Quantum Nanostructures and
Nanofabrication Group

Prof. Karl K. Berggren and Dr. P. Donald Keathley

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New Publication “Measuring thickness in thin NbN films for superconducting devices”

New Publication “Measuring thickness in thin NbN films for superconducting devices”

May 28, 2019 | News Articles

The authors present the use of a commercially available fixed-angle multiwavelength ellipsometer for quickly measuring the thickness of NbN thin films for the fabrication and performance improvement of superconducting nanowire single photon detectors. The process can...
John Simonaitis awarded NSF fellowship

John Simonaitis awarded NSF fellowship

Apr 9, 2019 | News Articles

Congratulations to John Simonaitis on receiving the National Science Foundation Graduate Research Fellowship. This prestigious and competitive award will support his work for three years.
New Publication “Enhancement of Optical Response in Nanowires by Negative-Tone PMMA Lithography”

New Publication “Enhancement of Optical Response in Nanowires by Negative-Tone PMMA Lithography”

Mar 21, 2019 | News Articles

The method of negative-tone polymethyl methacrylate (PMMA) electron-beam lithography is investigated to improve the performance of nanowire-based superconducting detectors. Using this approach, the superconducting nanowire single-photon detectors (SNSPDs) have been...
New Publication  “Bridging the Gap Between Nanowires and Josephson Junctions: A Superconducting Device Based on Controlled Fluxon Transfer”

New Publication “Bridging the Gap Between Nanowires and Josephson Junctions: A Superconducting Device Based on Controlled Fluxon Transfer”

Mar 4, 2019 | News Articles

The basis for superconducting electronics can broadly be divided between two technologies: the Josephson junction and the superconducting nanowire. While the Josephson junction (JJ) remains the dominant technology due to its high speed and low power dissipation,...
New Publication  “Design and Simulation of a Linear Electron Cavity for Quantum Electron Microscopy”

New Publication “Design and Simulation of a Linear Electron Cavity for Quantum Electron Microscopy”

Feb 14, 2019 | News Articles

Quantum electron microscopy (QEM) is a measurement approach that could reduce sample radiation damage, which represents the main obstacle to sub-nanometer direct imaging of molecules in conventional electron microscopes. This method is based on the exploitation of...
New Publication  “Jitter Characterization of a Dual-Readout SNSPD”

New Publication “Jitter Characterization of a Dual-Readout SNSPD”

Feb 1, 2019 | News Articles

To better understand the origins of the timing resolution, also known as jitter, of superconducting nanowire single photon detectors (SNSPDs), we have performed timing characterizations of a niobium nitride SNSPD with a dual-ended readout. By simultaneously measuring...
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Recent Posts

  • New Publication: Electron energy loss spectroscopy of two-dimensional materials in a scanning electron microscope
  • New Publication on High-speed testing of superconducting electronics
  • New Publication: Photolithography-compatible three-terminal superconducting switch for driving CMOS loads
  • Community Outreach Event: Appalachian Optics Outreach Event 2025
  • New Publication: Determination of mid-infrared refractive indices of superconducting thin films using Fourier transform infrared spectroscopy

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