TY - JOUR
T1 - Optical properties and coherent vibrational oscillations of gold nanostars
AU - Wheeler, Damon A.
AU - Green, Thomas D.
AU - Wang, Haining
AU - Fernández-López, Cristina
AU - Liz-Marzán, Luis
AU - Zou, Shengli
AU - Knappenberger, Kenneth L.
AU - Zhang, Jin Z.
N1 - Funding Information:
This work was supported by the National Science Foundation. S.Z. acknowledges the support by the ACS Petroleum Research no. 48268-G6 , NSF CBET 0827725 , and ONR N00014-0-1-118 Fund. Some of this material is based upon work supported by the U.S. Air Force Office of Scientific Research under AFOSR award No. FA9550-10-1-0300. Kind thanks go to Mr. Robert Hoelle for help with the SEM and TEM measurements.
PY - 2012/8/10
Y1 - 2012/8/10
N2 - 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.
AB - 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.
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U2 - 10.1016/j.cplett.2012.06.058
DO - 10.1016/j.cplett.2012.06.058
M3 - Article
AN - SCOPUS:84864458620
SN - 0009-2614
VL - 543
SP - 127
EP - 132
JO - Chemical Physics Letters
JF - Chemical Physics Letters
ER -