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
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
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
Looking Inside Micro- and Nano-Mechanical Pillar Resonators: A Picosecond Ultrasonics Approach
Proceedings, 2020 Pillar-shaped Gallium arsenide (GaAs) micromechanical resonators are fabricated, and the feasibility to measure the inside of the pillars in the axial direction with laser-induced GHz ultrasound based on picosecond ultrasonics is tested.
Paul Stritt +5 more
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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
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
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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
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Picosecond ultrasonics with a free-running dual-comb laser. [PDF]
Optics Express, 2021 We present a free-running 80-MHz dual-comb polarization-multiplexed solid-state laser which delivers 1.8 W of average power with 110-fs pulse duration per comb.
J. Pupeikis +12 more
semanticscholar +5 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
Fundamentals of picosecond laser ultrasonics [PDF]
Ultrasonics, 2015 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 light pulses. This method can be used to characterize materials with nanometer spatial resolution.
Osamu Matsuda +2 more
exaly +3 more sources