Optical properties and coherent vibrational oscillations of gold nanostars

    Authors

    D. A. Wheeler; T. D. Green; H. N. Wang; C. Fernandez-Lopez; L. Liz-Marzan; S. L. Zou; K. L. Knappenberger;J. Z. Zhang

    Comments

    Authors: contact us about adding a copy of your work at STARS@ucf.edu

    Abbreviated Journal Title

    Chem. Phys. Lett.

    Keywords

    SURFACE-PLASMON RESONANCE; METAL NANOPARTICLES; SILVER NANOPARTICLES; RELAXATION DYNAMICS; ELECTRONIC RELAXATION; ACOUSTIC VIBRATIONS; LASER; IRRADIATION; PARTICLES; ULTRAFAST; SPECTROSCOPY; Chemistry, Physical; Physics, Atomic, Molecular & Chemical

    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. (C) 2012 Elsevier B.V. All rights reserved.

    Journal Title

    Chemical Physics Letters

    Volume

    543

    Publication Date

    1-1-2012

    Document Type

    Article

    Language

    English

    First Page

    127

    Last Page

    132

    WOS Identifier

    WOS:000306972300024

    ISSN

    0009-2614

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