NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.

Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.

U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications

NIST Authors in Bold

Displaying 76 - 100 of 73697

Direct measurement of the 3P0 clock state natural lifetime in 87Sr

August 24, 2025
Author(s)
Kyle Beloy, Jonathan Dolde, Dhruva Ganapathy, Xin Zheng, Shuo Ma, Shimon Kolkowitz
Optical lattice clocks based on the narrow transition between (5s2)1S0 -(5s5p)3P0 levels in neutral strontium (Sr) are among the most precise and accurate measurement devices in existence. Although this transition is completely forbidden by selection rules

From ultra-noisy to ultra-stable: optimization of the optoelectronic laser lock

August 24, 2025
Author(s)
Takuma Nakamura, Yifan Liu, Naijun Jin, Haotian Cheng, Charles McLemore, Nazanin Hoghooghi, Peter Rakich, Franklyn Quinlan
We demonstrate thermal noise-limited direct locking of a semiconductor DFB laser to a sub-1 mL volume, ultrastable optical cavity, enabling extremely compact and simple ultrastable laser systems. Using the optoelectronic laser locking method, we realize

Ion Coulomb crystals: an exotic form of condensed matter

August 24, 2025
Author(s)
Giovanna Morigi, John Bollinger, Michael Drewsen, Daniel Podolsky, Efrat Shimshoni
Wigner crystals formed by laser-cooled ions in traps are unconventional condensed matter systems, characterized by interparticle distances of several micrometers and energy scales on the order of meV. Their crystalline structure emerges from the interplay

EVALUATING IDENTITY LEAKAGE IN SPEAKER DE-IDENTIFICATION SYSTEMS

August 21, 2025
Author(s)
Seungmin Seo, Oleg Aulov, Afzal Godil, Kevin Mangold
Speaker de-identification aims to conceal a speaker's identity while preserving intelligibility of the underlying speech. We introduce a benchmark that quantifies residual identity leak- age with three complementary error rates: equal error rate (EER)

Evaluating the Impact of Changes to the Internal Publication Review Policy at NIST

August 21, 2025
Author(s)
Juan Fung, Michael Hall, Jennifer Helgeson, Alden Dima, Anne Andrews, Jennifer Benkstein
This report presents the design and methodology of a survey conducted to evaluate the impact of changes to the organizational publication review policy at the National Institute for Standards and Technology (NIST). The purpose of the survey is to collect

Kelvin probe force microscopy under ambient conditions

August 21, 2025
Author(s)
Amirhossein Zahmatkeshsaredorahi, Ruben Millan-Solsona, Devon Jakob, Liam Collins, Xiaoji Xu
Kelvin Probe Force Microscopy (KPFM), a technique derived from Atomic Force Microscopy (AFM), provides nanometer-scale spatial resolution for mapping surface potential or work function differences across material systems. It serves as a powerful tool for

Considerations for Implementing Morph Detection in Operations

August 18, 2025
Author(s)
Mei Ngan, Patrick Grother
Morphing of face photographs present a threat to identity processes; for example, two people being able to use one passport. The threat exists in applications that allow users to submit their own photos where digital history is unknown. The threat can be

Quantum Vibro-Polaritonic Sensing

August 15, 2025
Author(s)
Peng Zheng, Stephen Semancik, Ishan Barman
Vibrational spectroscopies are pivotal in analytical methods and biomedical diagnostics owing to their singular ability to provide molecular specificity. Yet, they are intrinsically limited by weak light-matter interactions and their vulnerability to

System-Level Calibration of a Millimeter-Wave Vector Signal Analyzer with Uncertainties

August 15, 2025
Author(s)
Joshua Kast, Paritosh Manurkar, Catherine Remley, Dylan Williams, Robert Horansky
We describe the system-level calibration of a vector signal analyzer operating in the 28 GHz frequency band, including the determination of uncertainties in the magnitude and phase of measurements of a traceably characterized calibration waveform. We then

Interfacial Alloying Contributions to the Magnetic Proximity Effect in Pt/Dysprosium Iron Garnet

August 12, 2025
Author(s)
Miela J. Gross, Javier Herrero-Martin, Sergio Valencia, Alexander Grutter, Julie Borchers, Yongseong Choi, Gilberto Fabbris, Allison Kaczmarek, Alexander E. Kossak, Jackson Bauer, Subhajit Kundu, Supriya Ghosh, K. A. Mkhoyan, Angela Wittmann, Caroline A. Ross
The magnetic proximity effect (MPE) plays an important role in the behavior of heavy-metal (HM)/ferro- or ferrimagnet thin film heterostructures, but for HM/rare earth iron garnet interfaces the presence and magnitude of the MPE has been debated. We

Fully transparent GaN/InGaN LED as a position sensitive detector

August 11, 2025
Author(s)
Christine McGinn, Keith Behrman, Emily Bittle, Pragya Shrestha, Qingyuan Zeng, Vikrant Kumar, Christina Hacker, Ioannis Kymissis
Commercial imaging technologies have an increasing need for an accurate, in-situ beam locator to ensure laser alignment during operation. In this work, gallium nitride LED with indium gallium nitride quantum wells is leveraged is leveraged to create a

Characterizing Cell-Free Transcription and Translation Dynamics with Nucleic Acid-Based Assays

August 10, 2025
Author(s)
Fernanda Piorino Macruz de Oliveira, Chad Alan Sundberg, Elizabeth Strychalski, Eugenia Romantseva
Characterization of cell-free expression (CFE) systems must expand beyond single spectrophotometric measurements of a green fluorescent protein to provide meaningful metrics of system performance over the course of a CFE reaction and enable the development

Radio Frequency from Optical with Instabilities below 10^-15 - Generation and Measurement

August 8, 2025
Author(s)
Archita Hati, Marco Pomponio, Nicholas Nardelli, Tanner Grogan, Kyungtae Kim, Dahyeon Lee, Jun Ye, Tara Fortier, Andrew Ludlow, Craig Nelson
This paper presents a frequency synthesis that achieved exceptional stability by transferring optical signals to the RF domain at 100 MHz. These systems employ a cryogenic silicon cavity-stabilized laser at 1542 nm and an ultra-low expansion (ULE) glass

Three-dimensional nucleation and growth of deformation twins in magnesium

August 7, 2025
Author(s)
Sangwon Lee, Michael Pilipchuk, Can Yildirim, Duncan Greeley, Qianying Shi, Tracy Berman, Adam Creuziger, Evan Rust, Carsten Detlefs, Veera Sundararaghavan, John Allison, Ashley Bucsek
At two-thirds the weight of aluminum, magnesium alloys have the potential to significantly reduce the fuel consumption of transportation vehicles. These advancements depend on our ability to optimize the desirable versus undesirable effects of deformation
Displaying 76 - 100 of 73697
Was this page helpful?