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Search Publications by: Fabio C.S. Da Silva (Assoc)

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Displaying 1 - 20 of 20

2019 Public Safety Broadband Stakeholder Presentations by NIST Authors

October 25, 2021
Author(s)
Richard A. Rouil, Tom Henderson, Marco Mezzavilla, Michele Polese, Jaden Pieper, Chunmei Liu, Silas Thompson, David W. Griffith, Christopher Walton, Christopher D. Dennis, Fabio C. da Silva, John S. Garofolo, James M. Horan, Samuel Hood, Julie Stroup, Christine Task, Terese Manley, Sam Ray, Alison Kahn, Maxwell Maurice, Hien V. Nguyen, Frederick R. Byers, Kristen K. Greene, Mary Theofanos, Yee-Yin Choong, Sandra Spickard Prettyman, Pamela J. Konkol, Jeffrey Cichonski, Bill Fisher, Gema Howell, Mike Dolan, Adam Lewis, Michael Ogata, John Beltz, Michael Bartock, Sarah Hughes, Santosh Rajvaidya, Craig Connelly, Scott Ledgerwood, Megan Waldock, Dereck R. Orr, Donald Bradshaw, Jeb Benson
2019 Public Safety Broadband Stakeholder Presentations by NIST Authors

Field Compressed Sensing

January 17, 2020
Author(s)
Anthony B. Kos, Fabio C. Da Silva, Jason B. Coder, Craig W. Nelson, Grace E. Antonucci, Archita Hati
Imaging solutions based on wave scattering seek real-time performance, high dynamic range, and spatial accuracy at scales spanning from nanometers to thousands of kilometers. Compressed sensing algorithms use sparsity to reduce sample size during image

An atomic sensor for direct detection of weak microwave signals

August 16, 2019
Author(s)
Vladislav Gerginov, Fabio C. da Silva, Craig Nelson, Archita Hati
This paper demonstrates direct detection of weak signals at microwave frequencies based on parametric frequency conversion. The atomic medium is optically pumped by a resonant light field and prepared in a coherent atomic superposition by a weak microwave

PSCR 2017 Stakeholder Conference Presentation Materials -- Day 3

October 16, 2018
Author(s)
Dereck R. Orr, Richard A. Rouil, Jeremy E. Benson, David W. Griffith, Fidel Liberal, Robert Escalle, Sonim Technologies, Richard Lau, Vencore Labs, Paul Sutton, Software Radio Systems LTD, Sumit Roy, Sean Sangodoyin, David A. Howe, Fabio C. Da Silva, Alicia Evangelista, Yet2, Brienne Engel, Yet2, John S. Garofolo
This document is a compilation of the slides presented during Day 3 of the 2017 Public Safety Communications Research Program's (PSCR) Annual Stakeholder Conference. Day 3 topics include PSCR research plans and results for Mission Critical Voice, Indoor

Effect of Local Oscillator Performance on UWB Based Indoor Localization System

May 21, 2018
Author(s)
Archita Hati, Fabio C. Da Silva, Vladislav P. Gerginov, Craig W. Nelson
We discuss the performance of a commercial Ultra-wideband (UWB) ranging technique for indoor localization. We study the influence of local oscillator's phase noise and its frequency drifts due to temperature variations on the range estimation and ranging

Prospects for Magnetic Field Communications and Location Using Quantum Sensors

December 14, 2017
Author(s)
Vladislav P. Gerginov, Fabio C. Da Silva, David A. Howe
Signal attenuation limits the operating range in wireless communications and location. To solve the reduced range problem, one can use low-frequency signals in combination with magnetic sensing. We propose the use of an optically-pumped magnetometer as a

Tunable Resonant and Nonresonant Interactions between a Phase Qubit and LC Resonator

March 26, 2014
Author(s)
Michael S. Allman, Jed D. Whittaker, Manuel C. Castellanos Beltran, Katarina Cicak, Fabio C. Da Silva, Michael DeFeo, Florent Q. Lecocq, Adam J. Sirois, John D. Teufel, Jose A. Aumentado, Raymond W. Simmonds
We use a flux-biased radio frequency superconducting quantum interference device (rf SQUID) with an embedded flux-biased direct current SQUID to generate strong resonant and nonresonant tunable interactions between a phase qubit and a lumped-element

A titanium-nitride near-infrared kinetic inductance photon-counting detector and its anomalous electrodynamics

October 1, 2012
Author(s)
Martin O. Sandberg, Fabio C. da Silva, Kent D. Irwin, David P. Pappas, Sae Woo Nam, David Wisbey, Ben Mazin, Seth Meeker, Jonas Zmuidzinas, Henry G. Leduc
We demonstrate single-photon counting at 1550 nm with titanium-nitride (TiN) microwave kinetic inductancedetectors. Full-width-at-half-maximum energy resolution of 0.4 eV is achieved. 0-, 1-, 2- photon events are resolved and shown to follow Poisson

Effect of metal/substrate interfaces on radio-frequency loss in superconducting coplanar waveguides

November 8, 2010
Author(s)
David S. Wisbey, Jiansong Gao, Fabio C. da Silva, Jeffrey S. Kline, Michael Vissers, David P. Pappas, Leila R. Vale
Microscopic two-level systems (TLSs) are known to contribute to loss in resonant superconducting microwave circuits. This loss increases at low power and temperatures as the TLSs become unsaturated. We find that the loss is dependent on both the substrate

Remote sensing and control of phase qubits

September 10, 2010
Author(s)
Dale Li, Fabio C. Da Silva, Danielle Braje, Raymond W. Simmonds, David P. Pappas
We demonstrate a remote sensing design of phase qubits by separating the control and readout circuits from the qubit loop. This design improves measurement reliability because the control readout chip can be fabricated using more robust materials and can

Oersted Field Induced Magnetization Scissoring In Permalloy Bars

December 10, 2009
Author(s)
Lu Yuan, Fabio C. da Silva, Sean Halloran, Hamid Z. Fardi, David P. Pappas
We have systematically studied the magnetization behavior induced by the applied current in the permalloy (Ni81Fe19) bars using second and third harmonic analysis. Three types of sample were studied with layer structures of Al30/NiFe10, NiFe5/Al30/NiFe5

Magnetic Noise in a Low-Power Picotesla Magnetoresistive Sensor

October 25, 2009
Author(s)
Stephen E. Russek, Lu Yuan, Sean Halloran, Fabio C. da Silva, David P. Pappas, John M. Moreland, Sy-hwang Liou, Rui Zhang
We present a design of a low power, compact, magnetoresistive sensor. The key features of the design are(1) decreasing the noise by the use of a 64 element magnetic tunnel junction (MTJ) bridge,(2) reducing the magnetic noise by annealing the MTJ sensors

Modification of magnetotransport properties across patterned GaMnAs nanoconstrictions by application of high current densities

July 17, 2009
Author(s)
David P. Pappas, Fabio Cesar Da Silva, Teresa Osminer, Sung Un Cho, Hyung Choi, Chan Yang, Yun Park
We report on the modification of magnetotransport properties across patterned GaMnAs nanoconstrictions by the application of high current densities (< 107 A/cm2). We observe controllable changes in the electrical resistance with the direction of the bias

A z-component magneto-resistive sensor

April 8, 2008
Author(s)
Fabio C. da Silva, Sean Halloran, Lu Yuan, David P. Pappas
A thin-film sensor is described that measures the component of the magnetic field perpendicular to the plane of the substrate (also called the z-component field.) The sensors are fabricated on anisotropically etched, V-shaped groves on Si(100) substrates

256-Channel Magnetic Imaging System

January 18, 2008
Author(s)
Fabio C. da Silva, Sean Halloran, Anthony B. Kos, David P. Pappas
We present the design and fabrication of a magentoresistive imaging system capable of measuring 256 channels simultaneously along linear ranges of 4 mm and 13 mm. The channels are interfaced by custom electronics and the images are displayed in real time

256-channel magnetic imaging system

January 15, 2008
Author(s)
Fabio C. Da Silva, Sean Halloran, Anthony B. Kos, David P. Pappas
We present the design and fabrication of a magnetoresistive imaging system capable of scanning 256 channels simultaneously along linear ranges of either 4 or 13 mm. High speed electronics read the channels and transfer the data to a computer that builds

Development of a thin film magnetic moment reference material

January 1, 2008
Author(s)
Robert R. Owings, Fabio C. Da Silva, David P. Pappas
This paper presents the results of an interlaboratory comparison and development of a magnetic moment reference material. The comparison was between the National Institute of Standards and Technology, magnetometer manufacturers, industrial, academic, and

Zigzag-shaped magnetic sensors

December 13, 2004
Author(s)
Fabio C. da Silva, Willard C. Uhlig, Anthony B. Kos, Susan A. Schima, Joe Aumentado, John Unguris, David P. Pappas
Magnetism in zigzag-shaped thin-film elements is investigated using scanning electron microscopy with polarization analysis, magnetotransport measurements, and micromagnetic simulations. We find that the angle of magnetization alternates along the length

Arrays of magnetoresistive sensors for nondestructive testing

July 20, 2004
Author(s)
David P. Pappas, Fabio C. da Silva, Alexy V. Nazarov
Magnetic field distributions were measured for test stripline structures with anisotropic magnetoresistive (AMR), thin film Permalloy sensors. Linear arrays of eight barber-pole-type AMR sensors were used to increase the speed of the imaging and stability
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