425 citations · 922 across the 20 of their papers we have counts for
20 papers
On Ultrafast X-ray Methods for Magnetism
Rajan Plumley, Sathya Chitturi, Cheng Peng +36
With the introduction of x-ray free electron laser sources around the world, new scientific approaches for visualizing matter at fundamental length and time-scales have become poss…
Wavelength and phase considerations for multi-pulse plasma generation of terahertz
Clayton D. Moss, Shayne A. Sorenson, Jeremy A. Johnson
We present a numerical study on plasma generation of THz radiation utilizing multiple light pulses of various wavelengths in an optical scheme that is readily achievable in a table…
A new standard in high-field terahertz generation: the organic nonlinear optical crystal PNPA
Claire Rader, Zachary B. Zaccardi, Sin Hang +6
We report the full characterization of a new organic nonlinear optical (NLO) crystal for intense THz generation: PNPA ((E)-4-((4-nitrobenzylidene)amino)-N-phenylaniline). We discus…
Data Mining for Terahertz Generation Crystals
Gabriel A. Valdivia-Berroeta, Zachary B. Zaccardi, Sydney K. F. Pettit +13
We demonstrate a data mining approach to discover and develop new organic nonlinear optical crystals that produce intense pulses of terahertz radiation. We mine the Cambridge Struc…
Enabling High-Power, Broadband THz Generation with 800-nm Pump Wavelength
Zachary B. Zaccardi, Isaac C. Tangen, Gabriel A. Valdivia-Berroeta +7
The organic terahertz (THz) generation crystal BNA has recently gained traction as a valuable source to produce broadband THz pulses. Even when pumped with 800-nm light, thin BNA c…
Comprehensive Characterization of Terahertz Generation with the Organic Crystal BNA
Isaac C. Tangen, Gabriel A. Valdivida-Berroeta, Larry K. Heki +5
We characterize the terahertz (THz) generation of N-benzyl-2-methyl-4-nitroaniline (BNA), with crystals ranging in thickness from 123-700 μm. We compare excitation using 800-nm and…
Enhancing terahertz generation from a two-color plasma using optical parametric amplifier waste light
Shayne A. Sorenson, Clayton D. Moss, Steven K. Kauwe +2
We show experimentally that the terahertz (THz) emission of a plasma, generated in air by a two-color laser pulse (containing a near IR frequency and its second harmonic), can be e…
Laser-induced plasma generation of terahertz radiation using three incommensurate wavelengths
Jacob D. Bagley, Clayton D. Moss, Jeremy A. Johnson
We present the generation of THz radiation by focusing ultrafast laser pulses with three incommensurate wavelengths to form a plasma. The three colors include 800 nm and the variab…
Watching the birth of a charge density wave order: diffraction study on nanometer-and picosecond-scales
C. Laulhé, T. Huber, G. Lantz +18
Femtosecond time-resolved X-ray diffraction is used to study a photo-induced phase transition between two charge density wave (CDW) states in 1T-TaS, namely the nearly commensu…
Experimentally Exploring the Interatomic Potential in a Ferroelectric Crystal via Optimal Ultrafast Lattice Control
Blake S. Dastrup, Jacob R. Hall, Jeremy A. Johnson
We present a direct comparison between resonant terahertz (THz) and nonresonant impulsive stimulated Raman scattering (ISRS) excitation of phonon-polaritons in ferroelectric lithiu…
Direct Test of Supercooled Liquid Scaling Relations
Tina Hecksher, Darius H. Torchinsky, Christoph Klieber +3
Diverse material classes exhibit practically identical behavior when made viscous upon cooling toward the glass transition, suggesting a common theoretical basis. The first-princip…
Thermal transport in suspended silicon membranes measured by laser-induced transient gratings
Alejandro Vega-Flick, Ryan A. Duncan, Jeffrey K. Eliason +12
Studying thermal transport at the nanoscale poses formidable experimental challenges due both to the physics of the measurement process and to the issues of accuracy and reproducib…
Ultrafast x-ray diffraction of a ferroelectric soft mode driven by broadband terahertz pulses
S. Grübel, J. A. Johnson, P. Beaud +14
Intense, few-cycle pulses in the terahertz frequency range have strong potential for schemes of control over vibrational modes in solid-state materials in the electronic ground-sta…
Ultrafast Laser-Induced Melting of Long-Range Magnetic Order in Multiferroic TbMnO3
Jeremy A. Johnson, T. Kubacka, M. C. Hoffmann +25
We performed ultrafast time-resolved near-infrared pump, resonant soft X-ray diffraction probe measurements to investigate the coupling between the photoexcited electronic system a…
Ultrafast structural dynamics of the Fe-pnictide parent compound BaFe2As2
L. Rettig, S. O. Mariager, A. Ferrer +8
Using femtosecond time-resolved x-ray diffraction we investigate the structural dynamics of the coherently excited A1g phonon mode in the Fe-pnictide parent compound BaFe2As2. The…
Reconstructing phonon mean free path contributions to thermal conductivity using nanoscale membranes
John Cuffe, Jeffery K. Eliason, Alexei A. Maznev +8
Knowledge of the mean free path distribution of heat-carrying phonons is key to understanding phonon-mediated thermal transport. We demonstrate that thermal conductivity measuremen…
Structural and Magnetic Dynamics in the Magnetic Shape Memory Alloy NiMnGa
S. O. Mariager, C. Dornes, J. A. Johnson +11
Magnetic shape memory Heusler alloys are multiferroics stabilized by the correlations between electronic, magnetic and structural order. To study these correlations we use time res…
Direct Measurement of Room Temperature Non-diffusive Thermal Transport Over Micron Distances in a Silicon Membrane
Jeremy A. Johnson, A. A. Maznev, John Cuffe +6
The "textbook" phonon mean free path (MFP) of heat carrying phonons in silicon at room temperature is ~40 nm. However, a large contribution to the thermal conductivity comes from l…
Phase-controlled, heterodyne laser-induced transient grating measurements of thermal transport properties in opaque material
Jeremy A. Johnson, Alexei A. Maznev, Keith A. Nelson +6
The methodology for a heterodyned laser-induced transient thermal grating technique for non-contact, non-destructive measurements of thermal transport in opaque material is present…
-Scale Decoupling of the Mechanical Relaxation and Diverging Shear Wave Propagation Lengthscale in Triphenylphosphite
Darius H. Torchinsky, Jeremy A. Johnson, Keith A. Nelson
We have performed depolarized Impulsive Stimulated Scattering experiments to observe shear acoustic phonons in supercooled triphenylphosphite (TPP) from 10 - 500 MHz. These m…