Optical Properties And Coherent Vibrational Oscillations Of Gold Nanostars

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. © 2012 Elsevier B.V. All rights reserved.

Publication Date

8-10-2012

Publication Title

Chemical Physics Letters

Volume

543

Number of Pages

127-132

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.cplett.2012.06.058

Socpus ID

84864458620 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84864458620

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