Micro and nano-phononics

Phononic crystals (PnC) are periodic structures that have an ability to forbid the propagation of elastic waves in certain frequency. This region is known as Phononic Band Gap (PnBg) and can be used as guiding or filtering for elastic or acoustic wave. This ability has attracted many researchers around the world and many applications can be found from it such as in sensor, multiplexer, acoustic lens and acoustic cloaking. Furthermore, defects in the periodicity can be used to confine acoustic waves to follow complicated routes on a wavelength scale. In this presentation, we will show that mechanical micro- or nano resonators can made their way towards phononics where they lie at the heart of acoustic or elastic metamaterials. Particularly, phononic crystals based on resonant inclusions, could be used to strongly confine elastic waves and more specifically elastic waves propagating at the surface of a semi-infinite substrate exploiting the rich physics offered by the different coupling mechanisms in view of designing resonator systems capable to confine, control and transport the elastic energy at the micro and nano scale.