Optical properties and coherent vibrational oscillations of gold nanostars

Damon A. Wheeler, Thomas D. Green, Haining Wang, Cristina Fernández-López, Luis Liz-Marzán, Shengli Zou, Kenneth L. Knappenberger, Jin Z. Zhang

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)127-132
Number of pages6
JournalChemical Physics Letters
Volume543
DOIs
StatePublished - Aug 10 2012

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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