Photopolymers for Digital Holographic Data Storage

Dhar, Lisa; Schnoes, Melinda; Katz, Howard E.; Hale, A.; Schilling, M. L.; Harris, A. L.

doi:10.1007/978-3-540-47864-5_11

Cited by 26 publications

(25 citation statements)

References 24 publications

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“…Measured values for S are larger than the required minimum value of 500 cm/J for HDS media. 8 We consider that a strong concentration dependence of S is caused by a rapid increase in R p with increasing photoinitiator concentrations as seen in Fig. 4.…”

Section: Resultsmentioning

confidence: 98%

“…%) used in our experiment are thicker than 500 lm for recording at blue laser wavelengths, satisfying the thickness requirement (>500 lm) for HDS media. 8 It can also be seen that Darocur TPO can be decomposed after curing without creating any post-forming absorption bands in the visible spectrum. This observation is of practical importance since such an NPC film with a holographic grating has also very low absorption at a readout wavelength of 404 nm.…”

Section: A Sample Preparationmentioning

confidence: 96%

“…7 Measured values for Dn sat and S exceeded the required minimum values of 5 Â 10 À3 and 500 cm/J, respectively, for HDS media. 8 Following our first demonstration of volume holographic recording in methacrylate-based NPCs incorporating TiO 2 nanoparticles, 3 acrylate-based NPCs incorporating similar and other inorganic nanoparticles (e.g., nanozeolites, semiconductor quantum dots, and LaPO 4 ) 9-13 as well as inorganic species introduced at a molecular level 14 were also reported. In addition, UV-and blue-sensitized holographic media were reported by use of (meth)acrylate-based NPCs (Refs.…”

Section: Introductionmentioning

confidence: 97%

“…[18][19][20] Despite large Dn sat and high thermal stability of volume gratings recorded in (meth)acrylate-based NPCs, shrinkage was at best a few %, still larger than the required value (<0.5%) for HDS applications. 8 This is due to the fact that all these reported NPCs employed monomers capable of free radical mediated chain-growth polymerizations in which gelation takes place early in conversion since high-molecularweight polymer is formed immediately in the crosslinking polymerization process. This problem of using (meth) acrylate-based NPCs can be relaxed to some extent by the addition of chain-transfer agents by which rapid gelation is delayed and thereby shrinkage can be reduced.…”

Section: Introductionmentioning

confidence: 98%

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Characterization of volume holographic recording in photopolymerizable nanoparticle-(thiol-ene) polymer composites at 404 nm

Kawana

Takahashi

Yasui

et al. 2015

Journal of Applied Physics

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We report on the photopolymerization dynamics and the volume holographic recording properties of a thiol-ene based nanoparticle-polymer composite (NPC) doped with a blue-sensitive photoinitiator, Darocur V R TPO, by using a highly coherent blue diode laser operating at a wavelength of 404 nm. Our study indicates that volume gratings recorded in the NPC amount to meeting the material requirements of refractive index modulation and material recording sensitivity for holographic data storage media. It is also found that polymerization shrinkage of recorded NPC gratings is higher than that of the same thiol-ene based NPC with a green (523 nm)-sensitive photoinitiator, Irgacure V R 784/BzO 2 . We attribute such a difference in shrinkage to the photopolymerization dynamics at these recording wavelengths. We show that this shrinkage increase at 404 nm can be mitigated to some extent by controlling the thiol-ene stoichiometry in the NPC. V C 2015 AIP Publishing LLC. [http://dx.

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Section: Resultsmentioning

confidence: 98%

Section: A Sample Preparationmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

Characterization of volume holographic recording in photopolymerizable nanoparticle-(thiol-ene) polymer composites at 404 nm

Kawana

Takahashi

Yasui

et al. 2015

Journal of Applied Physics

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show abstract

“…Lucent, for example, has developed a free-radical photopolymer system that utilizes two independently polymerizable and compatible chemical subsystems [115]. One subsystem defines a polymer matrix scaffold in situ using low-index polymer precursors.…”

Section: Photopolymer Materialsmentioning

confidence: 99%