Coherence and nonlinearity in mechanical and josephson superconducting devices

Shun Yanai

Research output: ThesisDissertation (TU Delft)

16 Downloads (Pure)


In this thesis, the microwave detection of mechanically compliant objects is investigated. This starts with a system of a suspended metal drum capacitively coupled to a high impedance microstrip resonator. The mechanical non-linear dissipation of the drums is studied. Next, a suspended nanowire coupled to a CPW resonator is studied. With an electrostatic drive at twice the mechanical resonance frequency, there occurs a parametric excitation of either the mechanical signal or the coupled microwave resonance frequency of the cavity. Then the microwave loss in flux-tunable resonators is investigated for future experiments. One of the goals of this project was to couple a suspended nanowire with a SQUID loop of a flux tunable cavity. Here, the dielectric loss in flux tunable resonators is studied in order to optimize the design of future devices.
Original languageEnglish
Awarding Institution
  • Delft University of Technology
  • Steele, G.A., Supervisor
  • van der Zant, H.S.J., Supervisor
Award date28 Nov 2018
Print ISBNs978.90.8593.376.2
Publication statusPublished - 2018


  • mechanical oscillators
  • parametric excitation
  • Josephson junctions
  • SQUIDs
  • TLSs
  • cavity optomechanics
  • nanotechnology


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