Abstract
In order to further understand the mechanism of volume hologram formation in photosensitive polymers, light-induced material response is analyzed in commonly used epoxy-based negative photoresist Epon SU-8. For this purpose, time-resolved investigation of volume holographic grating growth is performed in the SU-8 based host–guest system and in the pure SU-8 material, respectively. The comparison of grating growth curves from doped and undoped system allows us to draw conclusions on the impact of individual components on the grating formation process. The successive formation of transient absorption as well as phase gratings in SU-8 is observed. Influence of exposure duration and UV flood cure on the grating growth are investigated. Observed volume holographic grating formation in SU-8 can be explained based on the generation and subsequent diffusion of photoacid as well as time-delayed polymerization of exposed and unexposed areas.
Highlights
Volume holography represents a very interesting field of application for photo-responsive polymers
This suggests a direct correlation of the first growth step with the exposure duration, which will be investigated more closely
The residual diffraction properties can be explained by the formation of a permanent phase grating
Summary
Volume holography represents a very interesting field of application for photo-responsive polymers. The mechanism of volume hologram formation in photosensitive polymers, a complex process where several components are involved, is attributed to the interplay of polymerization and diffusion, induced by a spatially modulated holographic exposure [1]. A useful tool to draw conclusions on the mechanism of volume hologram formation is to study the light-induced material response. Namely low cost, ease of fabrication and high flexibility They fulfill the requirements for volume holographic recording with no need for solvent processing, good dimensional stability, variable thickness, high energetic sensitivity, large dynamic range, and sharp angular selectivity [11]. A new new organic organic photosensitive photosensitive material for volume holographic recording, based on an epoxy host–guest recently beenbeen introduced [5].
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