Fano meets Stokes: Four-order-of-magnitude enhancement of asymmetric Brillouin light scattering spectra

Special issue introduction: Ultrafast photoacoustics

“…An interesting intermediate situation is presented in the article [4] , in which case a continuous laser is used to detect the interaction with coherent phonons optically generated by ultrashort pump optical pulses. The detected signals are then 3–4 orders of magnitude higher than those detected when there is no pump, i.e., when only spontaneous thermal phonons are detected.…”

Optical polarization perturbed by shear strains of ultrasonic bulk waves in anisotropic semiconductors: Multiphysics modeling and optoacoustic validation

“…In particular, the theory based on the classical coupling effect between the thermodynamics and elasticity [35] , [36] , rigorously describes the mechanism of optoacoustic wave generation in objects of macroscopic scales. When OA characterization-based inspection is extended to objects having microscopic or even smaller scales, the two-temperature model [28] , [30] , [32] , [37] has been proven effect of interpreting the ultrafast (of the order of sub-picosecond) generation of OA waves which are known as hypersound [37] or GHz phonon [30] , [38] . Two-temperature model reveals phonons are generated via the sequential energy transportation from photons, electrons, to phonons, spanning a broad acoustic spectrum ranging from 10 GHz to 1 THz [39] , [40] .…”