Halide perovskites (HPs) are potential game-changing materials for a broad spectrum of
optoelectronic applications ranging from photovoltaics, light-emitting devices, lasers to …

In this review we address the microscopic mechanisms that are involved in the
photogeneration processes of GHz–THz coherent acoustic phonons (CAP) induced by an …

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 …

Understanding and controlling vibrations in condensed matter is emerging as an essential
necessity both at fundamental level and for the development of a broad variety of …

Generation of strain using light is a key issue for future development of ultrasonic devices.
Up to now, photo-induced GHz–THz acoustic phonons have been mainly explored in metals …

We apply ultrafast x-ray diffraction with femtosecond temporal resolution to monitor the
lattice dynamics in a thin film of multiferroic BiFeO 3 after above-band-gap photoexcitation …

Using femtosecond laser pulses, coherent GHz acoustic phonons are efficiently
photogenerated and photodetected in BiFeO 3 (BFO) multiferroic single crystal. Due to the …

Picosecond strain pulses are a versatile tool for investigation of mechanical properties of
meso-and nano-scale objects with high temporal and spatial resolutions. Generation of such …

In this article we first present the foundations of ultrafast photoacoustics, a technique where
the acoustic wavelength in play can be considerably shorter than the optical wavelength …

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 …