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Search Publications

NIST Authors in Bold

Displaying 1376 - 1400 of 2503

Observation of Iron Spin-States using Tabletop X-ray Emission Spectroscopy and Microcalorimeter Sensors

December 2, 2015
Author(s)
Young Il Joe, Galen C. O'Neil, Luis Miaja Avila, Joseph W. Fowler, Kevin L. Silverman, Daniel S. Swetz, Joel N. Ullom, Ralph Jimenez
X-ray emission spectroscopy (XES) is a powerful probe of the electronic and chemical state of elemental species embedded within more complex compounds. X-ray sensors that combine high resolving power and high collecting efficiency are desirable for photon

Exciton-dominated Dielectric Function of Atomically Thin MoS2 Films

November 24, 2015
Author(s)
Yilin Yu, Yifei Yu, Yongqing Cui, Wei Li, Gurarslan Alper, Peelaers Hartwin, Aspnes David, Chris Van de Walle, Nhan Van Nguyen, Zhang Yong-Wei, Linyou Cao
The control of photons by field effects, like the gating of electrons, can revolutionize a wide range of fields by enabling active photonic devices whose functions could be manipulated with sophistication and speeds comparable to what achieved in modern

Adapting the Poisson-Influenced K-Means Algorithm for a Larger User Base

November 19, 2015
Author(s)
Brian P. Morris, Zachary H. Levine
A superconducting transition edge sensor (TES) can be a useful tool for counting the number of photons in a highly attenuated pulse of light, but it requires calibration for its outputs to be interpretable as photon numbers. The Poisson-Influenced K-Means

Chemical potential for light

November 19, 2015
Author(s)
Jacob M. Taylor, Mohammad Hafezi, Prabin Adhikari
Photons are not conserved in interactions with other matter. Consequently, when understanding the equation of state and thermodynamics of photons, while we have a concept of temperature for energy conservation, there is no equivalent chemical potential for

Gold Nanoparticle Quantitation by Whole Cell Tomography

November 13, 2015
Author(s)
Aric W. Sanders, Kavita M. Jeerage, Cindi Schwartz, Alexandra Curtin, Ann C. Chiaramonti Debay
Many proposed biomedical applications for engineered gold nanoparticles require their incorporation by mammalian cells in specific numbers and locations. Here, the number of gold nanoparticles inside of individual mammalian stem cells was characterized

Schwere Experimente

November 1, 2015
Author(s)
Stephan Schlamminger, Christian Rothleitner
Obwohl die Standardunsicherheit der Gravitationskonstante in der neuesten Veröffentlichung des CODATA um über die Hälfte reduziert wurde, ist sie noch immer die am ungenauesten bestimmte Naturkonstante.

NIST on a Chip: Realizing SI units with microfabricated alkali vapour cells

October 16, 2015
Author(s)
John E. Kitching, Elizabeth A. Donley, Svenja A. Knappe, Matthew T. Hummon, Argyrios Dellis, Jeffrey A. Sherman, Kartik A. Srinivasan, Vladimir A. Aksyuk, Qiliang Li, Daron A. Westly, Brian J. Roxworthy, Amit Lal
We describe several ways in which microfabricated alkali atom vapour cells might potentially be used to accurately realize a variety of SI units, including the second, the meter, the kelvin, the ampere and the volt, in a compact, low-cost “chip-scale”

Compact atom-interferometer gyroscope based on an expanding ball of atoms

October 12, 2015
Author(s)
Elizabeth A. Donley, John E. Kitching, Stefan Riedl, Gregory W. Hoth, Bruno M. Pelle
We present a compact atom interferometer based on 87Rb atoms that can simultaneously measure rotations and accelerations with a single source of atoms in a 300 cm3 vacuum package.

Measurement of the Microwave Lensing Shift in NIST-F1 and NIST-F2

October 12, 2015
Author(s)
Steven R. Jefferts, Stephan E. Barlow, Thomas P. Heavner, Neil Ashby
We present measurements of the microwave lensing frequency shift in the Primary Frequency Standards (PFS) NIST-F1 and NIST-F2. This frequency bias is reasonably controversial with differing theories giving quite different results. Our measurements are in

Microfabricated Optically-Pumped Magnetometers for Biomagnetic Applications

October 12, 2015
Author(s)
Svenja A. Knappe, John E. Kitching, Orang Alem, Dong Sheng
We report on the progress in developing microfabricated optically-pumped magnetometer arrays for imaging applications. We have improved our sensitivities by several orders of magnitude in the last ten years, Now, our zero-field sensors reach values below

Octave-spanning supercontinuum generation via microwave frequency multiplication

October 12, 2015
Author(s)
Daniel C. Cole, Katja M. Beha, Scott B. Papp, Scott A. Diddams
We demonstrate a system based on telecom components for the generation of an octave-spanning supercontinuum from a continuous-wave laser. The system utilizes direct multiplication of the 10 GHz signal derived from a synthesizer. Pulses are carved from the

Cosolvency and cononsolvency explained in terms of a Flory-Huggins type theory

October 7, 2015
Author(s)
Jack F. Douglas, Jacek Dudowicz, Freed Karl
Standard classic Flory-Huggins (FH) theory is employed to describe the enigmatic cosolvency and co-nonsolvency phenomena for systems of polymers dissolved in mixed solvents. In particular, phase boundaries (spinodals) are calculated for solutions of

Broadly tunable, low timing jitter, high repetition rate optoelectronic comb generator

October 1, 2015
Author(s)
Franklyn J. Quinlan, A. J. Metcalf, Tara M. Fortier, Scott A. Diddams, Andrew M. Weiner
We investigate the low timing jitter properties of a tunable single-pass optoelectronic frequency comb generator. The scheme is flexible in that both the repetition rate and the center frequency can be continuously tuned. When operated at 10 GHz comb

Timekeeping in the Americas

October 1, 2015
Author(s)
Michael A. Lombardi, Jose M. Lopez
Time and its measurement belong to the most fundamental core of physics, and many scientific and technological advances are directly or indirectly related to time measurements. Timekeeping is essential to everyday life, and thus is the most measured

240 Hz linewidth Brillouin laser from a microrod whispering gallery mode resonator

September 29, 2015
Author(s)
William Loh, Aurelien C. Coillet, Frederick N. Baynes, Scott B. Papp, Scott A. Diddams, Joe Becker
We demonstrate an ultra-low noise laser that oscillates based on the stimulated Brillouin scattering nonlinearity in an optical microresonator. Our Brillouin laser employs a microrod resonator whose larger mode volume compared to conventional resonators

Three-level Haldane-like model on a dice optical lattice

September 21, 2015
Author(s)
Ian B. Spielman, T. Andrijauskas, E. Anisimovas, M. Raciunas, A. Mekys, V. Kudriasov, G. Juzeliunas
We consider ultracold atoms in a two-dimensional optical lattice of the dice geometry in a tight-binding regime. The atoms experience a laser-assisted tunneling between the nearest neighbor sites of the dice lattice accompanied by the momentum recoil. This
Displaying 1376 - 1400 of 2503
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