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

Abstract

Schematic diagram of NMP-PQ/PMMA for collinear holographic data storage.

High-performance photopolymers for recording transmission/reflection holographic gratings

“…In addition, volatile photopolymers have poor dimensional and thermal stability, which limits their practical applications 7 . Two-stage photopolymers can avoid the use of organic solvents [8][9][10] , but there are only a few holographic photopolymers in the literature having Δn above 0.02 5,11,12 . In addition, reflection VHGs are required to meet the application requirements in the AR field 3 .…”

High-Performance Holographic Photopolymers Based on Low Refractive Index Host Matrices Containing Fluoroelastomers

“…Photopolymers for holographic recording consist of three main components: photoinitiating system, host matrix, and writing monomer. ,, The host matrix (also known as a binder or film-forming resin) plays a role in shaping and supporting to provide mechanical stability for the photopolymer. , During holographic exposure, the monomers in bright fringes undergo polymerization first. Then, a concentration gradient is generated between the bright and dark fringes, which drives the monomers in the dark fringes to migrate to the bright fringes. , Meanwhile, the host matrix in the bright fringes is squeezed into dark fringes .…”

Cross-Linking Degree Modulated Highly Sensitive Photopolymer for Holographic Data Storage by Introducing 1,3,5,7-Tetravinyl-1,3,5,7-tetramethylcyclotetrasiloxane

“…The exponential growth of datasphere will shoot up to 175 ZB in 2025; therefore, severe challenges will be coming for the existing data storage system. − Holographic data storage, − employing multiple coherent laser beams recording the information onto the photosensitive medium, is recognized as a promising next generation eco-friendly data storage technology with huge capacity and high storage speed, having achieved unprecedented development the over past decades. − Various materials have been used for holographic data storage, ,,− but a lack of appropriate high-sensitivity storage materials remains a major obstacle toward the fully practical application of volume holographic data storage. , The excellent characteristics of low photoinduced volume shrinkage and chemical stability facilitate phenanthraquinone/poly­(methyl methacrylate) (PQ/PMMA) photopolymer’s application on holographic storage as an economic optical storage medium, nevertheless, itself heavily constrained by its intrinsic poor holographic performance, especially the low photosensitivity and inadequate diffraction efficiency and refractive index modulation. − More previous reports show that, as a photosensitizer at 532 nm, PQ will react with CC more rapidly during exposure; , thence, various strategies have been proposed to improve the holographic properties of PQ/PMMA by increased the double bond content using co-monomer. ,− In general, the CC bond from the hyperbranched co-monomer will promote the formation of cross-linked (grafted) macromolecules. ,,, However, the influence of cross-linking degree on the holographic properties of photopolymers is rarely mentioned, and the physical mechanism remains unclear.…”