Jean-Marc MARTIN | University of Sussex (original) (raw)
Papers by Jean-Marc MARTIN
Applied Physics Letters
We demonstrate the single photon counting mode at 405 and 850 nm with stoichiometric TiN-based mi... more We demonstrate the single photon counting mode at 405 and 850 nm with stoichiometric TiN-based microwave kinetic inductance detectors realized on a sapphire substrate and operated at bath temperatures over 300 mK. The detectors use single 15–25 nm-thick TiN layers featuring a critical temperature in the 2–3 K range. We found that the energy-resolving power R=E/ΔE exhibits an optimum with bath temperature, occurring in the 300–450 mK range, which can be almost double compared to those obtained at the lowest temperatures. Furthermore, the single photon regime is observed up to 700 mK. In addition to a high-temperature operation, the single stoichiometric layer would allow achieving a better uniformity in the critical temperature and, thus, kinetic inductance, compared to the often desired ∼1 K sub-stoichiometric TiN.
Photoniques
Dans cet article, nous présentons les MKIDs, pour « Microwave Kinetic Inductance Detectors », une... more Dans cet article, nous présentons les MKIDs, pour « Microwave Kinetic Inductance Detectors », une nouvelle technologie de détecteur supraconducteur ultrasensible capable de détecter le photon et permettant de couvrir un large spectre électromagnétique allant des ondes millimétriques-submillimétriques aux rayons gamma, en passant par l’optique.
Journal of Low Temperature Physics
To improve the optical coupling in Microwave Kinetic Inductance Detectors (MKIDs), we investigate... more To improve the optical coupling in Microwave Kinetic Inductance Detectors (MKIDs), we investigate the use of a reflective plate beneath the meandered absorber. We designed, fabricated and characterized high-Q factors TiN-based MKIDs on sapphire operating at optical wavelengths with a Au/Nb reflective thin bilayer below the meander. The reflector is set at a quarter-wave distance from the meander using a transparent Al 2 O 3 dielectric layer to reach the peak photon absorption. We expect the plate to recover undetected photons by reflecting them back onto the absorber.
Applied Physics Letters
Large inverse transient phase response of titanium-nitride-based microwave kinetic inductance det... more Large inverse transient phase response of titanium-nitride-based microwave kinetic inductance detectors
Physical Review Applied
A nonlinear analytical model for the pressure dynamics in a vacuum chamber, pumped with a sputter... more A nonlinear analytical model for the pressure dynamics in a vacuum chamber, pumped with a sputter ion pump (SIP), is proposed, discussed and experimentally evaluated. The model describes the physics of the pumping mechanism of SIPs in the context of a cold-atom experiment. By using this model, we fit pumpdown curves of our vacuum system to extract the relevant physical parameters characterizing its pressure dynamics. The aim of this investigation is the optimization of cold-atom experiments in terms of reducing the dead time for quantum sensing using atom interferometry. We develop a calibration method to improve the precision in pressure measurements via the ion current in SIPs. Our method is based on a careful analysis of the gas conductance and pumping in order to reliably link the pressure readings at the SIP with the actual pressure in the vacuum (science) chamber. Our results are in agreement with the existence of essentially two pumping regimes determined by the pressure level in the system. In particular, we find our results in agreement with the well-known fact that for a given applied voltage, at low pressures, the discharge current efficiently sputters pumping material from the pump's electrodes. This process sets the leading pumping mechanism in this limit. At high pressures, the discharge current drops and the pumping is mainly performed by the already sputtered material.
Applied Physics Letters
We demonstrate the single photon counting mode at 405 and 850 nm with stoichiometric TiN-based mi... more We demonstrate the single photon counting mode at 405 and 850 nm with stoichiometric TiN-based microwave kinetic inductance detectors realized on a sapphire substrate and operated at bath temperatures over 300 mK. The detectors use single 15–25 nm-thick TiN layers featuring a critical temperature in the 2–3 K range. We found that the energy-resolving power R=E/ΔE exhibits an optimum with bath temperature, occurring in the 300–450 mK range, which can be almost double compared to those obtained at the lowest temperatures. Furthermore, the single photon regime is observed up to 700 mK. In addition to a high-temperature operation, the single stoichiometric layer would allow achieving a better uniformity in the critical temperature and, thus, kinetic inductance, compared to the often desired ∼1 K sub-stoichiometric TiN.
Photoniques
Dans cet article, nous présentons les MKIDs, pour « Microwave Kinetic Inductance Detectors », une... more Dans cet article, nous présentons les MKIDs, pour « Microwave Kinetic Inductance Detectors », une nouvelle technologie de détecteur supraconducteur ultrasensible capable de détecter le photon et permettant de couvrir un large spectre électromagnétique allant des ondes millimétriques-submillimétriques aux rayons gamma, en passant par l’optique.
Journal of Low Temperature Physics
To improve the optical coupling in Microwave Kinetic Inductance Detectors (MKIDs), we investigate... more To improve the optical coupling in Microwave Kinetic Inductance Detectors (MKIDs), we investigate the use of a reflective plate beneath the meandered absorber. We designed, fabricated and characterized high-Q factors TiN-based MKIDs on sapphire operating at optical wavelengths with a Au/Nb reflective thin bilayer below the meander. The reflector is set at a quarter-wave distance from the meander using a transparent Al 2 O 3 dielectric layer to reach the peak photon absorption. We expect the plate to recover undetected photons by reflecting them back onto the absorber.
Applied Physics Letters
Large inverse transient phase response of titanium-nitride-based microwave kinetic inductance det... more Large inverse transient phase response of titanium-nitride-based microwave kinetic inductance detectors
Physical Review Applied
A nonlinear analytical model for the pressure dynamics in a vacuum chamber, pumped with a sputter... more A nonlinear analytical model for the pressure dynamics in a vacuum chamber, pumped with a sputter ion pump (SIP), is proposed, discussed and experimentally evaluated. The model describes the physics of the pumping mechanism of SIPs in the context of a cold-atom experiment. By using this model, we fit pumpdown curves of our vacuum system to extract the relevant physical parameters characterizing its pressure dynamics. The aim of this investigation is the optimization of cold-atom experiments in terms of reducing the dead time for quantum sensing using atom interferometry. We develop a calibration method to improve the precision in pressure measurements via the ion current in SIPs. Our method is based on a careful analysis of the gas conductance and pumping in order to reliably link the pressure readings at the SIP with the actual pressure in the vacuum (science) chamber. Our results are in agreement with the existence of essentially two pumping regimes determined by the pressure level in the system. In particular, we find our results in agreement with the well-known fact that for a given applied voltage, at low pressures, the discharge current efficiently sputters pumping material from the pump's electrodes. This process sets the leading pumping mechanism in this limit. At high pressures, the discharge current drops and the pumping is mainly performed by the already sputtered material.