Near-IR vibrational dynamics of periodic gold single and pair nanocuboids

摘要

We examined vibrational dynamics of periodic gold single and pair nanocuboids with 9 nm separation at 400 nm excitation by near-IR transient absorption spectroscopy. The similar oscillation periods of coherent phonon vibration (77 ± 1 ps) were observed for both nanocuboids while the damping of the pair was faster than that of the single. From the analysis of bleaching peak shift and finite-difference time-domain calculation, the lattice change in coherent phonon vibration was estimated to be ±1% for a quasiextensional and ±3% for an quasibreathing modes of a single nanocuboid.