Tomographic reconstruction of picosecond acoustic strain pulses using automated angle-scan probing with visible light [PDF]
Photoacoustics, 2023 By means of an ultrafast optical technique, picosecond acoustic strain pulses in a transparent medium are tomographically visualized at GHz frequencies. The strain distribution in BK7 glass is reconstructed from time-domain reflectivity changes of 415-nm
Motonobu Tomoda +4 more
doaj +2 more sources
Towards shaping picosecond strain pulses via magnetostrictive transducers [PDF]
Photoacoustics, 2023 Using time-resolved x-ray diffraction, we demonstrate the manipulation of the picosecond strain response of a metallic heterostructure consisting of a dysprosium (Dy) transducer and a niobium (Nb) detection layer by an external magnetic field. We utilize
Maximilian Mattern +4 more
doaj +2 more sources
Optoacoustic lenses for lateral sub-optical resolution elasticity imaging [PDF]
PhotoacousticsIn this paper, we demonstrate for the first time the focusing of gigahertz coherent phonon pulses propagating in water using picosecond ultrasonics and Brillouin light scattering. We achieve this by using planar Fresnel zone plate and concave lenses with
Mengting Yao +5 more
doaj +2 more sources
Parallel imaging with phonon microscopy using a multi-core fibre bundle detection [PDF]
Photoacoustics, 2023 In this paper, we show a proof-of-concept method to parallelise phonon microscopy measurements for cell elasticity imaging by demonstrating a 3-fold increase in acquisition speed which is limited by current acquisition hardware.
Rafael Fuentes-Domínguez +7 more
doaj +2 more sources
Evaluation of Optical and Acoustical Properties of Ba1−xSrxTiO3 Thin Film Material Library via Conjugation of Picosecond Laser Ultrasonics with X-ray Diffraction, Energy Dispersive Spectroscopy, Electron Probe Micro Analysis, Scanning Electron and Atomic Force Microscopies [PDF]
Nanomaterials, 2021 Wide-range continuous spatial variation of the film composition in lateral compositionally graded epitaxial films requires the development of high throughput measurement techniques for their local and non-destructive characterization with the highest ...
Sathyan Sandeep +7 more
doaj +2 more sources
Experimental and numerical study of Conoscopic Interferometry sensitivity for optimal acoustic pulse detection in ultrafast acoustics [PDF]
Photoacoustics, 2023 Conoscopic interferometry is a promising detection technique for ultrafast acoustics. By focusing a probe beam through a birefringent crystal before passing it through a polarizer, conoscopic interferences sculpt the spatial profile of the beam.
Martin Robin +5 more
doaj +2 more sources
Simultaneous extraction of photoelastic constants and strain profiles from picosecond ultrasonic echoes via spectral analysis [PDF]
PhotoacousticsWe present an echo spectral analysis method for picosecond ultrasonics that allows simultaneous determination of the complex photoelastic constant of an opaque isotropic thin film and its acoustic strain profile directly from optical pump–probe ...
Motonobu Tomoda +5 more
doaj +2 more sources
Refraction, beam splitting and dispersion of GHz surface acoustic waves by a phononic crystal [PDF]
Photoacoustics, 2023 We exploit a time-resolved ultrafast optical technique to study the propagation of point-excited surface acoustic waves on a microscopic two-dimensional phononic crystal in the form of a square lattice of holes in a silicon substrate.
Osamu Matsuda +5 more
doaj +2 more sources
Time-domain Brillouin scattering theory for probe light and acoustic beams propagating at an angle and acousto-optic interaction at material interfaces [PDF]
Photoacoustics, 2023 A theory has been developed to interpret time-domain Brillouin scattering (TDBS) experiments involving coherent acoustic pulse (CAP) and light pulse beams propagating at an angle to each other.
Vitalyi E. Gusev +3 more
doaj +2 more sources
Time-domain Brillouin scattering for evaluation of materials interface inclination: Application to photoacoustic imaging of crystal destruction upon non-hydrostatic compression [PDF]
Photoacoustics, 2023 Time-domain Brillouin scattering (TDBS) is a developing technique for imaging/evaluation of materials, currently used in material science and biology. Three-dimensional imaging and characterization of polycrystalline materials has been recently reported,
Sathyan Sandeep +8 more
doaj +2 more sources