Optimization of photosensitive polymers doped with C60 nanoparticles for high-density polarization holographic storage

Holographic media with high diffraction efficiency are crucial for advancing high-density polarization holographic storage technologies. In this study, we enhanced the holographic performance of the material by exploiting the interaction between C₆₀ and the photoinitiator, and adjusting the cross-linking density between low-refractive-index monomer and high-refractive-index epoxy resin. The results show that increasing the number of functional groups of the monomer can accelerate the polymerization reaction. Furthermore, when synergistically combined with C₆₀ nanoparticles, this increases the diffraction efficiency of the photopolymer to 81.5% and optimizes its polarization holographic response (9.4 %), achieving high photosensitivity and low volume shrinkage (0.0795 %). In large-angle polarization holography, the orthogonal polarization diffraction efficiency of the photopolymer exhibits a strong correlation with C₆₀ nanoparticle doping concentration. The π-π non-covalent interaction between C₆₀ nanoparticles attracts photosensitizers, accelerating the decomposition of the photosensitizer and enhancing the monomer's double-bond conversion. The synthesized photopolymer can achieve high-density storage with a low bit error rate (0.8 %). Aging experiments indicate that this material can remain stable for a long time. This study provides a feasible approach for the development of high-performance nanocomposite photopolymers and materials sensitive to polarization holography.