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Physics

Spectroscopy

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Displaying 76 - 100 of 904

Direct Visualization of Chemically Resolved Multilayered Domains in Mixed-Linker Metal-Organic Frameworks

June 15, 2023
Author(s)
Andrea Centrone, Belen Lerma-Berlanga, Adam Biacchi, Carmen Fernandez Conde, Georges Pavlidis, Carlos Marti-Gastaldo
The modular synthesis approach for assembling inorganic nodes and organic multidentate linkers into reticular solids enables rational engineering in porous materials known as metal-organic frameworks (MOFs). Incorporation of two or more linker types in MOF

A chip-scale atomic beam clock

June 13, 2023
Author(s)
Gabriela Martinez, Chao Li, Alexander Staron, John Kitching, Chandra Raman, William McGehee
We demonstrate a passively pumped, chip-scale atomic beam clock fabricated using a stack of silicon and glass wafers. The device could additionally serve as a platform for compact atom interferometers and other future quantum sensors.

Extending Dual-Comb Spectroscopy Path Length to 14.5 km by Separating Receiver from Transmitter

June 1, 2023
Author(s)
Fabrizio Giorgetta, Esther Baumann, Brian Washburn, Nathan Malarich, J.-D. Deschenes, Ian Coddington, Nathan Newbury, Kevin Cossel
We present dual-comb spectroscopy across a 14.5-km path using remote receiver and data acquisition. This configuration results in lower link losses compared to open-path configurations with co-located transmitter and receiver.

mDTEB, a new fluorescent label for carbohydrate nano-material in vivo studies

May 27, 2023
Author(s)
Jeremiah Woodcock, Douglas M. Fox, Ilabahen A. Patel, Joy Dunkers, Stephan J. Stranick, Jeffrey W. Gilman
Typical studies of gastral toxicity are conducted using radio labeling. This tends to be quite expensive and difficult owing to the required protocols for working with these materials and the expense of the chemical reagents. A possible alternative is

Relaxation measurements of an MRI system phantom at low magnetic field strengths

May 20, 2023
Author(s)
Michele Martin, Kalina Jordanova, Anthony Kos, Stephen E. Russek, Katy Keenan, Karl Stupic
Abstract Objective Temperature controlled T 1 and T 2 relaxation times are measured on NiCl 2 and MnCl 2 solutions from the ISMRM/NIST system phantom at low magnetic field strengths of 6.5 mT, 64 mT and 550 mT. Materials and methods The T 1 and T 2 were

Signal Readout for Transition-Edge Sensor X-ray Imaging Spectrometers

May 20, 2023
Author(s)
Hiroki Akamatsu, W.Bertrand (Randy) Doriese, John Mates, Brian Jackson
Arrays of low-temperature microcalorimeters provide a promising technology for X-ray astrophysics: the imaging spectrometer. A camera with at least several thousand pixels, each of which has an energy-resolving power (E∕ΔE_FWHM) of a few thousand across a

Rydberg Excitons and Trions in Monolayer MoTe2

April 12, 2023
Author(s)
Souvik Biswas, Aurelie Champagne, Jonah Haber, supavit pokawanvit, Joeson Wong, Hamidreza Akbari, Sergiy Krylyuk, Kenji Watanabe, Albert Davydov, Zakaria Al Balushi, Felipe H. da Jornada, Diana Qiu, Jeffrey Neaton, Harry Atwater
Monolayer transition metal dichalcogenide (TMDC) semiconductors exhibit strong excitonic optical resonances which serve as a microscopic, non-invasive probe into their fundamental properties. Like the hydrogen atom, such excitons can exhibit an entire

Rydberg Engineering: Recent Techniques for Sensitive Field Measurements

February 9, 2023
Author(s)
Drew Rotunno, Nik Prajapati, Samuel Berweger, Aly Artusio-Glimpse, MATTHEW SIMONS, chris holloway, Amy Robinson
Highly-excited Rydberg atoms have been used for International System of Unit (SI)-traceable radio-frequency (RF) electric field and power measurements, but are limited in sensitivity to order 100 $\mu$V/m/$\sqrtHz}$ by noise and linewidth issues. These

Single-modulator, direct frequency comb spectroscopy via serrodyne modulation

February 3, 2023
Author(s)
David Long, Sean Bresler, Yiliang Bao, Benjamin Reschovsky, Thomas W. LeBrun, Jason J. Gorman
Traditional electro-optic frequency comb spectrometers rely upon the use of an acousto-optic modulator (AOM) to provide a differential frequency shift between probe and local oscillator (LO) legs of the interferometer. Here we show that these modulators

Validation of open-path dual-comb spectroscopy against an O2 background

January 30, 2023
Author(s)
Nathan Malarich, Brian Washburn, Kevin Cossel, Fabrizio Giorgetta, Griffin Mead, Daniel Herman, Nathan R. Newbury, Ian Coddington
Dual-comb spectroscopy measures greenhouse gas concentrations over kilometer-length open-air paths with high precision. However, characterizing the absolute accuracy of these outdoor measurements is challenging, as most gas species have fluctuating

2022 Topical Meeting on Optical Interference Coatings: Manufacturing Problem Contest

January 11, 2023
Author(s)
Catherine Cooksey, Daniel Poitras, Luke Sandilands, Penghui Ma, Stacey Lee, Michael Jacobson
Participants to the 2022 Manufacturing Contest were challenged to fabricate an optical filter with a specified stepped transmittance spanning three orders of magnitude from 400 nm to 1100 nm. The problem required that contestants be equally versed in the

Interface formation and Schottky barrier height for Y, Nb, Au, and Pt on Ge as determined by hard x-ray photoelectron spectroscopy

January 6, 2023
Author(s)
Abdul Rumaiz, Ian Harding, Conan Weiland, Neha Nooman, Thomas Krings, Ethan Hull, Gabriele Giacomini, Wei Chen, Eric J. Cockayne, D. Peter Simmons, Joseph Woicik
Development of a robust, thin, hole-blocking (n+) contact on high purity germanium (HPGe) has been the main challenge in the development of Ge-based radiation sensors. Yttrium has been reported to be a viable hole-blocking contact on HPGe, and detectors

Symmetry-dependent ultrafast manipulation of nanoscale magnetic domains

December 23, 2022
Author(s)
Nanna Hagstrom, Rahul Jangid, F. N. U. Meera, Diego Turenne, Jeffrey Brock, Erik Lamb, Boyan Stoychev, Justine Schlappa, Natalia Gerasimova, Benjamin Van Kuiken, Rafael Gort, Laurent Mercadier, Loic Le Guyader, Andrey Samartsev, Andreas Scherz, Giuseppe Mercurio, Hermann Durr, Alexander Reid, Monika Arora, Hans Nembach, Justin Shaw, Emmanuelle Jal, Eric Fullerton, Mark Keller, Roopali Kukreja, Stefano Bonetti, Thomas J. Silva, Ezio Iacocca
Symmetry is a powerful concept in physics, but its applicability to far-from-equilibrium states is still being understood. Recent attention has focused on how far-from-equilibrium states lead to spontaneous symmetry breaking. Conversely, ultrafast optical
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