Phononic crystal slabs: fundamentals and applications

International audienceWe present in this paper theoretical and experimental studies of guided acoustic wave propagating in phononic crystal slabs. By the insertion of scatters or the deposition of pillars on slabs, we are able to built up these artificial crystals. With appropriate choice of the geometrical parameters, we show that these structures can display complete band gaps in silicone membrane based on a Bragg or a local resonance mechanism. Additionally, the introduction of defects inside the perfect crystals allows us to achieve high quality factor acoustic resonators as well as acoustic filters at high frequency regime in the phononic crystal slabs