofold decrease when the film thickness drops from 14 to 3 nm. Nearinfrared extinction spectra of nanowire gratings from our films are well described by the scattering matrix method that uses optical parameters of nonstructured films and the grating geometry. The technique provides an attractive tool for analyzing various devices for nanophotonics.

Document Type:Article
Title:Optical and transport properties of ultrathin NbN films and nanostructures
Authors:
AuthorsInstitution or Email of Authors
Semenov, AlexejUNSPECIFIED
Günther, BurghardtUNSPECIFIED
Böttger, UteUNSPECIFIED
Hübers, H.-W.UNSPECIFIED
Bartolf, HolgerUniversity of Zürich
Engel, AndreasUniversity of Zürich
Schilling, AndreasUniversity of Zürich
Ilin, KonstantinUniversity of Karlsruhe
Siegel, MichaelUniversität Karlsruhe
Schneider, RUniversität Karlsruhe
Gerthsen, DUniversity of Karlsruhe
Gippius, NikolayUniversité Blaise Pascal, Aubiere, France
Date:August 2009
Journal or Publication Title:Physical Review B
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:80
DOI:10.1103/PhysRevB.80.054510
Page Range:054510-1-054510-10
Publisher:APS
Status:Published
Keywords:74.25.Fy, 74.78.Na, 74.25.Nf
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W - no assignement
DLR - Research area:Space
DLR - Program:W - no assignement
DLR - Research theme (Project):W -- no assignement (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Terahertz and Infrared Sensors
Deposited By: Prof.Dr. Alexey Semenov
Deposited On:02 Nov 2009 13:52
Last Modified:07 Feb 2013 20:16

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