Acoustic Far-Field Hypersonic Surface Wave Detection with Single Plasmonic Nanoantennas
- Berte, Rodrigo
- Della Picca, Fabricio Leandro
- Poblet, Martín
- Li, Yi
- Cortés, Emiliano
- Craster, Richard V.
- Maier, Stefan A.
- Bragas, Andrea Veronica
DOIAbstract
The optical properties of small metallic particles allow us to bridge the gap between the myriad of subdiffraction local phenomena and macroscopic optical elements. The optomechanical coupling between mechanical vibrations of Au nanoparticles and their optical response due to collective electronic oscillations leads to the emission and the detection of surface acoustic waves (SAWs) by single metallic nanoantennas. We take two Au nanoparticles, one acting as a source and the other as a receptor of SAWs and, even though these antennas are separated by distances orders of magnitude larger than the characteristic subnanometric displacements of vibrations, we probe the frequency content, wave speed, and amplitude decay of SAWs originating from t...
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