Plasmonic, Low-Frequency Raman, and Nonlinear Optical-Limiting Studies in Copper-Silica Nanocomposites

Satyabrata Mohapatra*, Y. K. Mishra, A. M. Warrier, Reji Philip, S. Sahoo, A. K. Arora, D. K. Avasthi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

Nanocomposite thin films consisting of Cu nanoparticles embedded in silica matrix were synthesized by atom beam co-sputtering technique. Plasmonic, optical, and structural properties of the nanocomposite films were investigated by using ultraviolet (UV)-visible absorption spectroscopy, nonlinear optical transmission, X-ray diffraction (XRD), and low-frequency Raman scattering. UV-visible absorption studies revealed the surface plasmon resonance absorption at 564 nm which showed a red shift with increase in Cu fraction. XRD results together with surface plasmon resonance absorption confirmed the presence of Cu nanoparticles of different size. Low-frequency Raman studies of nanocomposite films revealed breathing modes in Cu nanoparticles. Nanocomposites with lower metal fractions were found to behave like optical limiters. The possibility of controllably tuning the optical nonlinearity of these nanocomposites could enable them to be the potential candidates for applications in nanophotonics.

Original languageEnglish
Pages (from-to)25-31
Number of pages7
JournalPlasmonics
Volume7
Issue number1
DOIs
Publication statusPublished - Mar 2012

Keywords

  • Nonlinear absorption
  • Optical limiting
  • Plasmonic nanocomposites
  • Surface plasmon resonance

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