Issue 4, 2024

Highly sensitive and repeatable recording photopolymer for holographic data storage containing N-methylpyrrolidone

Abstract

The low photosensitivity of phenanthraquinone-doped poly(methyl methacrylate) (PQ/PMMA) severely limits its recording speed for holographic data storage. A high-performance holographic recording medium based on a unique combination of N-methylpyrrolidone (NMP) regulated PQ/PMMA has been developed. A NMP-PQ/PMMA photopolymer with high sensitivity, high diffraction efficiency and negligible volume shrinkage was successfully fabricated by tuning the composition of the PMMA matrix by varying the ratio of NMP to monomers. The photosensitivity is increased by 6.9 times (from 0.27 cm J−1 to 1.86 cm J−1), the diffraction efficiency is increased from 60% to > 80%, and volume shrinkage is decreased by a factor of 2 (from 0.4% to 0.2%). Further investigation revealed that the addition of NMP significantly reduced the molecular weight of PMMA and increased the amount of MMA residuals, while also improving the solubility of PQ molecules. More interestingly, for the first time, the NMP-PQ/PMMA material could record data information repeatedly at least 6 times. The present study elucidates that the introduction of NMP not only modulates the molecular weight of PMMA but also enables the residual monomer MMA to more easily combine with PQ to form a photoproduct for improved holographic performance.

Graphical abstract: Highly sensitive and repeatable recording photopolymer for holographic data storage containing N-methylpyrrolidone

Supplementary files

Article information

Article type
Communication
Submitted
18 10 2023
Accepted
30 11 2023
First published
04 12 2023

Mater. Horiz., 2024,11, 930-938

Highly sensitive and repeatable recording photopolymer for holographic data storage containing N-methylpyrrolidone

J. Jin, P. Hu, H. Song, J. Li, J. Wu, Z. Zeng, Q. Li, L. Wang, X. Lin and X. Tan, Mater. Horiz., 2024, 11, 930 DOI: 10.1039/D3MH01729J

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