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Communication Dans Un Congrès Année : 2010

Hypersonic phononic crystal for surface acoustic waves

Résumé

A phononic crystal exhibiting a band gap in the near-gigahertz frequency range for surface acoustic waves was fabricated in a lithium niobate substrate. Reflection and transmission properties of the sample were characterized both electrically and optically, by means of embedded broadband interdigitated transducers and optical heterodyne interferometry, respectively. Measurements performed for (XZ) propagating surface waves show the existence of a band gap between 660 and 900 MHz. Optical measurements confirm that the phononic crystal behaves as a perfect mirror for waves propagating at frequencies within the band gap. Outside of the band gap, transmission can be observed for frequencies below, but also above the forbidden frequency range, hence showing that losses experienced by high frequency surface acoustic waves, i.e. for modes located beyond the sound line, can be partially overcome.
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Dates et versions

hal-00541927 , version 1 (01-12-2010)

Identifiants

  • HAL Id : hal-00541927 , version 1

Citer

Sarah Benchabane, Gwenn Ulliac, O. Gaiffe, Roland Salut, Younes Achaoui, et al.. Hypersonic phononic crystal for surface acoustic waves. IEEE International Ultrasonics Symposium, Oct 2010, San Diego, CA, United States. paper 3D-4. ⟨hal-00541927⟩
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