Observation of band gaps in the gigahertz range and deaf bands in a hypersonic aluminum nitride phononic crystal slab
- Gorisse, M.
- Benchabane, S.
- Teissier, G.
- Billard, C.
- Reinhardt, A.
- Laude, V.
- Defaÿ, E.
- Aïd, M.
DOIAbstract
International audienceWe report on the observation of elastic waves propagating in a two-dimensional phononic crystal composed of air holes drilled in an aluminum nitride membrane. The theoretical band structure indicates the existence of an acoustic band gap centered around 800 MHz with a relative bandwidth of 6.5% that is confirmed by gigahertz optical images of the surface displacement. Further electrical measurements and computation of the transmission reveal a much wider attenuation band that is explained by the deaf character of certain bands resulting from the orthogonality of their polarization with that of the source
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