Some of them are relatively simple and cost-effective, but sizes and shapes of the obtained metallic nanoparticles are not homogeneous. There are a lot of methods for the manufacturing of plasmonic platforms. The use of plasmonic effects opens up many interesting possibilities, as for example photoluminescence intensification or subwavelength propagation. One of the most interesting fields based on metal nanostructures is plasmonics. Of course, this increase was closely related to the development of novel manufacturing technologies. This is mainly due to technological needs related to the development of optoelectronics, photonics, electronics and energy conversion systems, fields in which metallic nanostructures found their application. However, the number of works on this subject has increased significantly over the last ten years. The evolution of metal thin films into nanostructures under various thermal conditions has been repeatedly studied for many years. The calculated absorbance, as a result of the FDTD simulation shows a quite good agreement with experimental data obtained in the UV–vis range.
Simulations of electromagnetic field propagation through the produced samples were performed using the finite-difference time domain (FDTD) method. This sample was subsequently chosen for theoretical calculations. The most homogeneous seems to be the platform obtained by solidification of a 2.8 nm Au film, annealed at 550 ☌ for 15 min. Structural investigations confirmed, that nanostructures consist of metallic Au, growing along the direction. The structure of platforms was investigated using XRD and XPS methods. For the surface morphology studies, SEM and AFM measurements were performed. In order to determine homogeneous shape and space distribution, the influence of annealing conditions and the initial thickness of the Au film on the nanostructures was analyzed. Plasmonic platforms based on Au nanostructures have been successfully synthesized by directional solidification of a eutectic from Au and the substrate.
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