A5075889410- Superconducting and THz Device Technology
- Physics of Superconductivity and Magnetism
- Terahertz technology and applications
- Microwave Engineering and Waveguides
- Radio Frequency Integrated Circuit Design
- Photonic and Optical Devices
- Quantum Information and Cryptography
- Spectroscopy and Laser Applications
- Particle Accelerators and Free-Electron Lasers
- Particle Detector Development and Performance
- Thermal Radiation and Cooling Technologies
- Gyrotron and Vacuum Electronics Research
- Semiconductor Quantum Structures and Devices
- Electromagnetic Compatibility and Noise Suppression
- Atmospheric Ozone and Climate
- Particle accelerators and beam dynamics
- Advanced MEMS and NEMS Technologies
- Advanced Fiber Laser Technologies
- Advanced Semiconductor Detectors and Materials
- Semiconductor materials and devices
- Superconducting Materials and Applications
- CCD and CMOS Imaging Sensors
- Advanced Frequency and Time Standards
- Acoustic Wave Resonator Technologies
- Quantum and electron transport phenomena
Karlsruhe Institute of Technology
2010-2020
Institut für Mikroelektronik- und Mechatronik-Systeme
2017-2018
Russian Quantum Center
2015
We demonstrate a 16-pixel array of microwave-current driven superconducting nanowire single-photon detectors with an integrated and scalable frequency-division multiplexing architecture, which reduces the required number bias readout lines to single microwave feed line. The electrical behavior photon-sensitive nanowires, embedded in resonant circuit, as well optical performance timing jitter is discussed. Besides pixel measurements, we also operation temporal, spatial, photon-number resolution.
We have investigated dielectric losses in amorphous silicon oxide (a-SiO) thin films under operating conditions of superconducting qubits (mK temperatures and low microwave powers). For this purpose, we developed a broadband measurement setup employing multiplexed lumped element resonators using power combiner low-noise amplifier. The measured temperature dependences the are good agreement with those predicted for atomic two-level tunneling systems (TLS). By measuring at different...
We present a new kind of rapid-single-flux-quantum (RSFQ) output driver together with pseudomorphic high electron mobility transistor (p-HEMT) amplifier both operating at liquid helium temperature. The passive interconnect including the interchip connection between RSFQ and first stage semiconductor is key element for signal matching was optimized minimizing reflections to circuit. based on single-flux-quantum dc converter voltage doubler. circuit realized in Niobium 1 kA/cm <sup...
The recording of coherent synchrotron radiation requires data acquisition systems with a temporal resolution tens picosecond. This paper describes new real-time and high-accuracy system suitable for individual ultra-short pulses generated by fast terahertz (THz) detector (e.g. YBCO, NbN, Zero Biased Schottky Diode). consists sampling board combined high throughput readout. first is designed the pulse signals full width half maximum (FWHM) between few to one hundred picoseconds minimum time 3...
We propose a new operation principle for superconducting nanowire single-photon detectors (SNSPDs) enabling an efficient frequency-division multiplexing of the bias and readout signals large multipixel detector array. The SNSPD is part resonant circuit, microwave signal inside device used to close critical state. Hence, n×m pixel array requires only two coaxial cables from room temperature ambient 4.2 K. show characterization response such devices compare efficiencies with conventional...
In order to improve the frequency-division multiplexing (FDM) in transition edge sensor (TES) imaging arrays, it is suggested replace commonly used SQUID amplifiers with a semiconductor high-frequency cooled amplifier. This would result single 10-GHz bandwidth amplifier serving array of more than 1000 detectors. The basic idea implement an antenna-coupled TES as load for high- <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Q</i> resonator, weakly...
In this paper a new analytical model about the calculation of resonance frequencies and bandwidth log-periodic planar antennas is proposed. The two previous known models our novel are compared to numerical simulations experimental measurements. theoretical part calculations opposed results reflection parameter simulations. Our shows very good coincidence according number position frequencies. We show that not case for models. For validation several devices with different geometries were...
We report the time-domain analysis of fast pulses emitted by a quantum cascade laser (QCL) operating at ~ 3.1 THz using superconducting detectors made from either NbN or YBa <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Cu xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">7-δ</sub> (YBCO) thin films. The ultrafast response these allows resolution emission features occurring on nanosecond...
The behavior of submicrometer-sized thin-film <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="TeX">$\hbox{YBa}_{2}\hbox{Cu}_{3}\hbox{O}_{7-{\rm x}}$</tex-math></inline-formula> (YBCO) detectors under illumination with picosecond terahertz (THz) pulses was investigated. Real-time measurements a temporal resolution 15 ps full width at half maximum were performed ANKA, the synchrotron facility Karlsruhe Institute...
The use of a transmission line resonator offers the possibility for different sensor readout methods, e.g. flux qubit and kinetic inductance detectors. Both cases require high quality factor, QL, cavity circuit to detect small deviations in resonance frequency.
The connection of RSFQ circuits with commercial room temperature electronics and amplifying SFQ pulses high data rates require cryogenic interface amplifiers. Such amplifiers should provide extremely bandwidth, low noise power consumption at the same time. Various hybrid based on p-HEMT transistors in an embedded microwave design were designed characterized. Towards transistor characterization biasing settings according to optimum between voltage gain determined. Thus a total 2 mW 12 dB per...
The concept of the radio-frequency superconducting nanowire single-photon detector (RF-SNSPD) allows frequency-division multiplexing (FDM) bias and readout lines several SNSPDs. Using this method, a multi-pixel array can be operated by only one feed line. Consequently, system complexity as well heat load is significantly reduced. To allocate many pixels into small bandwidth quality factor each device crucial. In paper, we present an improved RF-SNSPD design. This new design enables simple...
The development of large multi-pixel detector applications with lumped element kinetic inductance detectors (LEKID) requires a detailed knowledge about the mode operation in respect microwave regime. In this paper basic properties LEKID structures for at liquid helium temperatures were investigated. consideration temperature, different behavior coupled to microstrip and coplanar strip readout transmission lines, e.g. loaded unloaded quality factors, have been examined. For purpose several...
High-resolution applications demand a strong increase in number of pixels detector arrays. In terms the lumped-element kinetic inductance detector, this requires detailed knowledge microwave properties each single pixel; moreover, unwanted interaction (cross-talk) between them has to be examined and eliminated. paper, basic structures were investigated. Simulations demonstrate influence embedding design parameters, e.g., orientation coupling distances, respect behavior. addition, different...
Different terrestrial terahertz applications would benefit from large-format arrays, operating in compact and inexpensive cryocoolers at liquid helium temperature with sensitivity, limited only by the 300-K background radiation. A voltage-biased transition-edge sensor (TES) as a THz detector can have sufficient sensitivity has number of advantages important for real applications: linearity response, high dynamic range, simple calibration. However, it requires low-noise current readout....
We present a compact current sensor based on superconducting microwave lumped-element resonator with nanowire kinetic inductor, operating at 4.2 K. The is suitable for multiplexed readout in GHz range large-format arrays of cryogenic detectors. device consists resonant circuit, fabricated from single 4 nm-thick layer niobium nitride. Thus, the fabrication and operation significantly simplified comparison to state-of-the-art approaches. Because circuit inductively coupled feed line be...
To improve both scalability and noise-filtering capability of a transition-edge sensor (TES), new concept thin-film detector is suggested, which based on embedding microbridge TES into high-Q planar GHz-range resonator weakly coupled to 50-Ω-readout transmission line. Such element designed as hot-electron microbolometer THz-range antenna load the at same time. A weak THz signal heats TES, thus reducing quality factor leading power increment in readout The power-to-power conversion gain, an...
The sensitivity of a kinetic inductance detector is determined by the performance cavity circuit and therefore high quality factor low phase noise are required. We developed superconducting niobium coplanar waveguide resonators for detectors at resonance frequency 6 GHz. length adjusted to quarter wavelength which corresponds ≈ 5.3 mm in our geometry. Different layouts with transmission line topology resonator were designed simulated. Some parameters device fabrication process varied. thin...
The commissioning of a new real-time and high-accuracy data acquisition system suitable for recording individual ultra-short coherent pulses detected by fast terahertz detectors will be presented. is able to monitor turn-by-turn all buckets in streaming mode. main board consists direct sampling operating with minimum time 3 psec jitter less than 1.7 psec. very low noise layout design combined wide dynamic range bandwidth the analog front-end allows sample pulse signals generated various...
Cryogenic bolometers based on thin silicon nitride membranes show a very high sensitivity, which makes them ideal for ultrasensitive detector applications, particularly in the field of submillimeter-wave imaging. For that, transition-edge sensors (TESs) have been established as viable approach toward developing multipixel sensor arrays. However, current multiplexer techniques time- or code-division multiplexing do not scale well to levels several hundred detectors per channel. To achieve...
By using LEKIDs the prospect rises to multi-pixel arrays with an extremely small footprint. Moreover, these have advantage of frequency-division multiplex readout method (FDM). However, increase packing density leads crosstalk between adjacent pixels and complicates process significantly. In this paper, we present a newly developed LEKID structure reduced their improved performance in terms equally spaced resonance frequencies within array. Thus, array can be realized large number analog...
One of the most promising sources for pulsed terahertz (THz) radiation is coherent synchrotron (CSR). Due to their response time in picosecond range, direct THz detectors based on YBa <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Cu xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">7-x</sub> hot-electron bolometers are ideally suited analysis electron-beam instabilities occurring storage...
Detectors made from the high-T <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> superconductor YBa xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Cu xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">7-x</sub> are well suited to detect high-intensity pulsed-terahertz (THz) radiation emitted by synchrotron light sources and free-electron lasers due their fast response times. We propose a...
There is a great deal of interest in amplifiers with extremely high bandwidth, low noise and power consumption which interface RSFQ circuits commercial room temperature electronics or amplifying SFQ pulses. In this special application hybrid amplifier should an circuitry Josephson junction array quantizer chip (JA-Q) at 4.2 K. The input signal for the generated by generator output fed-in to quantizer. A voltage gain about 104 pattern frequency 2 GHz good transfer pulses required....
Superconducting transmission line resonators can be used to read out different sensors, e.g. flux qubit, transition edge sensor, or as detection element in kinetic inductance detectors. For both applications, high loaded quality factors of the microwave are required, so that it is possible detect small deviations their resonance frequency. Thus lead a sensitive readout.