Coherent anti-stokes emission from gold nanorods and its potential for imaging applications

Li Jiang, Iwan W. Schie, Jun Qian, Sailing He, Thomas R Huser

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

We used coherent anti-Stokes scattering (CAS) to characterize individual gold nanorods (GNRs) and GNR aggregates. By creating samples with different densities of GNRs on silicon wafer substrates, we were able to determine surface coverage by scanning electron microscopy (SEM) and then correlate the coverage to the CAS intensities of the samples. The observed CAS signal intensity was quadratically dependent on the number of particles. We also examined the CAS signal as a function of the excitation polarization and found that the strongest signals in regularly oriented GNRs were observed when the beam polarization was aligned with the longitudinal axis of the GNRs. Irregularly oriented GNRs exhibited a different scattering pattern to that observed for regularly oriented GNRs. The polarization-dependent scattering from oriented GNRs showed cos 6 (θ) behavior. By imaging nanoscale-sized GNR patterns using CAS and evaluating the results with SEM, we show that CAS can be used for efficient, label-free imaging of nanoscale metallic particles. Scattered in all directions: Coherent anti-Stokes scattering (CAS) is used to characterize individual gold nanorods (GNRs) and GNR aggregates. The CAS signal is also examined as a function of the excitation polarization. Irregularly oriented GNRs exhibit a different scattering pattern to that observed for regularly oriented GNRs. The polarization-dependent scattering from oriented GNRs shows cos 6 (θ) behavior (see picture).

Original languageEnglish (US)
Pages (from-to)1951-1955
Number of pages5
JournalChemPhysChem
Volume14
Issue number9
DOIs
StatePublished - Jun 24 2013

Keywords

  • CARS (coherent anti-Stokes Raman scattering)
  • gold
  • nanostructures
  • nonlinear optics
  • scanning probe microscopy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Atomic and Molecular Physics, and Optics

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