Thermal properties of NbN single-photon detectors
arXiv:1810.03134 · doi:10.1103/PhysRevApplied.10.064063
Abstract
We investigate thermal properties of a NbN single-photon detector capable of unit internal detection efficiency. Using an independent calibration of the coupling losses we determine the absolute optical power absorbed by the NbN film and, via a resistive superconductor thermometry, the thermal resistance Z(T) of the NbN film in dependence of temperature. In principle, this approach permits a simultaneous measurement of the electron-phonon and phonon-escape contributions to the energy relaxation, which in our case is ambiguous for their similar temperature dependencies. We analyze the Z(T) within the two-temperature model and impose an upper bound on the ratio of electron and phonon heat capacities in NbN, which is surprisingly close to a recent theoretical lower bound for the same quantity in similar devices.
as published
References in corpus (14)
- Detecting Single Infrared Photons with 93% System Efficiency
- Superconducting nanowire single-photon detectors: physics and applications
- Superconducting properties and Hall Effect of epitaxial NbN thin films
- Single-photon detectors based on ultra-narrow superconducting nanowires
- Theory of single photon detection by 'dirty' current-carrying superconducting strip based on the kinetic equation approach
- Vortex-assisted photon counts and their magnetic field dependence in single-photon detectors
- Optical single photon detection in micron-scaled NbN bridges
- Superconducting single-photon detectors with saturated dependence of quantum efficiency vs. bias current
- Intrinsic detection efficiency of superconducting single photon detector in the modified hot spot model
- The electron-phonon relaxation time in thin superconducting titanium nitride films
- Engineering physics of superconducting hot-electron bolometer mixers
- Non-bolometric bottleneck in electron-phonon relaxation in ultra-thin WSi film
- Superconductor-insulator quantum phase transition
- Relaxation of the resistive superconducting state in boron-doped diamond films
Cited by in corpus (6)
- Electron energy relaxation in disordered superconducting NbN films
- Self-Heating Hotspots in Superconducting Nanowires Cooled by Phonon Black-Body Radiation
- Thermal relaxation in metal films limited by diffuson lattice excitations of amorphous substrates
- Universal bottleneck for thermal relaxation in disordered metallic films
- Impact of helium ion irradiation on the thermal properties of superconducting nanowire single-photon detectors
- Stability of thermally bistable states and their switching in superconducting weak link