A plasmonic analogue of electromagnetically induced transparency is activated and tuned in the terahertz (THz) range asymmetric metamaterials fabricated from high critical temperature (Tc) superconductor thin films. The design provides a near-field coupling between superradiant subradiant mode, which has been widely through superconductivity monitored by Fourier transform infrared spectroscopy. sharp window that appears extinction spectrum exhibits relative modulation up to 50% change....

We report on the fabrication and characterization of superconducting magnesium diboride (MgB2) thin films intended for quantum-limited devices based non-linear kinetic inductance (NLKI) such as parametric amplifiers with either elevated operating temperatures or expanded frequency ranges. In order to characterize MgB2 material properties, we have fabricated coplanar waveguide (CPW) transmission lines microwave resonators using ≈40 nm thick a measured ∼5.5 pH/□ internal quality factors...

Passive imaging through optical obscurants is a promising application for mm-wave sensing. We have thus developed the Superconducting Kinetic Inductance Radiometer (SKIPR), 150 GHz polarization-sensitive photometric camera optimized terrestrial using focal plane array with 3,840 kinetic inductance detectors (KIDs). present full description of instrument design, particular emphasis on cryogenic system based Gifford-McMahon cryocooler two-stage Adiabatic Demagnetization Refrigerator and...

Passive imaging through optical obscurants is a promising application for mm-wave sensing. We have thus developed the Superconducting Kinetic Inductance Radiometer (SKIPR), 150 GHz polarization-sensitive photometric camera optimized terrestrial using focal plane array with 3840 kinetic inductance detectors (KIDs). present full description of instrument design, particular emphasis on cryogenic system based Gifford–McMahon cryocooler two-stage adiabatic demagnetization refrigerator and...

Hot-Electron Bolometer (HEB) mixers have proven to be the best tool for high-resolution spectroscopy at Terahertz frequencies. However, current state of art NbN suffer from a small intermediate frequency (IF) bandwidth as well low operating temperature. MgB <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> is promising material HEB mixer technology in view its high critical temperature and fast thermal relaxation allowing large IF...

Local oscillator sources have become a major technological deficit approaching the terahertz frequencies. For applications, where narrow linewidth is necessary, such as coherent remote sensing, best solution to signal generation frequency multiplication, phase locking can be easily achieved using fundamental source. We present an alternative existing multiplier technologies for cryogenic applications. The device superconducting waveguide that has kinetic inductance dependent on rf current...

Progress in superconducting device and detector technologies over the past decade has realized practical applications quantum computers, detectors for far-infrared telescopes, optical communications. Superconducting thin-film materials, however, have remained largely unchanged, with aluminum still being material of choice qubits niobium compounds high-frequency/high kinetic inductance devices. Magnesium diboride (MgB

The penetration depth of MgB2 was measured using two methods different mechanisms. first method used Josephson junctions and the magnetic field dependence junction critical current. second deduced from inductance a microstrip to modulate voltage DC SQUID. showed consistent value low-temperature for be about 40 nm. Both small its temperature are in agreement with microscopic theory clean limit.

Hot-electron bolometer mixers employing thin films of conventional superconducting materials have already been successfully fabricated in the past. Magnesium diboride (MgB <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ) is a promising alternative to superconductors, and we report fabrication study ultrathin MgB down 10 nm deposited by hybrid physical-chemical vapor deposition technique. The showed T...

The Next-generation Extended Wavelength-MUltiband Sub/millimeter Inductance Camera (NEW-MUSIC) on the Leighton Chajnantor Telescope (LCT) will be a first-of-its-kind, six-band, transmillimeter-wave ("trans-mm") polarimeter covering 2.4 octaves of spectral bandwidth to open new window trans-mm time-domain frontier, in particular frontiers energy, density, time, and magnetic field. NEW-MUSIC's broad coverage also enable use Sunyaev-Zeldovich effects study accretion, feedback, dust content hot...

Terahertz high-resolution spectroscopy of interstellar molecular clouds greatly relies on hot-electron superconducting bolometric (HEB) mixers. Current state-of-the-art receivers use mixer devices made from ultrathin (~ 3-5 nm) films NbN with critical temperature ~ 9-11 K. Such mixers have been deployed a number groundbased, suborbital, and orbital platforms including the HIFI instrument Hershel Space Observatory. Despite its good sensitivity well-established fabrication process, HEB suffers...

We report planar-type MgB2 DC SQUIDs fabricated using a multilayer process. The employed sandwich-type MgB2/MgO/MgB2 Josephson junctions and wiring layer. showed large voltage modulation above 500 μV at 15 K operated in broad temperature range from to 37 with transfer function as high 2.3 mV/Φ0. minimum SQUID noise was measured 26 cryocooler, yielding white around 10 μΦ0/Hz1/2 1/f corner frequency near Hz. result demonstrates great promise of for practical applications.

Hot-electron bolometers (HEBs) made with MgB <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> have proven to a large intermediate frequency and shown potential for low noise into the terahertz range. Although practical results from these mixers been achieved fairly quickly, effort is still needed realize an HEB improved sensitivity compete state-of-the-art mixers. Here, we present of our mixer work achieve HEBs based on hybrid physical...

Using self-shunted MgB2/MgO/MgB2 Josephson junctions, we have designed, fabricated, and tested a rapid single flux quantum toggle flip flop (TFF) circuit. The junctions used MgB2 films grown by hybrid physical-chemical vapor deposition with MgO barrier layer insulating deposited RF magnetron sputtering. result showed the frequency-division function of TFF circuit, evidenced output voltage being half input voltage, up to 63 GHz at 20 K 180 3.2 K, which demonstrates potential high operating...

The potential applications for high frequency operation of the Josephson effect in MgB2 include THz mixers, direct detectors, and digital circuits. Here we report on weak links which exhibit behavior up to almost 2 using them low-noise heterodyne detection radiation. devices are made from epitaxial film grown c-axis direction by hybrid physical-chemical vapor deposition method. current junctions travels parallel surface film, thus making possible a large contribution quasi-two-dimensional...

We developed superconducting kinetic inductance bolometers (KIBs) for hyperspectral imaging in outer solar system missions. Each bolometer is a microwave L-C resonator that will act as an individual pixel the focal plane of Fourier transform infrared spectrometer. Our devices are fabricated from high temperature superconductor yttrium barium copper oxide (YBCO), with transition ∼85 K. The inductors suspended on thin Si3N4 membranes. operates at unique resonant frequency, and hence, many can...

Sandwich-type MgB <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> /MgO/MgB Josephson junctions with sizes ranging from 0.5 μm × to 10 were fabricated using electron beam lithography. The show critical current densities as high 130 kA/cm <sup xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . smallest of the operated free hysteresis below 4.2 K. They may be ideal for use in rapid single flux quantum circuits no requirement external...

In order to realize superconducting circuits using MgB <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> , an in-depth study was conducted generate a baseline of parameters necessary for circuit design. With transition temperature ( <i xmlns:xlink="http://www.w3.org/1999/xlink">T</i> xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> ) 39 K, devices and can be made operate at low temperatures achieve higher operating frequencies, high...

We present results of sandwich-type MgB2/TiB2/MgB2 superconductor–normal metal–superconductor Josephson junctions with MgB2 films grown by hybrid physical–chemical vapor deposition and TiB2 barriers, between 5 10 nm in thickness, DC magnetron sputtering. Most an 8 or thicker barrier showed little excess current no subgap features can be described the resistively-shunted-junction model. Meanwhile prominent multiple Andreev reflection characteristics such as currents peaks were observed some...

We report on the growth of high quality MgB2 thin films silicon and silicon-on-insulator substrates by hybrid physical chemical vapor deposition. A boron buffer layer was deposited all sides Si substrate to prevent reaction Mg Si. Ar ion milling at a low angle 1° used reduce roughness before growth. An also applied surface its roughness. The resultant showed excellent superconducting properties smooth surface. process produces suitable for waveguide-based hot electron bolometers other...

The exploration of superconductivity in ultrathin films has attracted much attention the past decades for device applications such as hot electron bolometers (HEBs) and superconducting nanowire single photon detectors (SNSPDs). With a critical temperature (Tc) 39 K, which is far above that other conventional Bardeen-Cooper-Schrieffer (BCS) superconductors, its faster thermal response, MgB 2 present promising alternative use HEBs SSNPDs. In this paper, we results on MgB2 grown by hybrid...

Ultrathin superconducting MgB <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> films are desirable for device applications and exploration of new quantum phenomena in reduced dimensions. We have reported recently that smooth ultrathin can be grown on carbon-terminated SiC substrates using Hybrid Physical-Chemical Vapor Deposition (HPCVD). In this work, we present a thickness dependence study HPCVD-grown C-terminated with focus the...

The current-voltage and conductance-voltage characteristics of MgB2/MgO/MgB2 junctions made with MgB2 electrodes grown by hybrid physical-chemical vapor deposition were systematically analyzed. In the different sizes critical current densities, we found excess subharmonic gap structure indicative multiple Andreev reflection. An apparent link between reflection substantial Josephson at high temperatures suggests that barrier is dominated high-transparency channels.

Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text A. E. Velasco, D. P. Cunnane, N. Acharya, R. Briggs, Beyer, M. Shaw, B. S. Karasik, Wolak, X. Xi, and F. Marsili, "High-Operating-Temperature Superconducting Nanowire Single Photon Detectors," in Conference Lasers Electro-Optics, OSA Technical Digest (online) (Optica Publishing Group, 2016), paper FW4C.5. Export BibTex Endnote (RIS) HTML Plain alert Save article

We present Josephson junctions fabricated from high transition temperature superconductor 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</sub> coupled to spiral THz antennas. The fabrication process involves creating a junction at the center of superconducting bridge embedded into antenna using irradiation focused helium ion beam....