A5071107298- Superconducting and THz Device Technology
- Stellar, planetary, and galactic studies
- Physics of Superconductivity and Magnetism
- Adaptive optics and wavefront sensing
- Astronomy and Astrophysical Research
- Radio Frequency Integrated Circuit Design
- Radio Astronomy Observations and Technology
- Thermal Radiation and Cooling Technologies
- Calibration and Measurement Techniques
- Microwave Engineering and Waveguides
- Astrophysics and Star Formation Studies
- Advanced Frequency and Time Standards
- Semiconductor Quantum Structures and Devices
- Terahertz technology and applications
- Pulsars and Gravitational Waves Research
- Superconductivity in MgB2 and Alloys
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Antenna Design and Optimization
- Particle accelerators and beam dynamics
- Astronomical Observations and Instrumentation
- Galaxies: Formation, Evolution, Phenomena
- Photonic and Optical Devices
- Quantum Information and Cryptography
- Advanced Semiconductor Detectors and Materials
University of California, Santa Barbara
2015-2024
Jet Propulsion Laboratory
2006-2020
Dominican School of Philosophy and Theology
2020
Fermi National Accelerator Laboratory
2020
University of Arizona
2018
National Astronomical Observatory of Japan
2016
University of California System
2011
California Institute of Technology
2002-2010
National Institute of Standards and Technology
2009-2010
University of Colorado Boulder
2009
We present measurements of the temperature-dependent frequency shift five niobium superconducting coplanar waveguide microresonators with center strip widths ranging from 3to50μm, taken at temperatures in range 100–800mK, far below 9.2K transition temperature niobium. These data agree well two-level system (TLS) theory. Fits to this theory provide information on number TLSs that interact each resonator geometry. The geometrical scaling indicates a surface distribution and are consistent TLS...
Titanium nitride (TiNx) films are ideal for use in superconducting microresonator detectors because: a) the critical temperature varies with composition (0 < Tc 5 K); b) normal-state resistivity is large, \rho_n ~ 100 $\mu$Ohm cm, facilitating efficient photon absorption and providing a large kinetic inductance detector responsivity; c) TiN very hard mechanically robust. Resonators using reactively sputtered show remarkably low loss (Q_i > 10^7) have noise properties similar to resonators...
We present the design, construction, and commissioning results of ARCONS, Array Camera for Optical to Near-IR Spectrophotometry. ARCONS is first ground-based instrument in optical through near-IR wavelength range based on Microwave Kinetic Inductance Detectors (MKIDs). MKIDs are revolutionary cryogenic detectors, capable detecting single photons measuring their energy without filters or gratings, similar an X-ray microcalorimeter. nearly ideal, noiseless photon as they do not suffer from...
Microwave Kinetic Inductance Detectors, or MKIDs, have proven to be a powerful cryogenic detector technology due their sensitivity and the ease with which they can multiplexed into large arrays. A MKID is an energy sensor based on photon-variable superconducting inductance in lithographed microresonator, capable of functioning as photon across electromagnetic spectrum well particle detector. Here we describe first successful effort create photon-counting, energy-resolving ultraviolet,...
Microwave kinetic inductance detectors (MKIDs) are superconducting capable of counting single photons and measuring their energy in the UV, optical, near-IR. MKIDs feature intrinsic frequency domain multiplexing (FDM) at microwave frequencies, allowing construction readout large arrays. Due to FDM, do not require complex cryogenic electronics used for similar detectors, such as transition edge sensors, but instead transfer this complexity room temperature where they present a formidable...
Photonics offer numerous functionalities that can be used to realize astrophotonic instruments. The most spectacular example date is the ESO Gravity instrument at Very Large Telescope in Chile. Integrated devices stand critical advantages for development, including extreme miniaturization, as well integration, superior thermal and mechanical stabilization owing small footprint, high replicability offering cost savings. Numerous technologies have been developed address shortcomings of...
We have measured noise in thin-film superconducting coplanar waveguide resonators. This appears entirely as phase noise, equivalent to a jitter of the resonance frequency. In contrast, amplitude fluctuations are not observed at sensitivity our measurement. The ratio between power and directions is large, excess 30 dB. These results important implications for resonant readouts various devices such detectors, amplifiers, qubits. suggest that due two-level systems dielectric materials.
We present measurements of the low-temperature excess frequency noise four niobium superconducting coplanar waveguide microresonators, with center strip widths sr ranging from 3to20μm. For a fixed internal power, we find that decreases rapidly increasing width, scaling as 1∕sr1.6. show this geometrical is readily explained by simple semiempirical model which assumes surface distribution independent two-level system fluctuators. These results allow resonator geometry to be optimized for minimum noise.
We present a systematic study of the properties room temperature deposited TiN films by varying deposition conditions in an ultra-high-vacuum reactive magnetron sputtering chamber. By increasing pressure from 2 to 9 mTorr while keeping nearly stoichiometric composition Ti1−xNx (x = 0.5) without substrate heating, film resistivity increases, dominant crystal orientation changes (100) (111), grain boundaries become clearer, and strong compressive in-plane strain weak tensile strain. The absorb...
We have fabricated and characterized 10,000 20,440 pixel Microwave Kinetic Inductance Detector (MKID) arrays for the Dark-speckle Near-IR Energy-resolved Superconducting Spectrophotometer (DARKNESS) MKID Exoplanet Camera (MEC). These instruments are designed to sit behind adaptive optics systems with goal of directly imaging exoplanets in a 800-1400 nm band. Previous large optical near-IR were using substoichiometric titanium nitride (TiN) on silicon substrate. arrays, however, suffered from...
The energy resolution of a single photon counting Microwave Kinetic Inductance Detector (MKID) can be degraded by noise coming from the primary low temperature amplifier in detector's readout system. Until recently, quantum limited amplifiers have been incompatible with these detectors due to dynamic range, power, and bandwidth constraints. However, we show that kinetic inductance based traveling wave parametric used for this application reaches limit. total system scheme was equal ~2.1...
We present the MKID Exoplanet Camera (MEC), a z through J band (800–1400 nm) integral field spectrograph located behind The Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) at Telescope on Maunakea that utilizes Microwave Kinetic Inductance Detectors (MKIDs) as enabling technology for high contrast imaging. MEC is first permanently deployed near-infrared instrument and designed to operate both an IFU, focal plane wavefront sensor in multi-kHz feedback loop with SCExAO. read noise free,...
We demonstrate single-photon counting at 1550 nm with titanium-nitride (TiN) microwave kinetic inductance detectors. Energy resolution of 0.4 eV and arrival-time 1.2 microseconds are achieved. 0-, 1-, 2-photon events resolved shown to follow Poisson statistics. find that the temperature-dependent frequency shift deviates from Mattis-Bardeen theory, dissipation response shows a shorter decay time than low temperatures. suggest observed anomalous electrodynamics may be related quasiparticle...
MagAO-X is an entirely new extreme adaptive optics system for the Magellan Clay 6.5 m telescope, funded by NSF MRI program starting in Sep 2016. The key science goal of high-contrast imaging accreting protoplanets at Hα. With 2040 actuators operating up to 3630 Hz, will deliver high Strehls (> 70%), resolution (19 mas), and contrast (< 1 × 10<sup>-4 </sup>) Hα (656 nm). We present overview system, review design, discuss current project status.
Microwave kinetic inductance detectors (MKIDs) sensitive to light in the ultraviolet near-infrared wavelengths are superconducting microresonators that capable of measuring photon arrival times microsecond precision and estimating each photon's energy. The resolving power nonmembrane MKIDs has remained stubbornly around 10 at 1 μm despite significant improvements system noise. Here we show can be roughly doubled with a simple bilayer design without needing place device on membrane, avoiding...
The surface impedance of a superconductor changes when energy is absorbed and Cooper pairs are broken to produce single electron (quasiparticle) excitations. This change may be sensitively measured using thin-film resonant circuit called microwave kinetic inductance detector (MKID). practical application MKIDs for photon detection requires method efficiently coupling the MKID. We present results on position sensitive X-ray detectors made by two aluminum either side tantalum absorber strip....
Microwave Kinetic Inductance Detectors, or MKIDs, are non‐equilibrium superconducting detectors made out of high quality factor microwave resonant circuits. Their primary advantage over other low temperature detector technologies is their built‐in frequency domain multiplexing at GHz frequencies, allowing thousands to be read through a single transmission line. MKIDs now celebrating tenth birthday, so this review aims sum up what has been learned the first decade and explore diversity...
Noise performance is one of the most crucial aspects any detector. Superconducting Microwave Kinetic Inductance Detectors (MKIDs) have an "excess" frequency noise that shows up as a small time dependent jitter resonance characterized by power spectrum measured in units Hz^2/Hz. Recent studies shown this almost certainly originates from surface layer two-level system (TLS) defects on metallization or substrate. Fluctuation these TLSs introduces resonator due to coupling TLS electric dipole...
For X-ray imaging spectroscopy, high spatial resolution over a large field of view is often as important energy resolution, but current detectors do not provide both in the same device. Thermal Kinetic Inductance Detectors (TKIDs) are being developed they offer feasible way to combine transition edge sensors with pixel counts approaching CCDs and thus promise significant improvements for many spectroscopy applications. TKIDs variation Microwave (MKIDs) share their multiplexibility: working...
We present DARKNESS (the DARK-speckle Near-infrared Energy-resolving Superconducting Spectrophotometer), the first of several planned integral field spectrographs to use optical/near-infrared Microwave Kinetic Inductance Detectors (MKIDs) for high-contrast imaging. The photon counting and simultaneous low-resolution spectroscopy provided by MKIDs will enable real-time speckle control techniques post-processing suppression at framerates capable resolving atmospheric speckles that currently...
Abstract We report the direct imaging discovery of a low-mass companion to nearby accelerating A star, HIP 109427, with Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) instrument coupled Microwave Kinetic Inductance Detector Exoplanet Camera (MEC) and CHARIS integral field spectrograph. data reduced reference star point spread function (PSF) subtraction yield 1.1–2.4 μ m spectra. MEC reveals in Y J band at comparable signal-to-noise ratio using stochastic speckle discrimination, no PSF...
Brown dwarfs with well-measured masses, ages and luminosities provide direct benchmark tests of substellar formation evolutionary models. We report the first results from a imaging survey aiming to find characterize companions nearby accelerating stars assistance Hipparcos-Gaia Catalog Accelerations (HGCA). In this paper, we present joint high-contrast astrometric discovery companion HD 176535 A, K3.5V main-sequence star aged approximately $3.59_{-1.15}^{+0.87}$ Gyrs at distance $36.99 \pm...