| Title |
Kompleksinių plonų sluoksnių formavimas interferencinių dangų taikymams / |
| Translation of Title |
Application of thin combined films for interference coatings. |
| Authors |
Valavičius, Audrius |
| Full Text |
|
| Pages |
44 |
| Keywords [eng] |
MIF’s ; evaporation ; optical coatings ; silver |
| Abstract [eng] |
More and more optical elements are used in lasers and optical systems. One of the main element in these system are component with optical coatings. In general formation of optics coatings are done using high and low refractive index metal oxides. These materials are stacked together in multilayer film and in some cases formation of such structure are very complex and require high precision. One of the problems in optic is the formation of broadband neutral beam splitter. This optical coating consists of more than twenty layers, which thickness errors are very sensitive to film optical parameters. Metal island films (MIFs) consist of the metal clusters deposited on a substrate surface. Such coatings show unique optical properties due to the surface plasmon resonance of the clusters. These properties might be used for formation of broadband neutral beam splitter by decreasing the number of layer. Using MIF the number of layers decreases more than 3 times, but MIF optical characteristics depend on film growth parameters. Main goal of this work is to investigate the application of metal island film in broadband beam splitters. Metal island films of Ag on glass substrates were fabricated by the e-beam evaporation technique. Consideration was given to dependence of silver island films evaporation parameters and characterization methods. A narrow formation of absorption band peak was noticed when substrate temperature was increased from 100 oC to 300 oC and the vacuum level decreased from 1,5*10-4 mbar to 3*10-6 mbar. These findings were explained by the differences in statistical distribution of shapes and sizes of the obtained silver islands. Percolation effect was observed when silver film reaches the thickness of more than 5 nm. The formation of broad band beam splitter show good agreement for theoretical calculation which can lead it to an application of MIF in such coatings. |
| Dissertation Institution |
Kauno technologijos universitetas. |
| Type |
Master thesis |
| Language |
Lithuanian |
| Publication date |
2016 |
