Polarization holographic characteristics of TI/PMMA polymers by linearly polarized exposure

Liu, Peng; Sun, Xingming; Wang, Linlin

doi:10.1016/j.optmat.2020.109992

Cited by 14 publications

(11 citation statements)

References 22 publications

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“…The intensities of both beams were adjusted to 0.127 W cm −2 (green laser, 532 nm). The interference angle 49 between the signal and reference beams was set to 24°, the diffraction efficiency was measured every 6 s, and the reconstruction duration was set to 0.4 s. The diffraction efficiency η is determined by eqn (1):where I +1 and I 0 denote the intensities of the first-order diffracted and transmitted beams, respectively. The photosensitivity factor ( S ) 50 of the materials and volume shrinkage ( σ ) 51 of each sample are determined as follows (eqn (2) and (3)):where I is the intensity of the signal beam (0.127 W cm −2 ), d is the thickness of the photopolymer (1.5 mm), and η is the diffraction efficiency.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The intensities of both beams were adjusted to 0.127 W cm À2 (green laser, 532 nm). The interference angle 49 between the signal and reference beams was set to 241, the diffraction efficiency was measured every 6 s, and the reconstruction duration was set to 0.4 s. The diffraction efficiency Z is determined by eqn (1):…”

Section: Holographic Measurements and Recordingsmentioning

confidence: 99%

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

Jin,

Hu,

Song

et al. 2024

Mater. Horiz.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Holographic Measurements and Recordingsmentioning

confidence: 99%

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

Jin,

Hu,

Song

et al. 2024

Mater. Horiz.

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show abstract

“…The green laser (532 nm) with the intensity of 0.127 W/cm 2 was applied in the current study. The temporal diffraction efficiency was recorded per 6 s at the cross-angle of 24°, and the reading time was set to 0.4 s. The diffraction efficiency η is expressed as where I + 1 and I 0 represent the intensities of the first-order grating diffraction and the transmitting beams, respectively. The photosensitivity factor S of materials is expressed as where I represents the intensity value of the signal beam (0.127 W cm –2 ), d is the thickness of photopolymers (1.5 mm), and η is the diffraction efficiency.…”

Section: Experimental Sectionsmentioning

confidence: 99%

“…The green laser (532 nm) with the intensity of 0.127 W/cm 2 was applied in the current study. The temporal diffraction efficiency was recorded per 6 s at the cross-angle of 24°, 66 and the reading time was set to 0.4 s. The diffraction efficiency η is expressed as…”

Section: ■ Experimental Sectionsmentioning

confidence: 99%

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

Jin

et al. 2022

ACS Appl. Mater. Interfaces

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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.

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“…This kind of photopolymer exhibits better holographic properties than that of PQ/PMMA [ 16 ]. Meanwhile, TI/PMMA polymers can record holographic intensity and polarization modulated gratings through long-time (second level) and short-time (millisecond level) exposure [ 17 , 18 , 19 ], exemplifying the competitiveness of holographic storage applications.…”

Section: Introductionmentioning

confidence: 99%

Holographic Grating Enhancement of TI/PMMA Polymers in the Dark Diffusion Process

Liu

Sun

2021

Polymers

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The dark diffusion enhancement process (DDEP) caused by photopolymerization during the pre-exposure of TI/PMMA (titanocene dispersed methyl methacrylate matrix) polymers was theoretically analyzed and experimentally investigated, revealing the holographic grating enhancement of TI/PMMA polymers in the post-exposure process without additional operations. The diffusion of photo-initiators and photoproducts dominated the grating enhancement process after exposure. We adopted two pre-exposure methods, long-time (second level) and short-time (millisecond level) laser exposure, at 532 nm, to investigate the DDEP during the post-exposure process. A five-fold enhancement in grating strength was achieved in consecutive long-time pre-exposures, while a two-fold grating development was examined after short-time exposure. Additionally, the exposure durations and repetition rates influenced the grating increment of the DDEP. This study provided a basis for the feasibility of holographic application in TI/PMMA photopolymers via the dark diffusion effect.

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Polarization holographic characteristics of TI/PMMA polymers by linearly polarized exposure

Cited by 14 publications

References 22 publications

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

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

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

Holographic Grating Enhancement of TI/PMMA Polymers in the Dark Diffusion Process

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