Coherent control of mechanical states in surface-coupled phononic resonators
Résumé
We propose in this work to illustrate how the interaction between mechanical resonators and traveling surface acoustic waves (SAW) can be used to achieve manipulation of mechanical vibrations at the micron-scale. We investigate the experimental behavior of different isolated or coupled resonator systems to reveal the coupling mechanisms involved. By retrieving the frequency dependence and the vectorial structure of the resonator mechanical motion and of the elastic field distribution at the substrate surface, both inter- and intra-resonator mode coupling is shown to occur, leading to a variety of vibration and energy confinement schemes. The obtained results illustrate the potential of the proposed platform for the coherent control of localized mechanical vibration at a resonator level, and reciprocally for the control of SAW propagation using sub-wavelength features.