231 citations · 1.5k across the 62 of their papers we have counts for
9 papers · 1 filter
Nonlinear characteristics of Ti, Nb, and NbN superconducting resonators for parametric amplifiers
Songyuan Zhao, Stafford Withington, Christopher Niall Thomas
Superconducting resonators and parametric amplifiers are important components in scientific systems such as kinetic inductance detector arrays, frequency-domain multiplexers for ot…
Calculation and measurement of critical temperature in thin superconducting multilayers
Songyuan Zhao, David J. Goldie, Chris N. Thomas +1
We have applied the Usadel equations to thin-film multilayer superconductors, and have calculated the critical temperature for general thin-film S-S' bilayer. We extended the bilay…
Electromagnetic models for multilayer superconducting transmission lines
Songyuan Zhao, Stafford Withington, David J. Goldie +1
Thin-film superconducting transmission lines play important roles in many signal transmission and detection systems, including qubit coupling and read-out schemes, electron spin re…
Exploring the performance of thin-film superconducting multilayers as Kinetic Inductance Detectors for low-frequency detection
Songyuan Zhao, David J. Goldie, Stafford Withington +1
We have solved numerically the diffusive Usadel equations that describe the spatially-varying superconducting proximity effect in Ti-Al thin-film bi- and trilayers with thickness v…
Broadband illumination of superconducting pair breaking photon detectors
Tejas Guruswamy, David J. Goldie, Stafford Withington
Understanding the detailed behaviour of superconducting pair breaking photon detectors such as Kinetic Inductance Detectors requires knowledge of the nonequilibrium quasiparticle e…
The non-equilibrium response of a superconductor to pair-breaking radiation measured over a broad frequency band
P. J. de Visser, S. J. C. Yates, T. Guruswamy +7
We have measured the absorption of terahertz radiation in a BCS superconductor over a broad range of frequencies from 200 GHz to 1.1 THz, using a broadband antenna-lens system and…
Quasiparticle effective temperature in superconducting thin films illuminated at THz frequencies
Tejas Guruswamy, David J. Goldie, Stafford Withington
The response of superconducting pair-breaking detectors is dependent on the details of the quasiparticle distribution. In Kinetic Inductance Detectors (KIDs), where both pair break…
Evidence of a nonequilibrium distribution of quasiparticles in the microwave response of a superconducting aluminium resonator
P. J. de Visser, D. J. Goldie, P. Diener +3
In a superconductor absorption of photons with an energy below the superconducting gap leads to redistribution of quasiparticles over energy and thus induces a strong non-equilibri…
Non-equilibrium superconductivity in superconducting resonators
D. J. Goldie, S. Withington
We have calculated the non-equilibrium quasiparticle and phonon distributions , , where and are the quasiparticle and phonon energies respectively, generated by…