Engineering topics
Shaw, M. D.
Publications and source records attributed to Shaw, M. D..
Thin Film Thermal Conductivity Measurements using Superconducting Nanowires
We present a simple experimental scheme for estimating the cryogenic thermal transport properties of thin films using superconducting nanowires. In a parallel array of nanowires, the heat from one nanowire in the normal state changes the local temperature around adjacent nanowires, reducing their switching current. Calibration of this change in switching current as a function of bath temperature provides an estimate of the temperature as a function of displacement from the heater. This provides a method of determining the contribution of substrate heat transport to the cooling time of superconducting nanowire single photon detectors. Understanding this process is necessary for successful electrothermal modeling of superconducting nanowire systems.
Optically Lithographed WSiX Superconducting Nanowire Single Photon Detectors (SNSPDs) Demonstrated near 1550 Nm
No abstract available
Mid-Infrared Single-Photon Detection with Tungsten Silicide Superconducting Nanowires
No abstract available
Electron Heating and Quasiparticle Tunnelling in Superconducting Charge Qubits
We have directly measured non-equilibrium quasiparticle tunnelling in the time domain as a function of temperature and RF carrier power for a pair of charge qubits based on the single Cooper-pair box, where the readout is performed with a multiplexed quantum capacitance technique. We have extracted an effective electron temperature for each applied RF power, using the data taken at the lowest power as a reference curve. This data has been fit to a standard T? electron heating model, with a reasonable correspondence with established material parameters.