Reaction-diffusion model applied to high resolution Bayfol HX photopolymer

Bruder, Friedrich‐Karl; Deuber, Francois; Fäcke, Thomas; Hagen, Rainer; Hönel, Dennis; Jurbergs, David; Rölle, Thomas; Weiser, Marc‐Stephan

doi:10.1117/12.841956

Cited by 36 publications

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“…In fact the results in [7] have been extended, in [10,8], to include reflection geometry gratings, (which we first studied in 2001, [11]), for spatial frequencies up to ∼4800 lines∕mm. Furthermore, the predictions of the NPDD model for spatial frequencies up to 5000 l∕mm in a Bayer MaterialScience material have been confirmed, [12], and a detailed comparison of the spatial frequency performance of the Bayer material with the equivalent results in AA/PVA is presented [13]. These results all support the treatment of diffusion reported in [1,2].…”

Section: Replysupporting

confidence: 73%

Monomer diffusion rates in photopolymer material: Part I Low spatial frequency holographic gratings: reply

Sheridan

Gleeson

2012

J. Opt. Soc. Am. B

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(Doc. ID 154663); published 0 MONTH 0000In [1,2] an error (by a factor of 1000) in the diffusion rate of monomer in a photopolymer material used by the authors of [3], is presented. In [3] no errors are identified in our analysis and our physical evidence is not addressed. It is implied that our model and our results are disproven by the results in the papers referenced in [3]. In fact these papers do not provide any such quantitative evidence. The observations made regarding the significance of the authors' contributions, in particular the validity of their model and the practical importance of their material are also discussed. © 2012 Optical Society of America OCIS codes: 090.0090, 050.2770, 050.7330, 160.5470, 090.2900. REPLYIn our two part paper [1,2] we demonstrate that an error has been made by Toal et al. [3,4] in relation to their interpretation of their experimental results for their acrylamide/polyvinyl alcohol (AA/PVA) photopolymer material. We show that their value for the rate of monomer diffusion in their AA/PVA, 10 −7 cm 2 ∕s, is incorrect by a factor of 1000. Our estimated value, of 10 −10 cm 2 ∕s, agrees with typical values found using the nonlocal photo-polymerisation driven diffusion model, (NPDD). In the second part of our paper we place their diffusion value within the context of other materials. These results are neglected in [3]. Despite the large size and the serious consequences of the error identified in [1,2], the authors of [3] have chosen not to report on their attempts to repeat our analysis so as to quantitatively disprove our results. Instead in relation to our results, Toal et al. [3] first state that our values encompass theirs. Then they imply that the differences may arise due to differences in the material composition. Finally they state that our material composition is in fact identical to theirs and that we have given the false impression that we developed this material. Most of the actual text in [3] however involves a long listing of their papers, all of which contain interpretations of the material behavior that our paper [1,2] Figure 7). Such disagreements, of between 500% and 3900%, (following >15 years of model development), do not indicate an accurate physical understanding of the material behavior. Furthermore such differences cannot be simply explained away by arbitrarily changing the values of the component refractive indices. We note that the NPDD model, introduced by Sheridan et al. in 2000 [5], (see [6][7][8]), does not suffer from any such quantitative uncertainty. When using the NPDD model, accurately measured component refractive index values are used, see [9], in agreement with tabulated values from the general literature. The NPDD model permits the inhibition, short exposure and postexposure effects to be quantitatively predicted. Most significantly in relation to [3], these quantitative results support the value of monomer diffusion reported in [1,2]. While several other papers are cited in [3] to support the authors' claims, we must emphasize that no...

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Section: Replysupporting

confidence: 73%

Monomer diffusion rates in photopolymer material: Part I Low spatial frequency holographic gratings: reply

Sheridan

Gleeson

2012

J. Opt. Soc. Am. B

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“…It must be noted at this point that reflection geometries are being examined in both media and the observed trend shown here in Fig. 5 holds true [41][42][43]. …”

Section: Bms Photopolymermentioning

confidence: 99%

Comparison of a new self developing photopolymer with AA/PVA based photopolymer utilizing the NPDD model

Gleeson¹,

Sheridan²,

Bruder³

et al. 2011

Opt. Express

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Abstract:The development of suitable recording media for applications such as holographic optical elements and holographic data storage are of significant research and commercial interest. In this paper, a photopolymer material developed by Bayer MaterialScience is examined using various optical techniques and then characterised using the Non-local Photopolymerization Driven Diffusion model. This material demonstrates the capabilities of a new class of photopolymer offering high index modulation, full colour recording, high light sensitivity and environmental stability. One key result of this study is the material's high spatial frequency resolution, indicating a very low non-local effect, thus qualifying it as a very good storage medium. ©2011 Optical Society of America References and links1. L. Dhar, A. Hale, H. E. Katz, M. L. Schilling, M. G. Schnoes, and F. C. Schilling, "Recording media that exhibit high dynamic range for digital holographic data storage," Opt. Lett. 24(7), 487-489 (1999).

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“…In ref. 6 we showed that for saturation recording the i th harmonic Δn i of the index profile Δn depends only on S. And by this, higher harmonics in the index profile will appear with increasing total recording power P, because a higher recording power creates more reaction centers that increase the conversion of monomer and with that the reaction time τ R (to polymerize the monomers) is reduced. On the other hand decreasing the spatial frequency SF of the interference pattern means a larger grating period and with that the monomers have to diffuse a longer distance as well, leading to an increased diffusion time τ D .…”

Section: How Higher Harmonics Of the Index Profile In Volume Phase Grmentioning

confidence: 95%

“…This is exactly in line with our findings in ref. 6 that with saturation recording the Δn i depend only on the system parameter S. Figure 11: Experimental grade A in geometry III. Left: Filled symbols are fitted Δn 1 and Δn 2 ; Right: Filled symbols are measured η 1 and η 2 ; versus the total recording power P R + P S at a fixed total recording dosage E R + E S = 95.5 mJ/cm 2 .…”

Section: Geometry IIImentioning

confidence: 98%

Edge-lit volume holograms recorded by free space exposure: diffraction by 2^ndHarmonics in Bayfol HX film

et al. 2015

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Miniaturization of optical components, specifically the reduction in thickness created by using planar optical devices, makes light manipulation by diffraction more and more attractive. Optical gratings based on volume Holographic Optical Elements (vHOEs) have the advantage over surface gratings as they reconstruct only a single diffraction order and hence provide high diffraction efficiencies, selectivity and remain fully transparent in the off-Bragg condition.Guiding light inside an optically transparent medium by total internal reflection (TIR) is common and useful in thin planar optical devices. vHOEs offer unique ways to create selective in-and out-coupling of TIR light. As such vHOEs typically have to be recorded in an edge-lit configuration as the necessary high diffraction angles could not be generated by two free-space beams outside the medium. To record such an edge-lit vHOE, bulky recording blocks or liquid baths are used in complex and hard to align recording setups.We present in this paper our findings to use instant-developing photopolymer film (Bayfol ® HX) to generate 2 nd harmonics in the index profile of phase gratings while using free-space recording setups. Those 2 nd harmonic components enable the vHOE to diffract at such large angles that they replay in an edge-lit configuration. We will discuss in this paper selected materials and beneficial recording parameters to tune the diffraction efficiency towards 2 nd harmonic replay. By this -in reported specific cases -the cumbersome and complex edge-lit recording can be substituted by easy-to-use free-space setups. This process significantly simplifies master recordings for vHOEs with edge-lit functionalities which later can be used in contact copy schemes for mass replication.

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Reaction-diffusion model applied to high resolution Bayfol HX photopolymer

Cited by 36 publications

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Monomer diffusion rates in photopolymer material: Part I Low spatial frequency holographic gratings: reply

Monomer diffusion rates in photopolymer material: Part I Low spatial frequency holographic gratings: reply

Comparison of a new self developing photopolymer with AA/PVA based photopolymer utilizing the NPDD model

Edge-lit volume holograms recorded by free space exposure: diffraction by 2^ndHarmonics in Bayfol HX film

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Reaction-diffusion model applied to high resolution Bayfol HX photopolymer

Cited by 36 publications

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Monomer diffusion rates in photopolymer material: Part I Low spatial frequency holographic gratings: reply

Monomer diffusion rates in photopolymer material: Part I Low spatial frequency holographic gratings: reply

Comparison of a new self developing photopolymer with AA/PVA based photopolymer utilizing the NPDD model

Edge-lit volume holograms recorded by free space exposure: diffraction by 2ndHarmonics in Bayfol HX film

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Edge-lit volume holograms recorded by free space exposure: diffraction by 2^ndHarmonics in Bayfol HX film