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Volume Hologram Formation in SU-8 Photoresist
1Department of Chemistry, Technische Universität Berlin, Strasse des 17. Juni 135, Berlin 10623, Germany. tina@physik.tu-berlin.de.
Polymers
|April 12, 2019
Summary
This study analyzes volume hologram formation in Epon SU-8 photoresist. We found that photoacid diffusion and delayed polymerization drive grating growth, impacting holographic performance.
Area of Science:
- Polymer Science
- Holography
- Photochemistry
Background:
- Epoxy-based negative photoresists like Epon SU-8 are crucial for holographic applications.
- Understanding the precise mechanisms of volume hologram formation is essential for optimizing material performance.
- The host-guest system and pure SU-8 material provide a basis for analyzing component impacts.
Purpose of the Study:
- To elucidate the mechanism of volume hologram formation in Epon SU-8.
- To analyze the light-induced material response in SU-8.
- To investigate the influence of individual components on grating formation.
Main Methods:
- Time-resolved investigation of volume holographic grating growth.
- Comparative analysis of grating growth in SU-8 based host-guest systems and pure SU-8.
- Examination of transient absorption and phase grating formation.
- Study of exposure duration and UV flood cure effects.
Main Results:
- Successive formation of transient absorption and phase gratings was observed in SU-8.
- Grating growth curves differed between doped and undoped systems, indicating component influence.
- Exposure duration and UV flood cure significantly affected grating growth dynamics.
Conclusions:
- Volume holographic grating formation in SU-8 is driven by photoacid generation and diffusion.
- Time-delayed polymerization in both exposed and unexposed areas contributes to grating stability.
- The findings provide insights into optimizing SU-8 for holographic data storage and applications.
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