Focusing surface acoustic waves produced by plasmonic mechanical nanoresonators

H. BOGGIANO; L. NAN; B. TILMANN; S. A. MAIER; G. GRINBLAT; E. CORTÉS; A. V. BRAGAS

Conferencia; 13th International Conference on Metamaterials, Photonic Crystals and Plasmonics; 2022

Plasmonic nanoantennas have proven to be efficient optomechanical transducers for generating and detecting hypersound at the nanoscale. Excited with ultrafast laser pulses, these nanostructures sustain highfrequency coherent acoustic vibrations that emit a field of surface acoustic waves onto the underlying substrate. Here we introduce a novel design, consisting of a circular arc array of gold nanodisks, that allows to control the directionality of these waves and even focus them in a very small region of space.