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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 - Condensed Matter and Materials Physics, 80 (5), 054510-1-054510-10. American Physical Society. 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


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.

Item URL in elib:https://elib.dlr.de/60355/
Document Type:Article
Title:Optical and transport properties of ultrathin NbN films and nanostructures
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Bartolf, HolgerUniversity of ZürichUNSPECIFIED
Engel, AndreasUniversity of ZürichUNSPECIFIED
Schilling, AndreasUniversity of ZürichUNSPECIFIED
Ilin, KonstantinUniversity of KarlsruheUNSPECIFIED
Siegel, MichaelUniversität KarlsruheUNSPECIFIED
Schneider, RUniversität KarlsruheUNSPECIFIED
Gerthsen, DUniversity of KarlsruheUNSPECIFIED
Gippius, NikolayUniversité Blaise Pascal, Aubiere, FranceUNSPECIFIED
Date:August 2009
Journal or Publication Title:Physical Review B - Condensed Matter and Materials Physics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
DOI :10.1103/PhysRevB.80.054510
Page Range:054510-1-054510-10
Publisher:American Physical Society
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 assignment
DLR - Research area:Space
DLR - Program:W - no assignment
DLR - Research theme (Project):W - no assignment (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Terahertz and Infrared Sensors
Deposited By: Semenov, Prof.Dr. Alexey
Deposited On:02 Nov 2009 13:52
Last Modified:19 Oct 2021 09:57

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