Shape-Dependent Nonlinear Optical Properties of Anisotropic Gold Nanoparticles

Yi Hua, Kavita Chandra, Duncan Hieu M Dam, Gary P. Wiederrecht, Teri W Odom

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

This Letter reports the shape-dependent third-order nonlinear optical properties of anisotropic gold nanoparticles. We characterized the nonlinear absorption coefficients of nanorods, nanostars, and nanoshells using femtosecond Z-scan measurements. By comparing nanoparticle solutions with a similar linear extinction at the laser excitation wavelength, we separated shape effects from that of the localized surface plasmon wavelength. We found that the nonlinear response depended on particle shape. Using pump-probe spectroscopy, we measured the ultrafast transient response of nanoparticles, which supported the strong saturable absorption observed in nanorods and weak nonlinear response in nanoshells. We found that the magnitude of saturable absorption as well as the ultrafast spectral responses of nanoparticles were affected by the linear absorption of the nanoparticles.

Original languageEnglish
Pages (from-to)4904-4908
Number of pages5
JournalJournal of Physical Chemistry Letters
Volume6
Issue number24
DOIs
Publication statusPublished - Nov 23 2015

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Keywords

  • anisotropic metal nanoparticles
  • gold nanostars
  • hot electrons
  • nonlinear
  • saturable absorption
  • Z-scan

ASJC Scopus subject areas

  • Materials Science(all)

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