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Proceedings Paper

Picosecond dynamics of Cu nanoparticle composites embedded in insulators by 60-keV negative-ion implantation
Author(s): Yoshihiko Takeda; Chi-Gyu Lee; Vassili V. Bandourko; Naoki Kishimoto
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Paper Abstract

Steady-state and laser-induced transient absorption around the surface plasmon resonance of copper nanoparticle composites, fabricated by ion implantation, have been studied by optical measurements. Negative ion implantation has been applied to generate the Cu nanoparticles in amorphous SiO2, crystalline MgOn(Al2O3), LiNbO3, SrTiO3 and TiO2 with various refractive indices and optical energy gaps. The surface plasmon resonance in the steady-state absorption resulted from formation of nanoparticles in the substrates and shifted to red with increasing refractive index of the matrix. The nanoparticle fabrication by the negative ion implantation was succeeded in all the insulating substrates used, and it is capable to tune the resonance band to 1.7 - 2.2 eV (730 - 560 nm) by selecting of the matrix. However, there remained a problem that the plasmon band in LiNbO3, SrTiO3 and TiO2 with narrow energy gap overlapped radiation-induced defect band. Laser-induced transient absorption was measured with a technique of pump-probe femtosecond spectroscopy. The bleaching plasmon band recovered in several picoseconds due to energy transfer from the excited electron system to the phonon system via the electron-phonon interaction. The transient absorption is also affected by radiation damage in the matrices with the narrow energy gap.

Paper Details

Date Published: 28 March 2002
PDF: 8 pages
Proc. SPIE 4628, Nonlinear Materials: Growth, Characterization, Devices, and Applications, (28 March 2002); doi: 10.1117/12.460815
Show Author Affiliations
Yoshihiko Takeda, National Institute for Materials Science (Japan)
Chi-Gyu Lee, National Institute for Materials Science (Japan)
Vassili V. Bandourko, National Institute for Materials Science (Japan)
Naoki Kishimoto, National Institute for Materials Science (Japan)


Published in SPIE Proceedings Vol. 4628:
Nonlinear Materials: Growth, Characterization, Devices, and Applications
Dennis D. Lowenthal; Yehoshua Y. Kalisky, Editor(s)

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