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Proceedings Paper

Nonlinear response of metal nanoparticle embedded in insulators by 60-keV negative ion implantation
Author(s): Yoshihiko Takeda; Jing Lu; Naoki Kishimoto
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Paper Abstract

Linear and nonlinear optical properties of Ta nanoparticle composites, fabricated by negative ion implantation, were studied in the visible range. Negative Ta ions of 60 keV were implanted into amorphous SiO2 and crystalline TiO2 with a total dose of 3× 1016 ions/cm2. Optical absorption evidently indicated a surface plasmon peak around 2 eV and the peak resulted from formation of nanoparticles embedded in the matrix. The plasmon peak shifted with dependening on the refractive index of the substrates. The laser-induced transient absorption was measured with the technique of pump-probe femtosecond spectroscopy. The transient absorption of the Ta nanoparticle composite in SiO2 recovered in several picoseconds due to energy transfer from the excited electrons to the lattice via the electron-phonon interaction. The transient response was comparable to that of the noble metals. The electron-phonon coupling was evaluated by the two-temperature model and the coupling constant yielded a value of g = 3.1 × 1018 W/m3K. The Ta nanoparticle composite has the advantage of thermal stability in comparison with Cu nanoparticle composites.

Paper Details

Date Published: 13 November 2002
PDF: 6 pages
Proc. SPIE 4934, Smart Materials II, (13 November 2002); doi: 10.1117/12.469048
Show Author Affiliations
Yoshihiko Takeda, National Institute for Materials Science (Japan)
Jing Lu, National Institute for Materials Science (Japan)
Naoki Kishimoto, National Institute for Materials Science (Japan)

Published in SPIE Proceedings Vol. 4934:
Smart Materials II
Alan R. Wilson, Editor(s)

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