Dynamic behavior of azobenzene polyester used for holographic data storage

2001 ◽  
Vol 674 ◽  
Author(s):  
Árpád Kerekes ◽  
E. Lörincz ◽  
Sz. Sajti ◽  
P. Várhegyi ◽  
P. S. Ramanujam ◽  
...  
Keyword(s):  
Dynamic Behavior ◽  
Data Storage ◽  
Intensity Ratio ◽  
Holographic Recording ◽  
Holographic Data Storage ◽  
Thick Sample ◽  
Model Experiments ◽  
Optimal Intensity ◽  
532 Nm ◽  
Higher Sensitivity

ABSTRACTDynamic behavior of thin photoaddressable polyester films was studied. The saturation process due to Fourier holographic recording was investigated. Model experiments show an optimal intensity ratio of the object and reference beams, where the highest efficiency occurs. This ratio is inversely proportional to the reference intensity. The material has a significantly higher sensitivity at 407 nm than at 532 nm. For 1 μm thick sample an M# of 0.25 was measurable.

scholarly journals DOPED POLY(METHYL METHACRYLATE) PHOTOPOLYMERS FOR HOLOGRAPHIC DATA STORAGE

2006 ◽  
Vol 15 (02) ◽  
pp. 239-252 ◽  
Author(s):  
SHIUAN HUEI LIN ◽  
JUNE-HUA LIN ◽  
PO-LIN CHEN ◽  
YI-NAN SHIAO ◽  
KEN Y. HSU
Keyword(s):  
Methyl Methacrylate ◽  
Data Storage ◽  
Physical Mechanism ◽  
Dynamic Range ◽  
Optical Quality ◽  
Holographic Recording ◽  
Holographic Data Storage ◽  
Poly Methyl Methacrylate ◽  
Recording Material ◽  
Good Optical Quality

In this paper, we report our investigations on thick holographic recording material of the phenanthrenequinone doped poly(methyl methacrylate) (PQ:PMMA) photopolymer. The design strategy and fabrication technique for making thick polymer samples with negligible shrinkage and good optical quality are presented. The physical mechanism for holographic recording in PQ:PMMA material is described, and methods for improving are proposed. Based on these methods, photopolymer samples with different compositions are fabricated and experimentally characterized. The results show that by modifying compositions, the material sensitivity and dynamic range for volume holographic recording have been improved.

Direct surface relief pattering of azo-polymers films via holographic recording

2014 ◽  
Vol 92 (7/8) ◽  
pp. 842-844 ◽  
Author(s):  
Jelena Aleksejeva ◽  
Mara Reinfelde ◽  
Janis Teteris
Keyword(s):  
Data Storage ◽  
Surface Relief ◽  
Polarization State ◽  
Holographic Recording ◽  
Polymeric Chain ◽  
Electric Field Direction ◽  
Direct Formation ◽  
Disperse Red 1 ◽  
Surface Relief Gratings ◽  
532 Nm

In this work surface relief direct formation during holographic recording in poly (Disperse Red 1 – methacrylate) films was studied. In this material azo-dye Disperse Red 1 is covalently attached to the main polymeric chain making lateral mass transport in the film caused by a presence of light electric field direction modulation very fast and effective. Surface relief grating formation process was induced by 532 nm laser. Read-out was performed by 660 nm diode laser. Diffraction efficiencies kinetics dependence on polarization state of reading and recording beams was studied. Surface relief depth on the films was measured by AFM. Deep surface relief gratings were obtained in Poly (Disperse Red 1 – methacrylate). Films relief can exceed the initial thickness of the sample more than three times. Fabrication of such surface relief gratings is fast and easy. They can find their application in data storage, electro-optical devices, telecommunication.

scholarly journals Compositional Changes for Reduction of Polymerisation-Induced Shrinkage in Holographic Photopolymers

2016 ◽  
Vol 2016 ◽  
pp. 1-11
Author(s):  
D. Cody ◽  
M. Moothanchery ◽  
E. Mihaylova ◽  
V. Toal ◽  
S. Mintova ◽  
...  
Keyword(s):  
Data Storage ◽  
Holographic Recording ◽  
Holographic Data Storage ◽  
Compositional Change ◽  
Monomer Molecule ◽  
Optical Elements ◽  
Interferometric Technique ◽  
Type Zeolite ◽  
Compositional Changes ◽  
Acrylamide Monomer

Polymerisation-induced shrinkage is one of the main reasons why many photopolymer materials are not used for certain applications including holographic optical elements and holographic data storage. Here, two compositional changes for the reduction of shrinkage in an acrylamide-based photopolymer are reported. A holographic interferometric technique was used to study changes in the dynamics of the shrinkage processes occurring in the modified photopolymer during holographic recording in real time. Firstly, the effect of the replacement of the acrylamide monomer in the photopolymer composition with a larger monomer molecule, diacetone acrylamide, on polymerisation-induced shrinkage has been studied. A reduction in relative shrinkage of 10–15% is obtained using this compositional change. The second method tested for shrinkage reduction involved the incorporation of BEA-type zeolite nanoparticles in the acrylamide-based photopolymer. A reduction in relative shrinkage of 13% was observed for acrylamide photopolymer layers doped with 2.5% wt. BEA zeolites in comparison to the undoped photopolymer.

Improved phase retrieval in holographic data storage based on a designed iterative embedded data

2021 ◽  
Author(s):  
Changyu Yu ◽  
Suping Wang ◽  
Ruixian Chen ◽  
Jianying Hao ◽  
Qijing Zheng ◽  
...  
Keyword(s):  
Data Storage ◽  
Phase Retrieval ◽  
Holographic Data Storage

scholarly journals Dynamic speckle multiplexing scheme in volume holographic data storage and its realization

2003 ◽  
Vol 11 (4) ◽  
pp. 366 ◽  
Author(s):  
Qingsheng He ◽  
Jinnan Wang ◽  
Jiangang Wang ◽  
Minxian Woo ◽  
Guofan Jin
Keyword(s):  
Data Storage ◽  
Holographic Data Storage ◽  
Dynamic Speckle ◽  
Volume Holographic Data Storage

Random modulation in high-density holographic data storage and correlation recognition system

2003 ◽  
Author(s):  
Guofan Jin ◽  
Liangcai Cao ◽  
Qingsheng He ◽  
Haoyun Wei ◽  
Minxian Wu
Keyword(s):  
Data Storage ◽  
Recognition System ◽  
High Density ◽  
Holographic Data Storage ◽  
Random Modulation
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