Acoustic surface wave devices Acoustic waves 4 Nanoantennas 4 Numerical methods 4 Optical response 4 Plasmonics 4 Probes 4 Surface acoustic waves 4 Vibrations (mechanical) 4 Circuit oscillations 2 Coherent phonons 2 Decay characteristics 2 Frequency contents 2 Fused silica 2 Gold nanoparticles 2 Mechanical excitations 2 Metamaterial antennas 2 Nanoparticles 2 Optical properties 2 Orders of magnitude 2 Photonics 2 Plasmons 2 Pump-probe experiments 2 Pump-probe technique 2 Signal detection 2 Small metallic particles 2 Spectral content 2 Sub-diffraction 2 Surface waves 2 Vibrational modes 2