Fast time-domain laser Doppler vibrometry characterization of surface acoustic waves devices

Smagin, Nikolay; Djoumi, Lyes; Herth, Étienne; Vanotti, Meddy; Fall, Dame; Blondeau-Pâtissier, Virginie; Duquennoy, Marc; Ouaftouh, Mohammadi

doi:10.1016/j.sna.2017.07.035

Cited by 17 publications

(16 citation statements)

References 40 publications

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“…In Situ Time-Resolved Magnetic Imaging: Time-resolved imaging experiments are performed in a time-resolved wide-field magnetooptical Kerr microscope, which utilizes stroboscopic magnetic imaging with a pulsed laser that has a repetition rate of f rep = 50 MHz, a pulse width of pw = 7 ps, and a wavelength of λ = 532 nm. [39][40][41] The laser pulse width corresponds to a bandwidth of bw ≈ 50 GHz for the imaging system. The spatial resolution limits the detection of SAWs to minimum wavelengths of about 500 nm.…”

Section: Methodsmentioning

confidence: 99%

“…[38,39] Yet, since for Love waves there is no strain normal to the surface standard, out-of-plane displacement sensitive techniques like Laser Doppler Vibrometry are only indirectly applicable. [40] Only photoelastic methods have demonstrated the possibility of imaging propagating shear waves. [41,42] Fundamental magnetodynamic phenomena in SAW based devices have been studied by PEEM and magnetooptics.…”

Section: Introductionmentioning

confidence: 99%

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Imaging of Love Waves and Their Interaction with Magnetic Domain Walls in Magnetoelectric Magnetic Field Sensors

Müller

Durdaut

Holländer

et al. 2022

Adv Elect Materials

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The complex behavior of horizontally polarized surface shear waves in magnetoelectric surface acoustic wave based magnetic field sensor devices is revealed by time‐resolved magnetooptical microscopy with picosecond temporal and submicron spatial resolution. The imaging of the propagating waves in the magnetoelectric composites is realized through the functional soft‐magnetic layer by coupled magnetoelastic interactions. Partial surface wave reflections, wave front dephasing, and secondary wave generation occur, which originate from structures and magnetic domain walls. Closure domain structures bend and reflect the magnetic surface waves. Strain stimulated magnetic domain walls display dynamic periodic expansions, which propagate along the domain walls and change the magnetomechanical response also in the surrounding regions. The revealed spatial and temporally varying nondeterministic response restricts the noise performance of the surface acoustic wave based magnetic field sensors and thus confines the sensor's limit of detection. Magnetic time‐resolved optical imaging is shown to be a powerful method for the operando characterization of magnetoelectric devices and in‐plane displacement surface acoustic wave fields that are not accessible by other methods.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Imaging of Love Waves and Their Interaction with Magnetic Domain Walls in Magnetoelectric Magnetic Field Sensors

Müller

Durdaut

Holländer

et al. 2022

Adv Elect Materials

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“…The measurements were carried out at the IEMN’s WAVESURF platform ( Figure 6 ). The device is primarily composed of an interferometer that enables the detection of out-of-plane SAW displacements on the surface of the controlled samples [ 28 ].…”

Section: Application To the Characterization Of Thin Filmsmentioning

confidence: 99%

Development of a Broadband (100–240 MHz) Surface Acoustic Wave Emitter Devoted to the Non-Destructive Characterization of Sub-Micrometric Thin Films

Duquennoy

Smagin

Kadi

et al. 2022

Sensors

Self Cite

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In the ultrasonic non-destructive evaluation of thin films, it is essential to have ultrasonic transducers that are able to generate surface acoustic waves (SAW) of suitably high frequencies in a wide frequency range of between ten and several hundred megahertz. If the characterization is carried out with the transducer in contact with the sample, it is also necessary that the transducers provide a high level of mechanical displacement (>100 s pm). This level allows the wave to cross the transducer–sample interface and propagate over the distance of a few millimeters on the sample and be properly detected. In this paper, an emitter transducer formed of interdigitated chirp electrodes deposited on 128° Y-cut LiNbO3 is proposed. It is shown that this solution efficiently enables the generation of SAW (displacement level up to 1 nm) in a frequency range of between 100 and 240 MHz. The electrical characterization and a displacement field analysis of SAW by laser Doppler vibrometry are presented. The transducer’s significant unidirectionality is demonstrated. Finally, the characterization of two titanium thin films deposited on silicon is presented as an example. A meaningful SAW velocity dispersion (~10 m/s) is obtained, which allows for the precise estimation (5% of relative error) of the submicrometer thickness of the layers (20 and 50 nm).

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“…One of the effects that ultrasound can induce is mechanical displacement, which results in the periodic movement of all the molecules in targeted neurons. The amplitude of the mechanical displacement ranges from picometers to microns depending on the actuation frequency and signal power ( Smagin et al, 2017 ; Feeney et al, 2019 ), where these displacements drive ion channel activation by changing the conformational state of channel proteins and their surrounding bilayer ( Perozo et al, 2002 ; Gullingsrud and Schulten, 2004 ; Jensen and Mouritsen, 2004 ; Lee, 2004 ; Phillips et al, 2009 ; Buyan et al, 2019 ; Callahan et al, 2019 ). Existing research using traditional ultrasound has indicated that there are several ion channels that respond to mechanical displacement ( Blackmore et al, 2019 ).…”

Section: Mechanisms Of Acoustic Neuromodulationmentioning

confidence: 99%

Mechanisms and Applications of Neuromodulation Using Surface Acoustic Waves—A Mini-Review

et al. 2021

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The study of neurons is fundamental for basic neuroscience research and treatment of neurological disorders. In recent years ultrasound has been increasingly recognized as a viable method to stimulate neurons. However, traditional ultrasound transducers are limited in the scope of their application by self-heating effects, limited frequency range and cavitation effects during neuromodulation. In contrast, surface acoustic wave (SAW) devices, which are producing wavemodes with increasing application in biomedical devices, generate less self-heating, are smaller and create less cavitation. SAW devices thus have the potential to address some of the drawbacks of traditional ultrasound transducers and could be implemented as miniaturized wearable or implantable devices. In this mini review, we discuss the potential mechanisms of SAW-based neuromodulation, including mechanical displacement, electromagnetic fields, thermal effects, and acoustic streaming. We also review the application of SAW actuation for neuronal stimulation, including growth and neuromodulation. Finally, we propose future directions for SAW-based neuromodulation.

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Fast time-domain laser Doppler vibrometry characterization of surface acoustic waves devices

Cited by 17 publications

References 40 publications

Imaging of Love Waves and Their Interaction with Magnetic Domain Walls in Magnetoelectric Magnetic Field Sensors

Imaging of Love Waves and Their Interaction with Magnetic Domain Walls in Magnetoelectric Magnetic Field Sensors

Development of a Broadband (100–240 MHz) Surface Acoustic Wave Emitter Devoted to the Non-Destructive Characterization of Sub-Micrometric Thin Films

Mechanisms and Applications of Neuromodulation Using Surface Acoustic Waves—A Mini-Review

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