A5042434167- Graphene research and applications
- Superconducting and THz Device Technology
- Thermal properties of materials
- Thermal Radiation and Cooling Technologies
- Physics of Superconductivity and Magnetism
- Advanced Semiconductor Detectors and Materials
- Photonic and Optical Devices
- GaN-based semiconductor devices and materials
- Carbon Nanotubes in Composites
- Quantum and electron transport phenomena
- Spectroscopy and Laser Applications
- Quantum Information and Cryptography
- Cold Atom Physics and Bose-Einstein Condensates
- Molecular Junctions and Nanostructures
- Surface and Thin Film Phenomena
- Semiconductor Quantum Structures and Devices
- Electron and X-Ray Spectroscopy Techniques
- Semiconductor materials and devices
- Superconductivity in MgB2 and Alloys
- Advancements in Semiconductor Devices and Circuit Design
- Radio Frequency Integrated Circuit Design
- Quantum optics and atomic interactions
- Semiconductor materials and interfaces
- Transition Metal Oxide Nanomaterials
Intel (United Kingdom)
2022
National Institute of Standards and Technology
2017-2021
Lancaster University
2021
Massachusetts Institute of Technology
2021
Jet Propulsion Laboratory
2021
Stony Brook University
2012-2015
We developed superconducting nanowire single-photon detectors based on tungsten silicide, which show saturated internal detection efficiency up to a wavelength of 10 μm. These are promising for applications in the mid-infrared requiring sub-nanosecond timing, ultra-high gain stability, low dark counts, and high efficiency, such as chemical sensing, LIDAR, matter searches, exoplanet spectroscopy.
Abstract To achieve the state-of-the-art photon detectors, extensive research has been carried out on graphene-based bolometers. These utilize graphene’s promising properties including its small heat capacity, weak electron-phonon coupling, and resistance. This article reviews recent development of cryogenic bolometers, which are particular interest importance for understanding as well taking advantage intrinsic graphene. We summarize major theoretical experimental developments in field,...
We fabricate graphene-TiOx-aluminum tunnel junctions and characterize their radio frequency response. Below the superconducting critical temperature of aluminum when biased within gap, devices show enhanced dynamic resistance which increases with decreasing temperature. Application radiation affects through electronic heating. The relation between electron rise absorbed power is measured, from bolometric parameters, including heat conductance, noise equivalent power, responsivity, are characterized.
This paper presents fully integrated power amplifier (PA) and low-noise (LNA) targeting 5G mmWave band n260 (37GHz-40GHz) in 300mm GaN-on-Si technology. At 39.5GHz, the PA achieves measured P <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">sat</inf> , peak PAE, linear gain, OP1dB of 25dBm, 38.8%, 24.8dB, 19.8dBm, occupying only 0.079mm <sup xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . The LNA 24.6dB 2.9dB noise figure, -11.4dBm IIP3 at...
We describe the properties of ultrasensitive graphene photon detectors for use in far-infrared/terahertz spectral region and present theoretical predictions their power detection sensitivity. These are based on two contacting schemes with superconducting contacts: contacts a thin insulating barrier, direct contacts. To quantitatively assess these predictions, we perform thermal measurements at low temperatures analyse them to extract information electron–phonon cooling graphene. new results...
Bloch oscillations in nanoscale Josephson junctions with a Coulomb charging energy comparable to the coupling are explored within context of model previously considered by Geigenmüller and Schön that includes Zener tunneling treats quasiparticle as an explicit shot-noise process. The dynamics junction quasicharge investigated numerically using both Monte Carlo ensemble approaches calculate voltage-current characteristics presence microwaves. We examine detail origin harmonic subharmonic...
Graphene is a promising candidate for building fast and ultra-sensitive bolometric detectors due to its weak electron-phonon coupling low heat capacity. In order realize practical graphene-based bolometer, several important issues, including the nature of radiation response, efficiency thermal conductance need be carefully studied. Addressing these we present graphene-superconductor junctions as viable option achieve efficient sensitive bolometers, with superconductor contacts serving hot...
We developed superconducting nanowire single-photon detectors (SNSPDs) based on tungsten silicide (WSi) that show saturated internal detection efficiency up to a wavelength of 10 um. These are promising for applications in the mid-infrared requiring ultra-high gain stability, low dark counts, and high such as chemical sensing, LIDAR, matter searches exoplanet spectroscopy.
This article reviews recent research for development of sensitive graphene photon detectors in the infrared/far infrared/THz range. For this range, has promising potential thermal detectors. Graphene ultra-small volume and low electron density, which gives relatively large heating per absorbed fast response. At temperatures electron-phonon energy loss is small, so ultrasensitive power detection possible. We review on science base such detectors, outline major design challenges. Important...