Phonon attenuation in glasses studied by picosecond ultrasonics

Morath, Christopher J.; Tas, Guray; Zhu, Timothy C.; Maris, Humphrey J.

doi:10.1016/0921-4526(95)00725-3

Cited by 18 publications

(6 citation statements)

References 5 publications

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“…Namely, we probe the damping of acoustic phonon modes (e.g., picosecond acoustics) in the solid layer upon interaction with the solid/liquid interface. This measurement allows for optical detection of the propagation of acoustic modes through the piezo-optic effect of energy coupling between the solid film and contacting layers ,, and can be applied outside of thin Au films, as demonstrated in various material systems including polymers and other amorphous materials, ,− semiconductors, − and superlattices. , The time-dependent intensity of these picosecond acoustic signals can be described via where A , B , and δ are scaling factors, Γ is the damping due to interfacial energy transfer, T is the period of the pressure front, and the second term, exp(− t /τ), accounts for the thermal decay rather than the signal associated with the acoustics. Fitting this equation to the picosecond acoustic signal over the first nanosecond provides us with two important variables: the period, T , and damping, Γ, of the acoustic modes.…”

Section: Picosecond Acoustics To Quantify Phonon Transmissionmentioning

confidence: 99%

Nanoscale Wetting and Energy Transmission at Solid/Liquid Interfaces

et al. 2019

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Understanding the effects and limitations of solid/liquid interfaces on energy transport is crucial to applications ranging from nanoscale thermal engineering to chemical synthesis. Until now, the majority of experimental evidence regarding solid/liquid interactions has been limited to macroscale observations and experiments. The lack of experimental works exploring nanoscale solid/liquid interactions has been accentuated as the body of knowledge from theory and simulations at these scales has exploded in recent years. In this study, we expand on current nanoscale thermal measurement techniques in order to more fully understand solid/liquid interfacial energy transport. We use thermal ablation threshold measurements on thick Au films in various liquids as a metric to describe thermal transport at the Au/liquid interface. Furthermore, using ultrafast pump–probe experiments, we gain insight into this transport through picosecond ultrasonic coupling at solid/liquid interfaces with known macroscopic observations. We find significant variations in both the ablation threshold and the damping of the acoustic modes within the Au films depending on nanoscopic interactions at the solid/liquid interface rather than typical macroscale metrics such as acoustic mismatch, measured contact angle, and work of adhesion.

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Section: Picosecond Acoustics To Quantify Phonon Transmissionmentioning

confidence: 99%

Nanoscale Wetting and Energy Transmission at Solid/Liquid Interfaces

et al. 2019

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“…Our front-back pump-probe setup was based on the common picosecond ultrasonics approach based on TDBS [24][25][26][27]. Absorption of an optical pump pulse and subsequent rapid thermal expansion launched the longitudinal acoustic wavepacket into the sample.…”

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confidence: 99%

“…After the sample was assembled, it was transferred to a cryostat, and the sample chamber was immediately evacuated. Our frontback pump-probe setup was based on the common picosecond ultrasonics approach with TDBS detection [24][25][26][27]. …”

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confidence: 99%

Nonlinear Acoustics at GHz Frequencies in a Viscoelastic Fragile Glass Former

et al. 2015

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Using a picosecond pump-probe ultrasonic technique, we study the propagation of high-amplitude, laser-generated longitudinal coherent acoustic pulses in the viscoelastic fragile glass former DC704. We observe an increase of almost 10% in acoustic pulse propagation speed at the highest optical pump fluence which is a result of the supersonic nature of nonlinear propagation in the viscous medium. From our measurement, we deduce the nonlinear acoustic parameter of the glass former in the gigahertz frequency range across the glass transition temperature. DOI: 10.1103/PhysRevLett.114.065701 PACS numbers: 64.70.P-, 62.50.-p, 62.60.+v The observation of laser-driven shock wave propagation provides direct experimental access to the equations of state of strongly compressed materials. This information is of paramount importance for geophysics, astrophysics [1], and inertial confinement fusion [2]. For many years, measurements of shock velocities have been possible through transit time measurements [3]. Only recently, single-shot optical velocity interferometry [2,4-9] allowed direct access to the dynamics of shock front motion in transparent solids but has been restricted to experimental configurations where the shock transforms the medium into a new, highly reflecting phase. Through this technique, the decay of both plane [4,7] and convergent [9,10] shocks with pressures exceeding tens of GPa have been reported. The propagation of shock waves in soft transparent materials such as polycarbonate and PMMA has been observed by single-shot ultrafast dynamic ellipsometry [11,12], a method allowing the separation of pressureinduced variations in elastic and optical properties. In such materials, characteristic pressures ranged from a few to 10-20 GPa, and acoustic Mach numbers defined as M A ¼ u=v 0 , where u is the particle velocity and v 0 the linear acoustic velocity, were subsonic in the range 0.2 < M A < 0.9. Very recently, the propagation of weak shock waves with Mach numbers M A < 0.1 and pressures below the damage threshold of the sample has been observed in thin sapphire slabs through ultrafast optical reflectivity [13], in a 4:1 methanol-ethanol mixture in a diamond anvil cell by ultrafast velocity interferometry [14], in a piezoelectric thin film through terahertz spectroscopy [15], and in a gold film through ultrafast plasmon interferometry [16] and ultrafast optical imaging [17]. In such weakly nonlinear acoustics experiments [18], no variation of the weak shock wave velocity during propagation has been reported to date. In a different manner, an indication for the nonlinearity of picosecond acoustic pulses with Mach numbers 0.0007 < M A < 0.0018 and their decay within 1-3 mm propagation distances has been observed by classical Brillouin spectroscopy [19] through measurement of the distribution of 22 GHz longitudinal phonons along the acoustic pulse trajectory. In such experiments, information on wide-frequency-band nonlinear waves is obtained from the spatial distribution of a single Brillouin frequency compo...

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“…Picosecond ultrasonics is a technique, developed in the mid-1980s, in which ultrashort laser pulses are used to generate and detect acoustic waves with very short wavelength, typically in a nanometer range [1]. Established applications of the method include the determination of elastic parameters [2][3][4][5][6][7][8][9], acoustic damping properties [10][11][12][13][14][15], structural properties [16][17][18][19], interface adhesion and coupling [20][21][22][23] and imaging of embedded layers [24][25][26][27][28][29]. Ultrafast acoustic dynamics were studied in metals [6,21,[30][31][32][33][34][35], semiconductors [10,[36][37][38][39], dielectric materials [11,14,16,40] and polymers [41]…”

Section: Introductionmentioning

confidence: 99%

“…Established applications of the method include the determination of elastic parameters [2][3][4][5][6][7][8][9], acoustic damping properties [10][11][12][13][14][15], structural properties [16][17][18][19], interface adhesion and coupling [20][21][22][23] and imaging of embedded layers [24][25][26][27][28][29]. Ultrafast acoustic dynamics were studied in metals [6,21,[30][31][32][33][34][35], semiconductors [10,[36][37][38][39], dielectric materials [11,14,16,40] and polymers [41][42][43][44]. Recent developments have also shown the feasibility to ap...…”

Section: Introductionmentioning

confidence: 99%

Picosecond ultrasonics with a free-running dual-comb laser

Pupeikis

Willenberg

Bart

et al. 2022

Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XXII

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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. With a high-sensitivity pump-probe setup, we apply this free-running dual-comb laser to picosecond ultrasonic measurements. The ultrasonic signatures in a semiconductor multi-quantum-well structure originating from the quantum wells and superlattice regions are revealed and discussed. We further demonstrate ultrasonic measurements on a thin-film metalized sample and compare these measurements to ones obtained with a pair of locked femtosecond lasers. Our data show that a free-running dual-comb laser is well-suited for picosecond ultrasonic measurements and thus it offers a significant reduction in complexity and cost for this widely adopted non-destructive testing technique.

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Phonon attenuation in glasses studied by picosecond ultrasonics

Cited by 18 publications

References 5 publications

Nanoscale Wetting and Energy Transmission at Solid/Liquid Interfaces

Nanoscale Wetting and Energy Transmission at Solid/Liquid Interfaces

Nonlinear Acoustics at GHz Frequencies in a Viscoelastic Fragile Glass Former

Picosecond ultrasonics with a free-running dual-comb laser

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