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Exponential growth of data motivates scientists to develop novel optical data storage technologies with the merits of low cost, large capacity, long lifetime, and low power consumption, thus facilitates the development of low-carbon and environmentally friendly economy. Volume holographic data storage, as a promising new generation optical data storage technology, has attracted a tremendous amount of attention within the scientific community, and the lack of appropriate storage medium seriously hinder its large-scale commercial applications. PQ/PMMA photopolymers possess excellent characteristics of low cost, neglectable volume shrinkage and controllable thickness for holographic data storage, while poor holographic performance inhibits its direct applications. Herein, via simply introducing C60 nanoparticles in PQ/PMMA, we successfully synthesize photopolymer with a record-high diffraction efficiency and refractive index modulation, for the first time, reaching up to ~80% and ~1.13×10-4, respectively. More interestingly, C60 nanoparticles here dramatically enhance the intensity holography, but seriously suppress the polarized holographic one. Experimental characterizations and theoretical simulations demonstrate that polarization sensitive holographic performance and reduction of photoinduced anisotropy induced by C60 stem from the strong π-π non-bonding interactions between PQ photosensitizers and C60 molecules (supramolecular) but not chemical reactions. Moreover, C60-PQ/PMMA show a great potential for holographic data storage, exhibiting high chemical stability under extreme working conditions and the angle-multiplexing of 321 gratings and corresponding holographic images are successfully recorded and read on it.
Acknowledgment: This work was financially supported by the National Key R&D Program of China (Grant NO. 2018YFA0701800)
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