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

Li Wang; Nishijima, Yoshiaki; Ueno, Kosei; Misawa, Hiroaki; Tamai, Naoto
August 2009
Applied Physics Letters;8/3/2009, Vol. 95 Issue 5, p053116
Academic Journal
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.


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