Laser-assisted implantation of gold nanoparticles, formed under surface plasmon-polariton resonant conditions in polymer layer

- Implantation of Au NPs to the polimer film occurs due to laser-induced transfer.
- NPs are created by irregular heating of Au film in the plasmon-polariton field.
- Total mass of NPs implanted in resonance at 1.75 times greater than outside it.
- Detachment of NPs from substrate occurs mainly due to micro explosive mechanism.
- Fragmentation, NPs detachment and implantation occur in the same laser pulse.

Morphological and optical properties of a polymer film/glass system with laser-implanted Au nanofragments were studied. The polymer films (formvar) were deposited on glass plates by the Langmuir-Blodgett method. The fragmentation of continuous Au films was carried out by a Q-switched YAG:Nd3+ laser (λ = 532 μm, tp = 10 ns) at the condition of the surface plasmon-polariton resonance (SPR) and subsequent ballistic transport of Au nanoparticles (NPs) through the air gap and fixation in the polymer film. It is shown that the average size and concentration of the implanted NPs are significantly influenced by the SPR. They were ranged from 40 nm and 6.5 × 109 cm−2 up to 350 nm and 5 × 107 cm−2 at the resonant and nonresonant cases, respectively. Possible mechanisms of decomposition of the Au film fragments are discussed within the framework of a thermal model.

134