Spectral analysis of amplitude and phase echoes in picosecond ultrasonics for strain pulse shape determination [PDF]
Photoacoustics, 2023 We introduce a spectral analysis method in picosecond ultrasonics to derive strain pulse shapes in an opaque sample with known optical properties. The method makes use of both the amplitude and phase of optical transient relative reflectance changes ...
Takehiro Tachizaki +2 more
exaly +4 more sources
Concepts and use cases for picosecond ultrasonics with x-rays [PDF]
Photoacoustics, 2023 This review discusses picosecond ultrasonics experiments using ultrashort hard x-ray probe pulses to extract the transient strain response of laser-excited nanoscopic structures from Bragg-peak shifts.
Maximilian Mattern +5 more
doaj +7 more sources
Surface plasmon-based detection for picosecond ultrasonics in planar gold-dielectric layer geometries [PDF]
Photoacoustics, 2023 Longitudinal acoustic modes in planar thin gold films are excited and detected by a combination of ultrafast pump-probe photoacoustic spectroscopy and a surface plasmon resonance (SPR) technique.
F. Noll +4 more
doaj +2 more sources
Effect of surface plasmon on optical detection of picosecond ultrasonic pulses generated in aluminum nanofilms [PDF]
Photoacoustics, 2023 Photoacoustic and thermoacoustic detection methods, including picosecond ultrasonic laser sonar based on metallic thin films, are widely used in industrial applications for their noninvasiveness.
Ting-Shan Lee, Chi-Kuang Sun
doaj +2 more sources
Sound velocity mapping from GHz Brillouin oscillations in transparent materials by optical incidence from the side of the sample [PDF]
Photoacoustics, 2023 Time-domain Brillouin scattering (TDBS) is an all-optical experimental technique for investigating transparent materials based on laser picosecond ultrasonics. Its application ranges from imaging thin-films, polycrystalline materials and biological cells
Motonobu Tomoda +4 more
doaj +2 more sources
Imaging phonon eigenstates and elucidating the energy storage characteristics of a honeycomb-lattice phononic crystal cavity [PDF]
Photoacoustics, 2023 We extend gigahertz time-domain imaging to a wideband investigation of the eigenstates of a phononic crystal cavity. Using omnidirectionally excited phonon wave vectors, we implement an ultrafast technique to experimentally probe the two-dimensional ...
P.H. Otsuka +10 more
doaj +2 more sources
Picosecond ultrasonics with miniaturized semiconductor lasers [PDF]
Ultrasonics, 2020 There is a great desire to extend ultrasonic techniques to the imaging and characterization of nanoobjects. This can be achieved by picosecond ultrasonics, where by using ultrafast lasers it is possible to generate and detect acoustic waves with frequencies up to terahertz and wavelengths down to nanometers.
Marc Sorel +2 more
exaly +8 more sources
Non-contact and label-free biomechanical imaging: Stimulated Brillouin microscopy and beyond [PDF]
Frontiers in Physics, 2023 Brillouin microscopy based on spontaneous Brillouin scattering has emerged as a unique elastography technique because of its merit of non-contact, label-free, and high-resolution mechanical imaging of biological cell and tissue.
Chenjun Shi, Hongyuan Zhang, Jitao Zhang
doaj +2 more sources
Time-domain Brillouin imaging of sound velocity and refractive index using automated angle scanning [PDF]
Photoacoustics, 2023 We present a picosecond optoacoustic technique for mapping both the longitudinal sound velocity v and the refractive index n in solids by automated measurement at multiple probe incidence angles in time-domain Brillouin scattering.
Motonobu Tomoda +4 more
doaj +2 more sources
Probing gigahertz coherent acoustic phonons in TiO2 mesoporous thin films [PDF]
Photoacoustics, 2023 Ultrahigh-frequency acoustic-phonon resonators usually require atomically flat interfaces to avoid phonon scattering and dephasing, leading to expensive fabrication processes, such as molecular beam epitaxy. Mesoporous thin films are based on inexpensive
E.R. Cardozo de Oliveira +9 more
doaj +2 more sources