Picosecond ultrasonic study of surface acoustic waves on periodically patterned layered nanostructures

Colletta, Michael; Gachuhi, Wanjiru; Gartenstein, Samuel; James, Molly; Szwed, Erik; Daly, Brian C.; Cui, Weili; Antonelli, G. A.

doi:10.1016/j.ultras.2018.02.013

Cited by 7 publications

(8 citation statements)

References 21 publications

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“…Antonelli et al 7,8 have demonstrated the intrinsic complexity of the acoustics in 1D metallic nonmagnetic gratings, showing that both lateral periodicity Λ and thickness d of metal stripes are important parameters, giving rise to complex spectra of hybridized acoustic eigenmodes for d ≈ Λ. 16 In the present work, we extend these studies to ferromagnetic and magnetostrictive 1D nickel gratings. A recent magnetoacoustic study performed on unstructured ferromagnetic Ni thin films excited in the transient grating (TG) geometry evidenced the generation of surface acoustic modes and their resonant interactions with the FMR precession.…”

supporting

confidence: 58%

“…17 The extension of this work to metasurfaces with smaller Λ ≈ d is expected to achieve the previously inaccessible regime of magnetoelastic dynamics driven by exotic Sezawa modes. 11,16 The latter should be good candidates to excite standing modes of exchange magnons across the film thickness 30−33 and magnetoelastically coupling them in more complex magnetic multilayer structures, 34 notably on low-loss silicon substrates supporting phonon-magnon resonances up to THz frequencies. 35 Moreover, the study could be extended to nickel gratings deposited on freestanding silicon membranes 22 supporting long-lived guided Lamb modes.…”

mentioning

confidence: 99%

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Quantitative Ultrafast Magnetoacoustics at Magnetic Metasurfaces

Alekhin,

Lomonosov,

Leo

et al. 2023

Nano Lett.

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Femtosecond (fs) time-resolved magneto-optics is applied to investigate laser-excited ultrafast dynamics of onedimensional nickel gratings on fused silica and silicon substrates for a wide range of periodicities Λ = 400−1500 nm. Multiple surface acoustic modes with frequencies up to a few tens of GHz are generated. Nanoscale acoustic wavelengths Λ/n have been identified as n th -spatial harmonics of Rayleigh surface acoustic wave (SAW) and surface skimming longitudinal wave (SSLW), with acoustic frequencies and lifetimes being in agreement with theoretical calculations. Resonant magnetoelastic excitation of the ferromagnetic resonance (FMR) by SAW's third spatial harmonic, and, most interestingly fingerprints of the parametric resonance at 1/2 SAW frequency have been observed. Numerical solutions of Landau−Lifshitz−Gilbert (LLG) equation magnetoelastically driven by complex polychromatic acoustic fields quantitatively reproduce all resonances at once. Thus, our results provide a solid experimental and theoretical base for a quantitative understanding of ultrafast fs-laser-driven magnetoacoustics and tailoring the magnetic-gratingbased metasurfaces at the nanoscale.

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confidence: 58%

mentioning

confidence: 99%

Quantitative Ultrafast Magnetoacoustics at Magnetic Metasurfaces

Alekhin,

Lomonosov,

Leo

et al. 2023

Nano Lett.

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“…Due to these high-frequency acoustic waves, we measure oscillatory changes of the reflection on the order of 1%. Analysis of these oscillations and their respective frequencies suggest that we observe multiple types of acoustic waves, three of which we identify as longitudinal waves (LWs) [3,27,28], surface waves [3,[48][49][50][51], and grating line quasi-NM oscillations [50,52,53]. We find that the phase of the LWs and the grating line NMs experiences a π phase shift when the wavelength is tuned around the SPP resonance wavelength.…”

Section: Introductionmentioning

confidence: 87%

Plasmonic enhancement of photoacoustic-induced reflection changes

et al. 2021

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In this paper, we report on surface-plasmon-resonance enhancement of the time-dependent reflection changes caused by laser-induced acoustic waves. We measure an enhancement of the reflection changes induced by several acoustical modes, such as longitudinal, quasi-normal, and surface acoustic waves, by a factor of 10-20. We show that the reflection changes induced by the longitudinal and quasi-normal modes are enhanced in the wings of the surface plasmon polariton resonance. The surface acoustic wave-induced reflection changes are enhanced on the peak of this resonance. We attribute the enhanced reflection changes to the longitudinal wave and the quasi-normal mode to a shift in the surface plasmon polariton resonance via acoustically induced electron density changes and via grating geometry changes.

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“…Noncontact generation of surface phonons on bare solid surfaces can be achieved with pulsed laser irradiation by focusing to a spot with a lens or to a grating pattern through interference between two overlapping beams. − The generation and detection can be conveniently controlled by adjusting the optical polarization. − Extreme ultraviolet radiation provides the opportunity to generate transient gratings with periods smaller than visible optical wavelengths. − …”

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confidence: 99%

Gigahertz Optomechanical Photon–Phonon Transduction between Nanostructure Lines

et al. 2021

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High-frequency surface phonons have a myriad of applications in telecommunications and sensing, but their generation and detection have often been limited to transducers occupying micron-scale regions because of the use of two-dimensional transducer arrays. Here, by means of transient reflection spectroscopy we experimentally demonstrate optically coupled nanolocalized gigahertz surface phonon transduction based on a gold nanowire emitter arranged parallel to linear gold nanorod receiver arrays, that is, quasi-one-dimensional emitter–receivers. We investigate the response up to 10 GHz of these individual optoacoustic and acousto-optic transducers, respectively, by exploiting plasmon-polariton longitudinal resonances of the nanorods. We also demonstrate how the surface phonon detection efficiency is highly dependent on the nanorod orientation with respect to the phonon wave vector, which constrains the symmetry of the detectable modes, and on the nanorod acoustic resonance spectrum. Applications include nanosensing.

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Picosecond ultrasonic study of surface acoustic waves on periodically patterned layered nanostructures

Cited by 7 publications

References 21 publications

Quantitative Ultrafast Magnetoacoustics at Magnetic Metasurfaces

Quantitative Ultrafast Magnetoacoustics at Magnetic Metasurfaces

Plasmonic enhancement of photoacoustic-induced reflection changes

Gigahertz Optomechanical Photon–Phonon Transduction between Nanostructure Lines

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