Joshua L. Knobloch
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View article: Nanoscale confinement of phonon flow and heat transport
Nanoscale confinement of phonon flow and heat transport Open
Efficient thermal management is critical to device performance and reliability for energy conversion, nanoelectronics, and the development of quantum technologies. The commonly-used diffusive model of heat transport breaks down for confine…
View article: Universal Behavior of Highly Confined Heat Flow in Semiconductor Nanosystems: From Nanomeshes to Metalattices
Universal Behavior of Highly Confined Heat Flow in Semiconductor Nanosystems: From Nanomeshes to Metalattices Open
Nanostructuring on length scales corresponding to phonon mean free paths provides control over heat flow in semiconductors and makes it possible to engineer their thermal properties. However, the influence of boundaries limits the validity…
View article: Universal behavior of highly-confined heat flow in semiconductor nanosystems: from nanomeshes to metalattices
Universal behavior of highly-confined heat flow in semiconductor nanosystems: from nanomeshes to metalattices Open
Nanostructuring on length scales corresponding to phonon mean free paths provides control over heat flow in semiconductors and makes it possible to engineer their thermal properties. However, the influence of boundaries limits the validity…
View article: Temporal and spectral multiplexing for EUV multibeam ptychography with a high harmonic light source
Temporal and spectral multiplexing for EUV multibeam ptychography with a high harmonic light source Open
We demonstrate temporally multiplexed multibeam ptychography implemented for the first time in the EUV, by using a high harmonic based light source. This allows for simultaneous imaging of different sample areas, or of the same area at dif…
View article: Directional thermal channeling: A phenomenon triggered by tight packing of heat sources
Directional thermal channeling: A phenomenon triggered by tight packing of heat sources Open
Significance A critical factor in determining the achievable speeds and efficiencies of electronic devices is the operating temperature. As modern transistors shrink in size to as small as 5 nm, optimal design for temperature control requi…
View article: A General and Predictive Understanding of Thermal Transport from 1D- and 2D-Confined Nanostructures: Theory and Experiment
A General and Predictive Understanding of Thermal Transport from 1D- and 2D-Confined Nanostructures: Theory and Experiment Open
Heat management is crucial in the design of nanoscale devices as the operating temperature determines their efficiency and lifetime. Past experimental and theoretical works exploring nanoscale heat transport in semiconductors addressed kno…
View article: Nondestructive, high-resolution, chemically specific 3D nanostructure characterization using phase-sensitive EUV imaging reflectometry
Nondestructive, high-resolution, chemically specific 3D nanostructure characterization using phase-sensitive EUV imaging reflectometry Open
A new imaging technique enables nondestructive, 3D characterization of nanostructures, their composition, and interfaces.
View article: Full characterization of ultrathin 5-nm low-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>k</mml:mi></mml:math> dielectric bilayers: Influence of dopants and surfaces on the mechanical properties
Full characterization of ultrathin 5-nm low- dielectric bilayers: Influence of dopants and surfaces on the mechanical properties Open
Ultrathin films and multilayers, with controlled thickness down to single atomic layers, are critical for advanced technologies ranging from nanoelectronics to spintronics to quantum devices. However, for thicknesses less than 10 nm, surfa…
View article: Generation of coherent phonons by coherent extreme ultraviolet radiation in a transient grating experiment
Generation of coherent phonons by coherent extreme ultraviolet radiation in a transient grating experiment Open
We investigate the excitation of coherent acoustic and optical phonons by ultrashort extreme ultraviolet (EUV) pulses produced by a free electron laser. Two crossed femtosecond EUV (wavelength 12.7 nm) pulses are used to excite coherent ph…
View article: Probing thermal and acoustic dynamics of inverse silicon metallatices
Probing thermal and acoustic dynamics of inverse silicon metallatices Open
Journal Article Probing thermal and acoustic dynamics of inverse silicon metallatices Get access C Bevis, C Bevis Department of Physics and JILA, University of Colorado and NIST, Boulder, Colorado, USA Corresponding author: charles.bevis@c…
View article: Full-Field Stroboscopic Imaging of Acoustic and Thermal Dynamics in Isolated Nanostructures Using Tabletop EUV Coherent Imaging
Full-Field Stroboscopic Imaging of Acoustic and Thermal Dynamics in Isolated Nanostructures Using Tabletop EUV Coherent Imaging Open
Understanding the mechanical properties of nanostructured systems is critical for accelerating advances in material, nano and bio sciences, as well as various nanostructured electronic, photovoltaic and thermoelectric devices.However, macr…
View article: Ptychographic Complex Imaging Reflectometry for Spatially-Resolved Dopant Profiling Using a Tabletop EUV Source
Ptychographic Complex Imaging Reflectometry for Spatially-Resolved Dopant Profiling Using a Tabletop EUV Source Open
Journal Article Ptychographic Complex Imaging Reflectometry for Spatially-Resolved Dopant Profiling Using a Tabletop EUV Source Get access Yuka Esashi, Yuka Esashi JILA, University of Colorado, Boulder, Colorado 80309, USA Corresponding au…
View article: Nanoscale transient gratings excited and probed by extreme ultraviolet femtosecond pulses
Nanoscale transient gratings excited and probed by extreme ultraviolet femtosecond pulses Open
Spatially patterned extreme ultraviolet light pulses can be used for probing multiple dynamical processes at the nanoscale.
View article: Engineering Nanoscale Thermal Transport: Size- and Spacing-Dependent Cooling of Nanostructures
Engineering Nanoscale Thermal Transport: Size- and Spacing-Dependent Cooling of Nanostructures Open
Nanoscale thermal transport is becoming ever more technologically important with the development of next-generation nanoelectronics, nanomediated thermal therapies, and high efficiency thermoelectric devices. However, direct experimental m…
View article: Ultrafast dynamic imaging of thermal and acoustic dynamics in nanosystems using a tabletop high harmonic source
Ultrafast dynamic imaging of thermal and acoustic dynamics in nanosystems using a tabletop high harmonic source Open
We demonstrate the first stroboscopic full-field EUV nanoscope using high harmonics. We image the propagation of thermal and surface acoustic waves in nickel with 80nm transverse, 0.5 Å axial, and 10 fs resolution.
View article: Ultra-low thermal conductivity and acoustic dynamics of Si nanostructured metalattices probed using ultrafast high harmonic beams
Ultra-low thermal conductivity and acoustic dynamics of Si nanostructured metalattices probed using ultrafast high harmonic beams Open
We extend optical nanometrology capabilities to smaller dimensions by using tabletop coherent extreme ultraviolet (EUV) beams. Specifically, we characterize thermal transport and acoustic wave propagation in 3D periodic silicon inverse met…
View article: Generation of coherent phonons by coherent extreme ultraviolet radiation in a transient grating experiment
Generation of coherent phonons by coherent extreme ultraviolet radiation in a transient grating experiment Open
We investigate the excitation of coherent acoustic and optical phonons by ultrashort extreme ultraviolet (EUV) pulses produced by a free electron laser. Two crossed femtosecond EUV (wavelength 12.7 nm) pulses are used to excite coherent ph…
View article: Full-field imaging of thermal and acoustic dynamics in an individual nanostructure using tabletop high harmonic beams
Full-field imaging of thermal and acoustic dynamics in an individual nanostructure using tabletop high harmonic beams Open
We built a stroboscopic extreme UV microscope with tabletop high harmonics to make nanoscale movies of thermal and acoustic waves.