A5039280079- Superconducting and THz Device Technology
- Physics of Superconductivity and Magnetism
- Microwave Engineering and Waveguides
- Radio Frequency Integrated Circuit Design
- Radio Astronomy Observations and Technology
- Thermal Radiation and Cooling Technologies
- Terahertz technology and applications
- Photonic and Optical Devices
- Quantum and electron transport phenomena
- Antenna Design and Optimization
- Spectroscopy and Laser Applications
- Semiconductor Quantum Structures and Devices
- Advanced Frequency and Time Standards
- Astronomy and Astrophysical Research
- Superconductivity in MgB2 and Alloys
- Advanced Thermodynamic Systems and Engines
- Semiconductor materials and devices
- Advanced Semiconductor Detectors and Materials
- Scientific Research and Discoveries
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Calibration and Measurement Techniques
- Particle Detector Development and Performance
- Gyrotron and Vacuum Electronics Research
- Astrophysics and Star Formation Studies
Delft University of Technology
2016-2025
SRON Netherlands Institute for Space Research
2016-2025
University of Cologne
2025
North Carolina State University
2022
University of Groningen
1998-2016
Arizona State University
2016
Moscow State Pedagogical University
2015-2016
The University of Tokyo
2016
University of Cambridge
2015
Centre National de la Recherche Scientifique
2009
We find that stray infrared light from the 4 K stage in a cryostat can cause significant loss superconducting resonators and qubits. For devices shielded only metal box, we measured with quality factors Q = 10^5 qubits energy relaxation times T_1=120 ns, consistent light-induced quasiparticle density of 170-230 \mu m^{-3}. By adding second black shield at sample temperature, found about an order magnitude improvement performance no sensitivity to radiation. also tested various shielding...
We report the first demonstration of an all solid-state heterodyne receiver that can be used for high-resolution spectroscopy above 2THz suitable space-based observatories. The uses a NbN superconducting hot-electron bolometer as mixer and quantum cascade laser operating at 2.8THz local oscillator. measure double sideband noise temperature 1400K 4.2K, find free-running QCL has sufficient power stability practical receiver, demonstrating unprecedented combination sensitivity stability.
We have directly measured quasiparticle number fluctuations in a thin film superconducting Al resonator thermal equilibrium. The spectrum of these provides measure both the density and lifetime quasiparticles. observe that decreases exponentially with decreasing temperature, as theoretically predicted, but saturates below 160 mK to 25-55/μm(3). show this saturation is consistent lifetime, which also explains similar observations qubit decoherence times.
In a superconductor, absorption of photons with an energy below the superconducting gap leads to redistribution quasiparticles over and thus induces strong nonequilibrium quasiparticle distribution. We have measured electrodynamic response, quality factor, resonant frequency aluminium microwave resonator as function power temperature. Below 200 mK, both factor decrease increasing power, consistent creation excess due absorption. Counterintuitively, above increase power. demonstrate that...
In a superconductor, in which electrons are paired, the density of unpaired should become zero when approaching temperature. Therefore, radiation detectors based on breaking pairs promise supreme sensitivity, we demonstrate using an aluminium superconducting microwave resonator. Here show that resonator also enables study response electron system superconductor to pair-breaking photons, photons and varying temperatures. A large range power (at 1.54 THz) can be chosen by carefully filtering...
We report quality factors of up to 500×103 in superconducting resonators at the single photon levels needed for circuit quantum electrodynamics. This result is achieved by using NbTiN and removing dielectric from regions with high electric fields. As demonstrated a comparison Ta, crucial sources intensity-dependent loss are dielectrics on surface metal substrate.
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation S. J. C. Yates, A. Baselmans, Endo, R. M. Janssen, L. Ferrari, P. Diener, Baryshev; Photon noise limited radiation detection with lens-antenna coupled microwave kinetic inductance detectors. Appl. Phys. Lett. 15 August 2011; 99 (7): 073505. https://doi.org/10.1063/1.3624846 Download citation file: Ris (Zotero)...
Microwave Kinetic Inductance Detectors (MKIDs) are the most attractive radiation detectors for far-infrared and sub-mm astronomy: They combine ultimate sensitivity with possibility to create very large detector arrays, in excess of 10 000 pixels. This is possible by reading-out arrays using RF frequency division multiplexing, which allows multiplexing ratios 1000 pixels per readout line. We describe a novel system MKIDs, operating 2 GHz band 4-8 range. The readout, combination digital front-...
Future astrophysics and cosmic microwave background space missions operating in the far-infrared to millimetre part of spectrum will require very large arrays ultra-sensitive detectors combination with high multiplexing factors efficient low-noise low-power readout systems. We have developed a demonstrator system suitable for such applications. The combines 961 pixel imaging array based upon Microwave Kinetic Inductance Detectors (MKIDs) capable reading out all pixels simultaneously only one...
A pixel that can count individual photons and resolve each photon's color has been a dream for astronomers biophysicists. Dream no longer! The authors realize such detectors using superconducting microwave resonators. team experimentally shows spectral resolving power is strongly limited by photon energy escaping through phonon losses to the bath, early in detection process. With this insight, they use thin membrane demonstrate improved factor of 2.5, paving way reaching fundamental limit future.
We demonstrate that the performance of NbN lattice cooled hot electron bolometer mixers depends strongly on interface quality between and contact structure. show experimentally both receiver noise temperature gain bandwidth can be improved by more than a factor 2 cleaning adding an additional superconducting interlayer to pad. Using this we obtain double sideband TN,DSB=950 K at 2.5 THz 4.3 K, uncorrected for losses in optics. At same bias point, IF 6 GHz.
The quasiparticle relaxation time in superconducting films has been measured as a function of temperature using the response complex conductivity to photon flux. For tantalum and aluminum, chosen for their difference electron-phonon coupling strength, we find that at high temperatures increases with decreasing temperature, expected interaction. At low both materials saturation time, suggesting presence second channel not due
We study NbTiN resonators by measurements of the temperature dependent resonance frequency and noise. Additionally, are studied covered with SiOx dielectric layers various thicknesses. The develops a nonmonotonic dependence increasing layer thickness. increase in noise is independent thickness, demonstrating that not dominantly related to low deviations.
We demonstrate photon noise limited performance in both phase and amplitude readout microwave kinetic inductance detectors (MKIDs) consisting of NbTiN Al, down to 100 fW optical power. simulate the far field beam pattern lens-antenna system used couple radiation into MKID derive an aperture efficiency 75%. This is close theoretical maximum 80% for a single-moded detector. The patterns are verified by detailed analysis coupling within our measurement setup.
Uniformity in thickness and electronic properties of superconducting niobium titanium nitride (NbTiN) thin films is a critical issue for upscaling electronics, such as microwave kinetic inductance detectors submillimeter wave astronomy. In this article we make an experimental comparison between the uniformity NbTiN produced by two DC magnetron sputtering systems with vastly different target sizes: Nordiko 2000 equipped circular 100mm diameter target, Evatec LLS801 rectangular 127 mm x 444.5...
We present measurements and simulations of the polarization purity leaky lens-antenna coupled microwave Kinetic Inductance Detectors (KIDs) at 1.5 THz. find integrated cross-polarization level to be -21.5 dB for 1 f\#$\lambda$ spatial sampling. The agree well with theoretical description which is based on a combination in-transmission simulation antenna feed, an in-reception analysis antenna-KID system. Combined measured noise equivalent power 5--7$\times$10$^{-20}$ W/$\sqrt{\mathrm{Hz}}$,...
Low-loss deposited dielectrics are beneficial for the advancement of superconducting integrated circuits astronomy. In microwave band (approximately 1–10 GHz) dielectric loss at cryogenic temperatures and low electric field strengths is dominated by two-level systems. However, origin in millimeter-submillimeter 0.1–1 THz) not understood. We measured hydrogenated-amorphous-<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><a:mrow><a:mi>Si</a:mi><a:mi...
We developed, characterised, and verified an alignment method for the DESHIMA 2.0 instrument, ultra wide-band spectrometer operating between 200-400 GHz, at ASTE telescope. Due to ultra-wide bandwidth of 2.0, we require work across entire spectral range. Moreover, should be possible remotely, as on-site access is impractical. To fulfill these requirements mounted warm optics, consisting a modified Dragonian dual reflector system, on motor controlled hexapod. Crucial in procedure our sky...
This paper describes the combined Dutch efforts toward development of large wideband focal plane array receivers based on kinetic inductance detectors (KIDs). Taking into account strict electromagnetic and detector sensitivity requirements for future ground space observatories, this work has led to identification well-suited coupling strategies use lens antenna demonstration their feasibility. Moreover, some specific design difficulties that characterize KIDs-based designs have been...