Author/Authors :
Wheeler، نويسنده , , Damon A. and Green، نويسنده , , Thomas D. and Wang، نويسنده , , Haining and Fernلndez-Lَpez، نويسنده , , Cristina and Liz-Marzلn، نويسنده , , Luis and Zou، نويسنده , , Shengli and Knappenberger، نويسنده , , Kenneth L. and Zhang، نويسنده , , Jin Z.، نويسنده ,
Abstract :
Hot electron relaxation and coherent vibrational oscillations of gold nanostars (AuNS) were studied using femtosecond laser spectroscopy. Transient profiles feature a fast decay attributed to electron–phonon interaction and a slower decay due to phonon relaxation. Superimposed on the slow decay are oscillations attributed to coherent vibrations of the AuNS with a period dependent on probe wavelength, due to size variation of the AuNS. In addition, persistent spectral hole-burning studies indicate depletion of AuNS at the excitation wavelength and formation of redder-absorbing AuNS aggregates. In conjunction with experiments, theoretical calculations were carried out to gain insight into the coherent vibrational oscillations.
