Holographic Storage Characteristics of PQ/poly(methyl methacrylate) have been significantly improved by
doping metallic ion Yb+3 and Er+3. The hybrid materials display significant enhancement in the holographic
characteristics. The diffraction efficiency promote to 59% with Yb+3, to 47% with Er+3 from the undoped sample
is 40%. The increment is up to 47% in Yb+3 sample; the dynamic range enhance to 2.12 and 1.58 on Yb+3 and
Er+3 containing sample individually in comparison to 1.16 for the undoped copolymer. The increment of
dynamic range is up to 82% for Yb+3 containing sample. The related mechanism of these changes is preliminary
discussed with the analysis of UV-vis, FT-IR and Photoluminescence spectroscopy.
We fabricate two phenanthrenequinone-doped copolymers which can improve the holographic recording characteristics of phenanthrenequinone-doped poly(methyl-methacrylate) (PQ/PMMA) photopolymer. In these materials, the polymer matrix of PQ/PMMA is modified to be copolymers, which composed of either poly(methyl-methacrylate-co -trimethylolpropane-triacrylate) or poly(methyl-methacrylate-co-acrylic acid 2-phenoxyethyl ester), respectively. With the chemical analyses of these materials before and after light exposure, we investigate the physical mechanism of the holographic recording in those copolymer samples. In addition, the holographic characteristics of different samples, including dynamic range and sensitivity, have been measured. These experimental results demonstrate that modification of the monomers is an efficient method to improve the material properties.
Photopolymers have been applied widely in optical devices for communications, displays, bio-sensing, and data storage. The advantages of this material are easy to synthesize, high refractive index change, high sensitivity and good optical quality. Recently, we have investigated on the syntheses and analysis of 9,10-PhenanthreneQuinone doped Poly(MethylMethAcrylate) (PQ:PMMA) photopolymer. This material can be fabricated with large dimensions and with thickness in the range of several-centimeters. Experiments show that the material shrinkage is negligible after optical exposure such that our doped photopolymer is attractive for volume holographic applications. However, comparing with other photopolymers, our PQ:PMMA material has a drawback of lower sensitivity (~10 mW/cm2). In this presentation, we demonstrate that by adding organo-metallic compound (Zinc MethylAcrylate, ZnMA) into the PQ:PMMA photopolymer, we succeeded in reducing response time and increasing holographic diffraction efficiency of the material. We report the fabrication and experimental investigation of dye-doped photopolymer, and discuss their application for data storage.
KEYWORDS: Molecules, Holography, Holograms, Absorption, Polymers, Polymethylmethacrylate, Chemical analysis, Hydrogen, Chemical species, Refractive index
The photoproducts in phenanthrenequinone (PQ)-dissolved methyl methacrylate (MMA) liquid samples and PQ-doped poly(methyl methacrylate) (PQ/PMMA) solid photopolymer samples have been analyzed by various chemical measurements. A mechanism for holographic recording in our PQ/PMMA photopolymer is proposed. By UV-VIS transmission and photoluminescence spectral measurements, we find that under light exposure the molecular structure of PQ is transformed to be less conjugated. The measured results of mass spectra, Fourier transform infrared spectra, NMR spectra, and gel permeation chromatograph analyses provide some evidence for recognizing the molecular structure of the photoproducts in our PQ/PMMA photopolymers. The results show that under light exposure the PQ and MMA form new molecules, mainly an adduct of one PQ molecule with one MMA molecule. In addition, PQ also reacts as a photoinitiator to form PMMA oligomers in our samples. The structure change of the PQ molecule induces a strong change of the refractive index in the material. It provides a mechanism to record a phase hologram in our PQ/PMMA photopolymer. Holographic recordings in the samples are demonstrated, and the dynamic range of the sample is investigated.
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