Abstract
The patterning of an acrylamide-based photopolymer surface by holographic recording is studied. The patterns are induced by light alone and no post-processing is required. Periodic surface modulation is observed in addition to a volume phase grating. An investigation has been carried out using white light interferometry into the dependence of the amplitude of the photo induced surface relief modulation on the spatial frequency, intensity of recording and sample thickness. The observed dependencies indicate that the diffusion of material during the holographic recording plays a major role in surface relief formation. The possibility for inscription of surface relief patterns opens the door to at least two new applications for this photopolymer: fabrication of diffractive optical elements and biosensors.
Highlights
Photoinduced single step inscription of a surface relief modulation in photopolymer systems opens attractive perspectives for applications such as diffractive optical elements [1,2], recording of computer generated holograms [3], and biosensors
Photopolymer systems have been a subject of constantly increasing interest, especially after the development of self-processing photopolymer systems, only a few investigations dedicated to the surface relief formation have been reported in the literature [1,2,4,5]
For the first time to our knowledge, we report an investigation of the photoinduced surface relief modulation in an acrylamide-based photopolymer system [6,7], developed at the Centre for Industrial and Engineering Optics, Dublin Institute of Technology
Summary
Photoinduced single step inscription of a surface relief modulation in photopolymer systems opens attractive perspectives for applications such as diffractive optical elements [1,2], recording of computer generated holograms [3], and biosensors. For the first time to our knowledge, we report an investigation of the photoinduced surface relief modulation in an acrylamide-based photopolymer system [6,7], developed at the Centre for Industrial and Engineering Optics, Dublin Institute of Technology. A maximum surface relief modulation in the order of 3 μm at spatial frequency of 4 l/mm was achieved using recording times of 30 s and intensity of 2.5mW/cm. The dependencies of the photoinduced relief modulation on the spatial frequency, recording intensity and sample thickness are presented. These characteristics are compared with the reported data for other photopolymer systems
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