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Fabrication and Characterization of Superconductive Coplanar Waveguide Resonators: Fabrication and Characterization of Superconductive Coplanar Waveguide Resonators
KTH, School of Engineering Sciences (SCI), Applied Physics. (Nanostructure Physics)ORCID iD: 0000-0003-0493-7792
2009 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The objective of this thesis is to evaluate a generic process for fabrication and characterization of the Superconductive coplanar waveguide (CPW) resonators. Superconductive CPW resonators with various lengths and shapes are designed to investigate their electrical and magnetic properties as well as resonance properties and sensitivities. In the first part of thesis, two different models are introduced in order to estimate the nonlinear kinetic inductance of a superconducting CPW resonator. The first model is based on Bean critical-state model and the second one is based on current dependence of London penetration depth. The existence of a shift in resonant frequency  of Superconductive CPW resonator caused by a non-linear kinetic inductance is also shown experimentally. Simulations were carried out to estimate the nonlinear kinetic inductance due to the self- induced magnetic field penetration.

The rest of the thesis is concerned with development of very smooth Aluminum (Al) thin films with RMS (Root Mean Square) roughness 1~nm and CAD (Computer Aid Design) of superconductive CPW resonators. Experimental investigation of a generic fabrication technique for superconductive CPW resonator is carried out. Many resonators are fabricated with different design parameters, such as centerline or gap width, film thickness and gap capacitors length. The fabrication process is described in detail. Electron Beam Lithography is used to fabricate Nb and Al CPW resonators which are coupled to outer conductors via gap capacitors. We have fabricated GHz frequency CPW resonators with quality factors, Q up 5X10^5.

Place, publisher, year, edition, pages
Stockholm: Universitetsservice US AB , 2009. , vi, 91 p.
Series
Trita-FYS, ISSN 0280-316X ; 2009:15
Keyword [en]
Coplanar, Waveguide, Resonator, Superconductive, Fabrication, Characterization
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-10419ISBN: 978-91-7415-315-6 (print)OAI: oai:DiVA.org:kth-10419DiVA: diva2:216977
Presentation
2009-05-29, A2:1041, Roslagstullsbacken 21, AlbaNova Universitetscentrum, 15:30 (English)
Opponent
Supervisors
Available from: 2009-05-18 Created: 2009-05-12 Last updated: 2010-10-11Bibliographically approved
List of papers
1. Nonlinearities and parametric amplification in superconducting coplanar waveguide resonators
Open this publication in new window or tab >>Nonlinearities and parametric amplification in superconducting coplanar waveguide resonators
Show others...
2007 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 90, no 25, 253509- p.Article in journal (Refereed) Published
Abstract [en]

Experimental investigations of the nonlinear properties of superconducting niobium coplanarwaveguide resonators are reported. The nonlinearity due to a current dependent kinetic inductanceof the center conductor is strong enough to realize bifurcation of the nonlinear oscillator. Whendriven with two frequencies near the threshold for bifurcation, parametric amplification with a gainof +22.4 dB is observed.

Keyword
Nonlinear oscillator, Parametric amplification
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-11550 (URN)10.1063/1.2750520 (DOI)000247468900098 ()2-s2.0-34547281367 (Scopus ID)
Note

QC 20100812

Available from: 2009-11-20 Created: 2009-11-19 Last updated: 2017-12-12Bibliographically approved

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Ergül, Adem

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