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Communication Dans Un Congrès Année : 2009

Phononic crystals in micro and nano-acoustics

Résumé

The objective of this presentation is to discuss potential applications of phononic crystals to the field of micro and nano-acoustics. Phononic crystals are two or three-dimensional periodically structured materials that show a number of amazing properties if properly designed. For instance, complete band gaps can be obtained, that is frequency ranges within which no wave propagation is allowed, whatever the incidence and the polarization. Even outside band gaps, the periodic structure leads to very strong spatial and temporal dispersion, resulting in properties unavailable with usual homogeneous materials. Confinement by defects (created by altering locally the otherwise perfectly periodic arrangement) has been shown to lead to efficient energy storage in cavities, to wave guiding in very narrow spaces, and more generally to simple phononic circuits. Some demonstrations of phononic crystals for surface acoustic waves have been published recently, though technologies for the micro and nano-structuration of piezoelectric materials still need to be improved (for instance to obtain deep holes of sub micron aperture at the surface). The spatial dispersion properties of finite phononic crystals have been employed to design acoustic lenses, through the use of positive or negative refraction. Recent achievements in the field will be highlighted, with a particular focus on acoustic waves in fluids. Topics include the confinement of waves in sub-wavelength channels, the potential design of phononic transducers and sensors, and the conversion of surface to bulk acoustic waves and vice versa.
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Dates et versions

hal-00429485 , version 1 (03-11-2009)

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  • HAL Id : hal-00429485 , version 1

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Vincent Laude. Phononic crystals in micro and nano-acoustics. MicroNanoacoustics Workshop, Sep 2009, Prato, Italy. ⟨hal-00429485⟩
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