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Physics

Spectroscopy

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Displaying 426 - 450 of 1700

Nonlinear Silicon waveguides produce tunable frequency combs spanning 2.0-8.5 ?m

September 25, 2019
Author(s)
Nima Nader, Abijith S. Kowligy, Jeffrey T. Chiles, Eric J. Stanton, Henry R. Timmers, Alexander J. Lind, Kimberly Briggman, Scott Diddams, Flavio Caldas da Cruz, Richard Mirin, Sae Woo Nam, Daniel M. Lesko
We present fully air clad suspended-silicon waveguides for efficient nonlinear interactions limited only by the silicon transparency. Novel fork-shaped couplers provide efficient input ( 2 dB) and broadband 3 dB output coupling spanning 6.0-8.5 υm

Near-infrared photonic phase-change properties of transition metal ditellurides.

September 23, 2019
Author(s)
Albert Davydov, Sergiy Krylyuk, Yifei Li, Akshay Singh, Rafael Jaramillo
We use the (Mo,W)Te2 system to explore the potential of transition metal dichalcogenides (TMDs) as phasechange materials for integrated photonics. We measure the complex optical constant of MoTe2 in both the 2H and 1T’ phases by spectroscopic ellipsometry

Contactless Resonant Cavity Dielectric Spectroscopic Studies of Cellulosic Paper Aging

August 28, 2019
Author(s)
Mary Kombolias, Jan Obrzut, Michael T. Postek, Dianne L. Poster, Yaw S. Obeng
The current analytical techniques for characterizing printing and graphic arts substrates, particularly those used to date and to authenticate provenance, are largely ex situ and destructive. This limits the amount of data that can be captured from an

Ramsey-Borde Matter-Wave Interferometry for Laser Frequency Stabilization at 10 -16 Frequency Instability and Below

August 13, 2019
Author(s)
Judith B. Olson, Todd Sheerin, Holly Leopardi, Roger C. Brown, Richard W. Fox, Rick Stoner, Tara M. Fortier, Christopher W. Oates, Andrew D. Ludlow
We demonstrate Ramsey-Borde (RB) atom interferometry for high performance laser stabilization with fractional frequency instability −16 for timescales between 10 and 1000s. The RB spectroscopy laser interrogates two counterpropagating 40Ca beams on the 1S

Nonresonant transmission line probe for sensitive interferometric electron spin resonance detection

August 5, 2019
Author(s)
Pragya R. Shrestha, Nandita S. Abhyankar, Mark A. Anders, Kin P. Cheung, Robert M. Gougelet, Jason T. Ryan, Veronika A. Szalai, Jason P. Campbell
Electron spin resonance (ESR) spectroscopy measures paramagnetic free radicals, or electron spins, in a variety of biological, chemical, and physical systems. Detection of diverse paramagnetic species is important in applications ranging from quantum

Developing Next-generation Brain Sensing Technologies - A Review

July 22, 2019
Author(s)
Jacob T. Robinson, Eric Pohlmeyer, Malte C. Gather, Caleb Kemere, John Kitching, George G. Malliaras, Adam Marblestone, Kenneth L. Shepard, Thomas Stieglitz, Chong Xie
Advances in sensing technology raise the possibility of creating neural interfaces that can more effectively restore or repair neural function and reveal fundamental properties of neural information processing. To realize the potential of these

Contemporary x-ray wavelength metrology and traceability

July 3, 2019
Author(s)
Lawrence T. Hudson, James P. Cline, Albert Henins, Marcus H. Mendenhall, Csilla I. Szabo-Foster
We report recent advances in absolute x-ray wavelength metrology in the context of producing modern standard reference data. Primary standard x-ray wavelengths are typically measured with two-crystal (or more) diffraction spectrometers operated in

High x-ray resolving power (up to 4000) utilizing asymmetric diffraction from a quartz transmission crystal measured in the 6 keV to 22 keV energy range

June 27, 2019
Author(s)
Lawrence T. Hudson, John F. Seely, Eric Galtier, Uri Feldman, Albert Henins
A Cauchois type spectrometer utilizing the (203) lattice planes at an oblique angle of 11.53o to the surface of a quartz transmission crystal recorded the Kα and Kβ spectral lines of six elements from Fe to Ag in the 6 keV to 22 keV energy range from a

Classical polarimetry with a twist: a compact, geometric approach

May 22, 2019
Author(s)
William Sparks, Thomas Germer, Rebecca M. Sparks
We present an approach to classical polarimetry which requires no moving parts, is compact and robust, and which encodes the complete polarization information on a single data frame, accomplished by replacing the rotation of components such as wave plates
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