In this paper, selective deposition of conductive copper films on glass surfaces is demonstrated with the assistance of
femtosecond laser surface modification followed by electroless plating. Irradiation of femtosecond laser makes it
possible to selectively deposit copper films in the irradiated area on glass surfaces coated with silver nitrate films. The
influence of the laser direct writing parameters and the electroless plating process on the formation of copper films is
discussed. Meanwhile, the electric properties of copper films are investigated, which confirms that copper films are
conductive. A tentative mechanism of the selective deposition process is also proposed. In addition, the potential
application of this technique for integrating electrical and thermal functions into microdevices is discussed.
Three-dimensionally manipulated gold nanoparticles were precipitated in silicate glass containing gold ions by irradiation with femtosecond pulsed laser and successive heat treatment. Influence of the heat treatment conditions on the gold nanoparticles precipitation behaviors was investigated. For the tested silicate glass, the treatment temperature threshold of irradiated area for color appearance was obviously lower than that of non-irradiated area. Along with increasing the treatment temperature from such threshold, the irradiated area turned to be colorful. And finally the whole glass became multicolored corresponding to a certain high temperature. Absorption spectrum measurement indicated that, under the given irradiation condition, the sizes of Au nanoparticles were obviously affected by the heat treatment temperature.
We report on the observation of space-selective precipitation of silver nanoparticles in the Ag2O doped silicate glass in a method of irradiation with an 800nm femtosecond laser and then heat-treatment. The irradiated portion of the glass first became gray in color after irradiation of the femtosecond laser and then turned into yellow after further heat-treatment at around 400 °C. An absorption peak at 402 nm observed in the absorption spectra of the irradiated and heat-treated glass indicates that silver nanoparticles have precipitated in the irradiated region of the glass. A possible mechanism has been suggested that the Ag+ ions in the region irradiated are first reduced to Ag atoms by femtosecond laser through multiphoton absorption and then accumulate to form silver nanoparticles when glass sample was heat-treated. The observed phenomenon should have potential applications in fabrication of ultrafast all-optical switch.
The Optical nonlinearities and optical limiting (OL) properties of Sol-gel solidified gold nanorods were investigated by using Z-scan technique and OL measurement, respectively, with nanosecond pulses at 532nm. The experimental results show that their strong nonlinear optical performances depend on the sizes of nanorods. The surface plasmon absorption is the main mechanism.
Nonlinear optical properties of femtosecond laser-induced micro-structures containing gold nanoparticles in silicate glasses were investigated by using Z-scan technique with 8ns pulses at 532nm. Optical limiting effects of such structures were also measured. The experimental results were found to be significantly variable for the microstructures under different induction conditions. Strong optical nonlinearities in these yielded structures can be attributed to the surface plasmon absorption of gold nanoparticles precipitated in glasses. These microstructures exhibiting large optical nonlinearities are inferred to be useful for the fabrication of integrated ultrafast optical switching and laser protection devices.
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