Tunable Fabrication and Optical Properties of Metal Nano Hole Arrays

Large area polystyrene sphere (PS) arrays with different diameters were prepared by an interface self-assembly method. The inter-particle spacing of PSs was reduced by O2-plasma treatment. When O2-plasma treatment time was long enough, the space of PS arrays could be relatively large. After deposition of Au film and removing the PS masks, we obtained the Au holes arrays instead of Au triangle arrays as normal. The period and the diameter of the hole arrays can be adjusted by the PS with different size and by the O2-plasma treatment time. Then their optical property can be tuned effectively due to the surface plasmon resonance on these structures.