Third order optical nonlinearity of colloidal metal nanoclusters formed by MeV ion implantation

S. S. Sarkisov, E. Williams, M. Curley, D. Ila, P. Venkateswarlu, D. B. Poker, D. K. Hensley

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Abstract

We report the results of characterization of nonlinear refractive index of the composite material produced by MeV Ag ion implantation of LiNbO3 crystal (z-cut). The material after implantation exhibited a linear optical obsroption spectrum with the surface plasmon peak near 430 nm attributed to the colloidal silver nanoclusters. Heat treatment of the material at 500°C caused a shift of the absorption peak to 550 nm. The nonlinear refractive index of the sample after heat treatment was measured in the region of the absorption peak with the Z-scan technique using a tunable picosecond laser source (4.5 ps pulse width). The experimental data were compared against the reference sample made of MeV Cu implanted silica with the absorption peak in the same region. The nonlinear index of the Ag implanted LiNbO3 sample produced at five times less fluence is on average two times greater than that of the reference.

Original languageEnglish
Pages (from-to)294-298
Number of pages5
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume141
Issue number1-4
DOIs
StatePublished - May 1998

Funding

This research was supported by the Department of Natural and Physical Sciences, the Center for Irradiation of Materials, Alabama A&M University, Alliance for Nonlinear Optics (NASA Grant NAGW-4078), and the Division of Material Sciences, U.S. Department of Energy (Contract DE-AC05-96OR22464 with Lockheed Martin Energy Research Corp.).

Keywords

  • Ion implantation
  • Metal nanocluster colloids
  • Nonlinear refractive index
  • Z-scan

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