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13 March 2007 Modification of noble metal nanoparticles in a silica matrix by pulsed tunable infrared laser irradiation
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Abstract
We have used pulsed tunable infrared laser irradiation to modify the optical and physical properties of metal nanoparticles in a SiO2 substrate. The nanoparticles were fabricated by implanting high-energy Au+ or low-energy Ag+ ions at a dose of 6.1016 ions/cm2. The substrate temperature was held at 400 oC during implantation. The depth of the nanoparticles was well within the 1/e absorption length of the SiO2 substrate at our primary laser wavelength of 8 &mgr;m. The infrared laser beam generated by a picosecond free electron laser (FEL) was scanned across the implanted surface at various fluences. The optical absorption spectra of the gold implanted sample show that the absorption maximum at 520 nm, which is related to the presence of gold colloids, increases with laser fluence. On the other hand, the absorption maximum at 415 nm in the spectra of the silver- implanted sample decreases with increasing laser fluence and shifts to slightly lower wavelengths. In both cases a visible change in the color of the sample is observed, a clear indication of changes in the size distribution of the nanoparticles. Previous experiments used nanosecond excimer lasers that directly interact with the nanoparticles to modify their size and size distribution in different matrices. Our successful modifcation of the nanoparticles by excitation of the matrix vibrational modes, rather then melting of the nanoparticles, shows another possible approach to the processing of nanocomposite optical materials.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
A. Halabica, R. H. Magruder III, and R. F. Haglund Jr. "Modification of noble metal nanoparticles in a silica matrix by pulsed tunable infrared laser irradiation", Proc. SPIE 6458, Photon Processing in Microelectronics and Photonics VI, 64581O (13 March 2007); https://doi.org/10.1117/12.700896
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