Study of phonon propagation in water using picosecond ultrasonics

Yang, Fan; Atay, T; Dang, Cuong; Grimsley, T J; Che, Shan; Ma, Jingwen; Zhang, Q; Nurmikko, A. V.; Maris, Humphrey J.

doi:10.1088/1742-6596/92/1/012024

Cited by 8 publications

(4 citation statements)

References 5 publications

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“…2c ): (1) an initial rise in amplitude (blind zone) which occurs as the initially clipped wavelet begins to sample the TRBS signal, followed by (2) a slow amplitude decay owing primarily to the acoustic attenuation rate in water, = 0.30 ± 0.06 μm −1 , which was measured by fitting to an exponential function (Fig. 2c , green curve) and agrees with literature 42 . (3) If a boundary is present (Fig.…”

Section: Methodssupporting

confidence: 87%

“…In particular, moving to a longer phonon wavelength (by using a longer probe wavelength) will increase the range significantly since the signal attenuation is proportional to the square of the phonon frequency f B 2 (ref. 42 ). For instance, using a probe wavelength of λ probe = 1550 nm would improve the nominal depth-measurement range to z DR > 20 μm.…”

Section: Resultsmentioning

confidence: 99%

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Phonon imaging in 3D with a fibre probe

et al. 2021

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We show for the first time that a single ultrasonic imaging fibre is capable of simultaneously accessing 3D spatial information and mechanical properties from microscopic objects. The novel measurement system consists of two ultrafast lasers that excite and detect high-frequency ultrasound from a nano-transducer that was fabricated onto the tip of a single-mode optical fibre. A signal processing technique was also developed to extract nanometric in-depth spatial measurements from GHz frequency acoustic waves, while still allowing Brillouin spectroscopy in the frequency domain. Label-free and non-contact imaging performance was demonstrated on various polymer microstructures. This singular device is equipped with optical lateral resolution, 2.5 μm, and a depth-profiling precision of 45 nm provided by acoustics. The endoscopic potential for this device is exhibited by extrapolating the single fibre to tens of thousands of fibres in an imaging bundle. Such a device catalyses future phonon endomicroscopy technology that brings the prospect of label-free in vivo histology within reach.

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Section: Methodssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Phonon imaging in 3D with a fibre probe

et al. 2021

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“…The damping time of 352 ps deduced from Figure b corresponds to an optical penetration depth of 0.53 μm, which corresponds well to the exponential optical penetration depth of the IR pulse at 3350 cm –1 in water (0.6 μm) (the difference may be explained by an additional contribution to the damping by the broadening of the wavefront of the acoustic strain pulse). The broadening of the wavefront (which would be responsible for damping in case E 2 SFG ≫ E 3 SFG ) is expected to occur on longer (∼nanoseconds) time scales, as has been shown with linear reflectivity experiments …”

Section: Discussionmentioning

confidence: 74%

Gigahertz Modulation of Femtosecond Time-Resolved Surface Sum-Frequency Generation Due to Acoustic Strain Pulses

et al. 2014

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We study the properties of aqueous solution/air interfaces with time-resolved surface sum-frequency generation (SFG) spectroscopy. Using this technique, we monitor the change in SFG signal following the excitation of the water hydroxyl stretch vibrations with a strong ultrashort infrared pump pulse. We observe that, in addition to the excitation-induced changes in the signal resulting from vibrational excitation and relaxation on a time scale of picoseconds, the infrared excitation also induces a modulation of the SFG signal with a period of ∼180 ps. This modulation is caused by the interference between the SFG field directly radiated away from the air/liquid interface and the SFG field reflected or generated at the acoustic strain wavefront that is created by the infrared excitation pulse. The modulation is observed to be much stronger for aqueous salt solutions than for pure water, and the phase of the oscillations depends on the nature of the dissolved salt. This dependence of the phase can be explained from the differences in surface propensities of the ions of the different salts, giving rise to different net orientation of the interfacial water species.

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“…α scales quadratically with the frequency, i.e. α/ν 2 = 19 x 10 -15 sec 2 /m at 30 °C 74 . At a frequency of 10…”

Section: Discussionmentioning

confidence: 99%

Caught in the act: Observation of the solvent response triggered by excited-state proton transfer in real time

Hoberg

Ockelmann

Shee

et al. 2021

Preprint

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Real-time observation of the solvent response following Excited State Proton Transfer (ESPT) of the photoacid HPTS into water using Optical Pump THz Probe (OPTP) spectroscopy from 0.1 ps up to 300 ps is reported. Subsequent to an instantaneous (< 0.2 ps) electronic response of the solute to photoexcitation, an oscillation with a period of 4 ps involving an intermolecular H (pyranine) - O (water) mode is observed. While for the methylated derivative, MPTS, and the deprotonated photoacid this oscillation relaxes on a time scale of 1.5 – 2 ps, for HPTS the oscillation decays more rapidly within 0.4 ps, which marks the onset of proton transfer. Energy transfer from the excited solute to the solvent takes place on a time scale of 120 ps and is proportional to the Stokes shift associated with energetic relaxation from the Franck-Condon region to the ground state of the photoexcited HPTS.

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Study of phonon propagation in water using picosecond ultrasonics

Cited by 8 publications

References 5 publications

Phonon imaging in 3D with a fibre probe

Phonon imaging in 3D with a fibre probe

Gigahertz Modulation of Femtosecond Time-Resolved Surface Sum-Frequency Generation Due to Acoustic Strain Pulses

Caught in the act: Observation of the solvent response triggered by excited-state proton transfer in real time

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