A5077823749- Superconducting and THz Device Technology
- Microwave Engineering and Waveguides
- Physics of Superconductivity and Magnetism
- Radio Frequency Integrated Circuit Design
- Photonic and Optical Devices
- Magnetic confinement fusion research
- Terahertz technology and applications
- Particle accelerators and beam dynamics
- Radio Astronomy Observations and Technology
- Gyrotron and Vacuum Electronics Research
- Thermal Radiation and Cooling Technologies
- Semiconductor Quantum Structures and Devices
- Advanced Thermodynamic Systems and Engines
- Superconducting Materials and Applications
- Spectroscopy and Laser Applications
- Atomic and Subatomic Physics Research
- Quantum and electron transport phenomena
- Advanced Frequency and Time Standards
- Plasma Diagnostics and Applications
- Antenna Design and Optimization
- Semiconductor materials and devices
- Advancements in Semiconductor Devices and Circuit Design
- Ionosphere and magnetosphere dynamics
- Optical Coatings and Gratings
- Quantum Computing Algorithms and Architecture
Delft University of Technology
2013-2024
SRON Netherlands Institute for Space Research
2016-2024
Leiden University
2024
Tohoku University
2024
Kavli Institute for Theoretical Sciences
2017
Arizona State University
2016
The University of Tokyo
2016
University of Groningen
2016
Moscow State Pedagogical University
2016
Institute for Atomic and Molecular Physics
2008-2011
The quantum Rabi model describing the fundamental interaction between light and matter is a cornerstone of physics. It predicts exotic phenomena like phase transitions ground-state entanglement in ultrastrong-coupling (USC) regime, where coupling strengths are comparable to subsystem energies. Despite progress many experimental platforms, few experiments reaching USC have been limited spectroscopy: demonstrating dynamics remains an outstanding challenge. Here, we employ circuit QED chip with...
In tokamak plasmas with a tearing mode, strong scattering of high power millimeter waves, as used for heating and noninductive current drive, is shown to occur. This new wave phenomenon be related the passage $O$ point magnetic island through beam. The density determines detailed phasing scattered radiation relative $O$-point passage. depends strongly nonlinearly on beam power.
We study spin relaxation and diffusion in an electron-spin ensemble of nitrogen impurities diamond at low temperature (0.25-1.2 K) polarizing magnetic field (80-300 mT). Measurements exploit field-controlled coupling the to two modes a transmission-line resonator. The observed temperature-independent time indicates that outdiffusion across mode volume dominates over spin-lattice relaxation. Depolarization one hyperfine-split subensemble by pumping another fast cross relaxation, with...
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.
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...
The idea that preformed Cooper pairs could exist in a superconductor above its zero-resistance state has been explored for unconventional, interface, and disordered superconductors, yet direct experimental evidence is lacking. Here, we use scanning tunneling noise spectroscopy to unambiguously show up temperatures much higher than the critical temperature $T_{C}$ titanium nitride, by observing clear enhancement shot equivalent change of effective charge from 1 2 electron charges. We further...
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/$\sqrt{\mathrm{Hz}}$,...
Terahertz spectrometers with a wide instantaneous frequency coverage for passive remote sensing are enormously attractive many terahertz applications, such as astronomy, atmospheric science, and security. Here we demonstrate wide-band spectrometer based on single superconducting chip. The chip consists of an antenna coupled to transmission line filterbank, microwave kinetic inductance detector behind each filter. Using division multiplexing, all detectors read-out simultaneously, creating...
Aims . Future actively cooled space-borne observatories for the far-infrared, loosely defined as a 1–10 THz band, can potentially reach sensitivity limited only by background radiation from Universe. This will result in an increase observing speed of many orders magnitude. A spectroscopic instrument on such observatory requires large arrays detectors with expressed noise equivalent power NEP = 3 × 10 −20 W/√Hz. Methods We present design, fabrication, and characterisation microwave kinetic...
The stability and performance of tokamak plasmas are limited by instabilities such as neoclassical tearing modes. This paper reports on an experimental proof principle a feedback control approach for real-time, autonomous suppression stabilization modes in tokamak. system combines electron cyclotron emission diagnostic sensing the same sight line with steerable resonance heating current drive (ECRH/ECCD) antenna. A methodology fast detection q = m/n 2/1 retrieval their location, rotation...
Kinetic inductance detectors (KIDs) are superconducting energy-resolving detectors, sensitive to single photons from the near-infrared ultraviolet. We study a hybrid KID design consisting of $\ensuremath{\beta}$-phase tantalum ($\ensuremath{\beta}$-$\mathrm{Ta}$) inductor and $\mathrm{Nb}\text{\ensuremath{-}}\mathrm{Ti}\text{\ensuremath{-}}\mathrm{N}$ interdigitated capacitor. The devices show an average intrinsic quality factor ${Q}_{i}$...
An electron cyclotron emission (ECE) receiver inside the resonance heating (ECRH) transmission line has been brought into operation. The ECE is extracted by placing a quartz plate acting as Fabry-Perot interferometer under an angle wave (ECW) beam. measurements are obtained during high power ECRH This demonstrates successful operation of diagnostic and, in particular, sufficient suppression gyrotron component preventing it from interfering with measurements. When integrated feedback system...
We experimentally demonstrate the principle of an on-chip submillimeter wave filter bank spectrometer, using superconducting microresonators as narrow band-separation filters. The filters are made NbTiN/SiNx/NbTiN microstrip line resonators, which have a resonance frequency in range 614-685 GHz, two orders magnitude higher than what is currently studied for use circuit quantum electrodynamics and photodetectors. resolution decreases from 350 to 140 with increasing frequency, most likely...
Next generation sub-mm imaging instruments require kilo-pixel focal plane arrays filled with background limited detectors. Microwave kinetic inductance detectors (MKIDs) are a state-of-the-art detector for future due to their inherent multiplexing capabilities. An MKID consists of superconducting resonator coupled feed-line that is used readout. In the device presented here radiation coupling achieved by directly planar antenna. The antenna placed in focus an extended hemispherical lens...
For space observatories, the glitches caused by high energy phonons created interaction of cosmic ray particles with detector substrate lead to dead time during observation. Mitigating impact rays is therefore an important requirement for detectors be used in future missions. In order investigate possible solutions, we carry out a systematic study testing four large arrays Microwave Kinetic Inductance Detectors (MKIDs), each consisting $\sim$960 pixels and fabricated on monolithic 55 mm...
Parallel-plate capacitors (PPC) significantly reduce the size of superconducting microwave resonators, reducing pixel pitch for arrays single-photon energy-resolving kinetic inductance detectors (KIDs). The frequency noise KIDs is typically limited by tunneling two-level systems (TLS), which originate from lattice defects in dielectric materials required PPCs. How level depends on PPC's dimensions has not been experimentally addressed. We measure 56 resonators with...
Distant, dusty and extremely luminous galaxies form a key component of the high redshift universe, tracing period intense cosmic activity that ultimately gave rise to present-day universe. These highly galaxies, first detected in ground-based submillimeter region, are however optically very faint, which hampers identification optical counterpart measurement redshift. We developing new direct-detection submm spectrograph DESHIMA. By taking advantage rapidly advancing technology...
We present the design, fabrication, and full characterisation (sensitivity, beam pattern, frequency response) of a background limited broadband antenna coupled kinetic inductance detector covering range from 1.4 to 2.8 THz. This device shows photon noise performance with equivalent power 2.5 × 10−19 W/Hz1∕2 at 1.55 THz can be easily scaled kilo-pixel array. The measured optical efficiency, response match very well simulations.
Large ultrasensitive detector arrays are needed for present and future observatories far infrared, submillimeter wave (THz), millimeter astronomy. With increasing array size, itis increasingly important to control stray radiation inside the chips themselves, surface wave. We demonstrate this effect with focal plane of 880 lens-antenna coupled microwave kinetic inductance detectors (MKIDs). Presented here near field measurements MKID optical response versus position on a reimaged source. that...
The superconducting critical temperature (Tc > 15K) of niobium titanium nitride (NbTiN) thin films allows for low-loss circuits up to 1.1 THz, enabling on-chip spectroscopy and multi-pixel imaging with advanced detectors. drive large scale detector microchips is demanding NbTiN uniform properties over an increasingly larger area. This article provides experimental comparison between two reactive d.c. sputter systems different target sizes: a small (100mm diameter) (127 mm x 444.5 mm)....
This paper presents the fabrication and electrical characterization of superconducting high-aspect ratio through-silicon vias DC-sputtered with aluminum. Fully conformal void-free coating 300 μm-deep 50 μm-wide Al, a CMOS-compatible widely available superconductor, was made possible by tailoring funneled sidewall profile for axisymmetric vias. Single-via electric resistance as low 80.44 mQ at room temperature superconductivity below 1.28 K were measured cross-bridge Kelvin resistor...
We present a lab-on-chip technique to measure the very low losses in superconducting transmission lines at (sub-) mm wavelengths. The chips consist of 100 nm-thick NbTiN Co-planar Waveguide (CPW) Fabry–Pérot (FP) resonator, coupled, on one side, an antenna and, other Microwave Kinetic Inductance detector. Using single frequency radiation source allows us response FP around 350 GHz and deduce its losses. show that loss is dominated by inside CPW line forms it decreases with decreasing...