Femtosecond imaging of nonlinear acoustics in gold

Pézeril, Thomas; Klieber, Christoph; Shalagatskyi, Viktor; Vaudel, G.; Temnov, Vasily V.; Schmidt, Oliver G.; Makarov, Denys

doi:10.1364/oe.22.004590

Cited by 16 publications

(10 citation statements)

References 42 publications

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“…to a larger number of scans and more pixels per image), improvement in the signal-to-noise ratio through increased averaging at a particular measurement point, and a decrease in maximum thermal and optical loadings of the samples. The ASOPs technique 73,83,84 has already been applied for TDBS imaging [50][51] , while multichannel 115 and wide-field 116 systems have not yet seen experimental application. Also from the technical point of view, samples for TDBS imaging could be prepared in such a way that most of the spurious signals degrading the TDBS signal, such as contributions to transient reflectivity caused by photo-excitation of the optoacoustic transducer, are suppressed.…”

Section: Nonlinear Transformation Of Coherent Nano-acoustic Pulsesmentioning

confidence: 99%

Advances in applications of time-domain Brillouin scattering for nanoscale imaging

Gusev

Ruello

2018

Applied Physics Reviews

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Time-domain Brillouin scattering is an all-optical experimental technique based on ultrafast lasers applied for generation and detection of coherent acoustic pulses on time durations of picoseconds and length scales of nanometers. In transparent materials scattering of the probe laser beam by the coherent phonons permits imaging of sample inhomogeneity. The transient optical reflectivity of the sample recorded by the probe beam as the acoustic nanopulse propagates in space contains information on the acoustical, optical, and acousto-optical parameters of the material under study. The experimental method is based on a heterodyning where weak light pulses scattered by the coherent acoustic phonons interfere at the photodetector with probe light pulses of significantly higher amplitude reflected from various interfaces of the sample. The time-domain Brillouin scattering imaging is based on Brillouin scattering and has the potential to provide all the information that researchers in material science, physics, chemistry, biology etc., get with classic frequency-domain Brillouin scattering of light. It can be viewed as a replacement for Brillouin scattering and Brillouin microscopy in all investigations where nanoscale spatial resolution is either required or advantageous. Here we review applications of time-domain Brillouin scattering for imaging of nanoporous films, ion-implanted semiconductors and dielectrics, texture in polycrystalline materials and inside vegetable and animal cells, and for monitoring the transformation of 2nanosound caused by nonlinearity and focusing. We also discuss the perspectives and the challenges for the future.I.

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Section: Nonlinear Transformation Of Coherent Nano-acoustic Pulsesmentioning

confidence: 99%

Advances in applications of time-domain Brillouin scattering for nanoscale imaging

Gusev

Ruello

2018

Applied Physics Reviews

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“…) of materials except for Ni, Cr, and Au at specified wavelengths 28,29 . Instead, as a circumvention, ηqss(t) was obtained without introducing unknown coefficients by solving the one-dimensional wave equation incorporating the lattice temperature profile used as a driving source (see the strain calculation and parameter values in Methods for more details).…”

Section: Resultsmentioning

confidence: 99%

Quasi-Static Strain Governing Ultrafast Spin Dynamics

Shin¹,

Vomir²,

Kim³

et al. 2021

Preprint

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The quasi-static strain (QSS) is the product induced by the lattice thermal expansion after ultrafast photo-excitation. Although the QSS and thermal effects are barely distinguishable in time, they should be treated separately because of their different fundamental actions to ultrafast spin dynamics. By employing ultrafast Sagnac interferometry and the magneto-optical Kerr effect, we demonstrate quantitatively the existence of QSS and the decoupling of two effects counteracting each other in typical polycrystalline Co and Ni films. The Landau-Lifshitz-Gilbert and Kittel equations considering a magnetoelastic energy term showed that QSS, rather than the thermal energy, in ferromagnets plays a governing role in ultrafast spin dynamics. This demonstration provides an essential way to analyze ultrafast photo-induced phenomena.

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“…Picosecond and femtosecond lasers have been adopted successfully for material characterization such as exploring acoustic features on the nanoscale [ 124 , 125 , 126 ], acoustic imaging in thin films and microstructures on opaque substrates [ 123 , 124 , 127 , 128 , 129 ], material properties measurement of thin film [ 130 ], measurement of switching activity (changes of signal values) [ 131 ], and non-destructive evaluation of micrometric diamond films [ 120 ]. The duration of the laser pulse can be tuned to produce acoustic wavelength as short as 5 nm and provide volumetric information about the structure they travel in [ 123 , 124 ].…”

Section: Ndt Methods For Ic Packagingmentioning

confidence: 99%

An Overview of Non-Destructive Testing Methods for Integrated Circuit Packaging Inspection

Aryan

Sampath

Sohn

2018

Sensors

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The article provides a review of the state-of-art non-destructive testing (NDT) methods used for evaluation of integrated circuit (IC) packaging. The review identifies various types of the defects and the capabilities of most common NDT methods employed for defect detection. The main aim of this paper is to provide a detailed review on the common NDT methods for IC packaging addressing their principles of operation, advantages, limitations and suggestions for improvement. The current methods such as, X-ray, scanning acoustic microscopy (SAM), infrared thermography (IRT), magnetic current imaging (MCI) and surface acoustic waves (SAW) are explicitly reviewed. The uniqueness of the paper lies in comprehensive comparison of the current NDT methods, recommendations for the improvements, and introduction of new candidate NDT technologies, which can be adopted for IC packaging.

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Femtosecond imaging of nonlinear acoustics in gold

Cited by 16 publications

References 42 publications

Advances in applications of time-domain Brillouin scattering for nanoscale imaging

Advances in applications of time-domain Brillouin scattering for nanoscale imaging

Quasi-Static Strain Governing Ultrafast Spin Dynamics

An Overview of Non-Destructive Testing Methods for Integrated Circuit Packaging Inspection

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