Coherent phonons can be launched in materials upon localized pulsed optical excitation,
and be subsequently followed in time-domain, with a sub-picosecond resolution, using a …

The aim of this article is to provide an introduction to picosecond laser ultrasonics, a means
by which gigahertz–terahertz ultrasonic waves can be generated and detected by ultrashort …

Thanks to ultrafast acoustics, a better understanding of acoustic dynamics on a short time
scale has been obtained and new characterization methods at the nanoscale have been …

Novelty detection has been presented in the literature as one-class problem. In this case,
new examples are classified as either belonging to the target class or not. The examples not …

Coherent acoustic phonons are generated at terahertz frequencies when semiconductor
quantum-well nanostructures are illuminated by femtosecond laser pulses,,,,,,,,. These …

We report measurements of room-temperature mean free paths of long-lived THz acoustic
phonons in wurtzite GaN. Longitudinal phonon wave packets are excited and probed by …

Phonon dispersion in crystals determines many important material properties, but its
measurement usually requires large-scale facilities and is limited to bulk samples. Here, we …

Practically, graphene is often deposited on substrates. Given the major substrate-induced
modification of properties and considerable energy transfer at the interface, the graphene …

We utilized transmission-type pump–probe technique to investigate coherent acoustic
phonons in the superlattices of perovskite oxides such as SrIrO 3/SrTiO 3 and SrRuO …

Picosecond ultrasonic laser sonar (PULSE), one of the noninvasive technologies with a high
thickness sensitivity, is capable of probing multilayer films directly on the production wafers …