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Communication Dans Un Congrès Année : 2012

Generation and detection of sinusoidal ultrasonic waves in the GHz-THz frequency range

Denis Mounier
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Tomasz Nowak
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Gwenäelle G. Vaudel
Pascal Ruello
Vitali Goussev

Résumé

Through a sinusoidal thermo-modulation of a thin metallic film deposited on a substrate, monochromatic acoustic waves can be generated in the substrate (Damen, PRL 1995). Two interfering tunable lasers are used to induce a thermo-modulation at a frequency equal to the lasers beating frequency. Thus, the generated ultrasonic waves can be continuously tuned from 0 Hz up to the THz range by tuning the optical frequency of each pump laser. For the detection of the sinusoidal acoustic waves, an additional CW laser is used as a probe, which interacts with the laser-generated acoustic beam. The detection of the weak perturbation of the probe beam intensity induced by the acoustic beam requires a particular modulation of the pump lasers. We describe the experiments, which demonstrate that the detection of sinusoidal acoustic waves at frequencies in the GHz-THz range is possible. With a precise control of the optical frequency of both pump lasers, it becomes feasible to generate monochromatic acoustic waves with a very narrow line-width, typically less than one MHz. Ultrasound spectroscopy with high resolution is achievable using such monochromatic acoustic waves. This technique would be beneficial for the study of nano-resonators with very high-quality factors, such as nano-membranes and nano-rods.
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Dates et versions

hal-00811304 , version 1 (23-04-2012)

Identifiants

  • HAL Id : hal-00811304 , version 1

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Denis Mounier, Tomasz Nowak, Jean-Marc Breteau, Gwenäelle G. Vaudel, Thomas Pezeril, et al.. Generation and detection of sinusoidal ultrasonic waves in the GHz-THz frequency range. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00811304⟩
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