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Velocimetry of GHz elastic surface waves in quartz and fused silica based on full-field imaging of pump-probe reflectometry.
Photoacoustics
August 2024
Munich University of Applied Sciences HM, Lothstr. 34, Munich, 80335, Bavaria, Germany.
This study reports an imaging method for gigahertz surface acoustic waves in transparent layers using infrared subpicosecond laser pulses in the ablation regime and an optical pump-probe technique. The reflectivity modulations due to the photoelastic effect of generated multimodal surface acoustic waves were imaged by an sCMOS camera illuminated by the time-delayed, frequency-doubled probe pulses. Moving the delay time between , image stacks of wave field propagation were created.
View Article and Find Full Text PDFEnhanced Photon-Phonon Interaction in WSe Acoustic Nanocavities.
ACS Photonics
March 2024
School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom.
Acoustic nanocavities (ANCs) with resonance frequencies much above 1 GHz are prospective to be exploited in sensors and quantum operating devices. Nowadays, acoustic nanocavities fabricated from van der Waals (vdW) nanolayers allow them to exhibit resonance frequencies of the breathing acoustic mode up to ∼ 1 THz and quality factors up to ∼ 10. For such high acoustic frequencies, electrical methods fail, and optical techniques are used for the generation and detection of coherent phonons.
View Article and Find Full Text PDFSpectral analysis of amplitude and phase echoes in picosecond ultrasonics for strain pulse shape determination.
Photoacoustics
December 2023
Graduate School of Engineering, Osaka University, Yamadaoka 2-1, Suita, Osaka, 565-0871, Japan.
We introduce a spectral analysis method in picosecond ultrasonics to derive strain pulse shapes in a opaque sample with known optical properties. The method makes use of both the amplitude and phase of optical transient relative reflectance changes obtained, for example, by interferometry. We demonstrate this method through numerical simulation and by analysis of experimental results for a chromium film.
View Article and Find Full Text PDFFourier Transform Infrared Reflection Anisotropy Spectroscopy of Semiconductor Crystals and Structures: Development and Application in the Mid-Infrared.
Appl Spectrosc
May 2023
Department of Micro- and nanoelectronics, Saint-Petersburg Electrotechnical University "LETI", Saint Petersburg, Russia.
A new method of reflection anisotropy spectroscopy (RAS) with increased mid-IR efficiency owing to the use of a Fourier transform infrared (FT-IR) spectrometer has been developed. An optical setup was implemented using a photoelastic modulator (PEM) to modulate the direction of linear polarization of the probe beam originating from the Michelson interferometer. An original measurement algorithm was proposed to eliminate the influence of spectral inhomogeneity of the PEM efficiency on the obtained spectra using appropriate calibration.
View Article and Find Full Text PDFForward Brillouin scattering interactions support the sensing and analysis of media outside the cladding boundaries of standard fibers, where light cannot reach. Quantitative point-sensing based on this principle has yet to be reported. In this work, we report a forward Brillouin scattering point-sensor in a commercially available, off-the-shelf multi-core fiber.
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