SEARCH · Engineering Papers
Results for “PHONONS”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Optical Imaging of Ultrafast Phonon-Polariton Propagation through an Excitonic Sensor
Not provided.
Superior Phonon-Limited Exciton Mobility in Lead-Free Two-Dimensional Perovskites
Not provided.
Effects of Boron Doping on the Bulk and Surface Acoustic Phonons in Single-Crystal Diamond
Not provided.
Detrimental Increase of Spin-Phonon Coupling in Molecular Qubits on Substrates
Not provided.
Localizing Low-Grade Heat Using Hybrid Photonic-Phononic Materials
Creating next-generation devices capable of transducing waste heat into useful work will require building blocks designed to direct low-grade thermal energy at length scales well below the diffraction limit. Characterizing thermally induced energy transfer at the nanoscale, however, is a formidable task due to the simultaneous demand of high spatial and spectral resolution at infrared energies. Leveraging recent advancements in electron energy loss (EEL) and gain (EEG) spectroscopy, we reveal that individual nanostructures can concentrate energy by the resonant thermal excitation of their photonic Fabry–Pérot modes. Specifically, we show that the spatially localized gain signal increases upon in situ heating. Finally, theoretical modeling elucidates the mechanism for these observations by showing that a Purcell enhancement in the local photonic density of states drives the increased rate of infrared energy transfer from the ambient environment to each nanostructure.
Block Copolymer Self-Assembly-Directed and Transient Laser Heating-Enabled Nanostructures toward Phononic and Photonic Quantum Materials
Explore the source record for details and available documents.
Narrow Intrinsic Line Widths and Electron–Phonon Coupling of InP Colloidal Quantum Dots
Not provided.
Imaging Strongly Coupled Plasmon–Phonon Modes in Mid-Infrared Double Antennas
Not provided.
Towards single-chip radiofrequency signal processing via acoustoelectric electron–phonon interactions
Abstract The addition of active, nonlinear, and nonreciprocal functionalities to passive piezoelectric acoustic wave technologies could enable all-acoustic and therefore ultra-compact radiofrequency signal processors. Toward this goal, we present a heterogeneously integrated acoustoelectric material platform consisting of a 50 nm indium gallium arsenide epitaxial semiconductor film in direct contact with a 41° YX lithium niobate piezoelectric substrate. We then demonstrate three of the main components of an all-acoustic radiofrequency signal processor: passive delay line filters, amplifiers, and circulators. Heterogeneous integration allows for simultaneous, independent optimization of the piezoelectric-acoustic and electronic properties, leading to the highest performing surface acoustic wave amplifiers ever developed in terms of gain per unit length and DC power dissipation, as well as the first-ever demonstrated acoustoelectric circulator with an isolation of 46 dB with a pulsed DC bias. Finally, we describe how the remaining components of an all-acoustic radiofrequency signal processor are an extension of this work.
Author Correction: Highly confined epsilon-near-zero and surface phonon polaritons in SrTiO 3 membranes
Correction to: Nature Communicationshttps://doi.org/10.1038/s41467-024-47917-x, published online 04 June 2024 In this article the grant number #200020_201096 relating to the Swiss National Science Foundation was omitted. The original article has been corrected.
Broadband optical phonon scattering reduces the thermal conductivity of multi-cation oxides
Not Available
Unfolding the complexity of phonon quasi-particle physics in disordered materials
Not Available