Characterization of emission from aggregated gold nanoparticles excited nonlinearly by 1560-nm femtosecond laser

Akira Eguchi, Phat Lu, Youngsik Kim, Thomas D Milster

Research output: Contribution to journalArticle

Abstract

Nonlinear emission properties of aggregated 50-nm gold nanoparticles (GNPs) excited by a femtosecond laser at 1560 nm are characterized. Aggregate forms are correlated to emission by scanning electron microscope imaging and pattern matching. Broad spectra in the visible region are obtained from aggregated GNPs, and their emission power exhibits a quadratic power dependence and an exponential decay in time due to morphology change. Polarization analysis reveals that longitudinal plasmonic modes play important roles for nonlinear emission. Relationships between brightness and morphology show that a large number of aggregates produce luminescence enhancement but with associated photo damage. It is proposed that characteristics of nonlinear emission from GNPs are explained by plasmon enhanced polarized hot electrons.

Original languageEnglish (US)
Article number046007
JournalJournal of Nanophotonics
Volume11
Issue number4
DOIs
StatePublished - Oct 1 2017

Keywords

  • gold nanoparticle
  • hot electron
  • nanoparticle aggregation
  • Nonlinear emission
  • short-wave infrared

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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