title: Transient crystalline superlattice generated by a photoacoustic transducer.
abstract: Designing an efficient and simple method for modulating the intensity of x-ray radiation on a picosecond time-scale has the potential to produce ultrafast pulses of hard x-rays. In this work, we generate a tunable transient superlattice, in an otherwise perfect crystal, by photoexciting a metal film on a crystalline substrate. The resulting transient strain has amplitudes approaching 1%, wavevectors greater than [Formula: see text], and lifetimes approaching 1 ns. This method has the potential to generate isolated picosecond x-ray bursts with scattering efficiencies in excess of 10%.
authors.affiliation: Department of Physics and Astronomy, University of Delaware , Newark, Delaware 19716, USA.
authors.forename: A
authors.initials: A
authors.lastname: Loether
authors.forename: Y
authors.initials: Y
authors.lastname: Gao
authors.affiliation: Department of Physics and Astronomy, University of Delaware , Newark, Delaware 19716, USA.
authors.forename: Z
authors.initials: Z
authors.lastname: Chen
authors.affiliation: Department of Physics and Astronomy, University of Delaware , Newark, Delaware 19716, USA.
authors.forename: M F
authors.initials: MF
authors.lastname: DeCamp
authors.affiliation: Argonne National Laboratory , Argonne, Illinois 60439, USA.
authors.forename: E M
authors.initials: EM
authors.lastname: Dufresne
authors.affiliation: Argonne National Laboratory , Argonne, Illinois 60439, USA.
authors.forename: D A
authors.initials: DA
authors.lastname: Walko
authors.affiliation: Argonne National Laboratory , Argonne, Illinois 60439, USA.
authors.forename: H
authors.initials: H
authors.lastname: Wen