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1.3 PHYSICAL SCIENCES, Condensed matter physics, Optics
We describe the optimisation of the holographic patterning of sub-micrometer surface relief structures in an acrylamide-based photopolymer. A substantial improvement in the photoinduced surface relief resolution was achieved by altering the photopolymer chemical composition and by introducing a single step post recording thermal treatment of the layers. It was observed that, by optimisation of the chemical composition of the photopolymer layers, the maximum achievable spatial frequency increases from 200 l/mm to 550 l/mm. The improvement of the surface relief amplitude by alteration of the chemical composition is limited due to the fact that both decrease of the plasticiser and increase of the monomer concentrations result in less stable photopolymer layers. In order to obtain further improvement in the spatial frequency resolution a thermal treatment of the layers was implemented. It was observed that baking of the layers at temperatures ranging from 120 to 220°C at a rate of 1°C /min makes possible the inscription of surface relief profiles with a sub micrometer period of 650 nm and amplitude of 15 nm.
Trainer, K., Wearen, K., Nazarova, D., Naydenova, I., Toal, V.: Optimisation of an acrylamide-based photopolymer system for holographic inscription of surface patterns with sub-micron resolution. JOURNAL OF OPTICS, 12 124012, doi: 10.1088/2040-8978/12/12/124012. 2010.