Highly Sensitive Photopolymer for Holographic Data Storage Containing Methacryl Polyhedral Oligomeric Silsesquioxane

Abstract

Herein, via introducing eight methacryl polyhedral oligomeric silsesquioxane (Ma-POSS), we dramatically enhance the holographic performance of phenanthraquinone-doped poly­(methyl methacrylate) (PQ/PMMA) photopolymer with excellent characteristics of high sensitivity, high diffraction efficiency, and neglectable volume shrinkage for holographic data storage, the photosensitivity, diffraction efficiency, and volume shrinkage reaching 1.47 cm/J, ∼75%, and ∼0.09%, respectively. Ma-POSS here dramatically enhances the photosensitivity ∼5.5 times, diffraction efficiency more than 50%, and suppressed the volume shrinkage over 4 times. Further analysis reveals that Ma-POSS obviously increased the molecular weight by grafting PMMA to be a star-shaped macromolecule. And the residual CC of POSS–PMMA dramatically increased the photosensitivity. Moreover, the star-shaped POSS–PMMA acting as a plasticizer dramatically enhances the mechanical properties and so reduces the photoinduced volume shrinkage of PQ/PMMA. Finally, by the use of the POSS–PMMA/PQ in a collinear holography system, it appeared to be promising for a fast but low bit error rate in holographic information storage. The current study thence has not only successfully synthesized photopolymer materials with potential for highly sensitive holographic storage applications but also investigated the microphysical mechanism of the impact of Ma-POSS on the holographic properties of PQ/PMMA photopolymer and clarified the thermal- and photoreaction processes of the POSS–PMMA/PQ photopolymer.

Phenanthraquinone-Doped Polymethyl Methacrylate Photopolymer for Holographic Recording

“…To further increase the C = C double bond content in the PMMA matrix, in 2022, Hu prepared a star-type polymer POSS–PMMA/PQ by introducing octamethylacryloyloxy polysesquisiloxane (Ma-POSS) into PQ/PMMA photopolymers [ 108 ]. Ma-POSS has eight methacryl (Ma) branches and can greatly increase the C = C double bond concentration in the matrix.…”

Theoretical and Experimental Investigations of Diffraction Characteristics Influenced by Holographic Reciprocity Effect in PQ/PMMA Polymers

“…With the arrival of the big data era, the demand for information storage density and access rate is gradually increased [ 1 , 2 , 3 ]. Since information diversity is an important resource for internet interaction and artificial intelligence, the development of low-cost, easily fabricated and compact information storage technology is urgently required, which will drive our lives into the next information age [ 4 , 5 ].…”

Bifocal-polarization holographic lens made from volume hologram

“…Based on the exposure response coefficient in tensor polarization holography [29] , we report a method to realize a bifocalpolarization holographic lens in a volume hologram. The PQ/PMMA (phenanthrenequinone-doped polymethyl methacrylate) polarization sensitive medium is used, the thickness is 1.5mm [30][31][32][33][34][35] . Two foci are generated by +1 diffracted order.…”