Fabrication of nanodiamond-dispersed composite holographic gratings and their light and slow-neutron diffraction properties

Tomita, Yasuo; Kageyama, Akihisa; Iso, Yuko; Umemoto, Koichi; Kume, Atsushi; Liu, Ming; Pruner, Christian; Jenke, Tobias; Roccia, S.; Geltenbort, P.; Fally, Martin; Klepp, Jürgen

doi:10.1103/physrevapplied.14.044056

Cited by 7 publications

(7 citation statements)

References 70 publications

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“…Then the thickness is doubled since d → d(ζ) = d/ cos(ζ). 12,16,53,54 The outcome for the simple configuration SPPS (configuration 1) is depicted in Fig. 6(c…”

Section: Sppsps or Spsppsmentioning

confidence: 99%

“…First attempts with holographically produced thinner gratings (a few tens of micrometers) with holographic polymer dispersed liquid crystals paved the way. [8][9][10] Next, various nanoparticle-polymer composites of excellent quality proved to be extremely efficient, reliable and versatile [11][12][13][14][15][16] and are the top-materials for neutrons at present with [b c ∆ρ] 1 ≤ 10 µm −2 , whereas photopolymer-ionic liquid composites have so far not reached the same level in [b c ∆ρ] 1 . 17…”

Section: Introductionmentioning

confidence: 99%

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Multilayer volume holographic gratings from BayFol HX: light and neutron optical characteristics

Jenke

Pruner

Klepp

et al. 2023

Holography: Advances and Modern Trends VIII

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During the last decade a number of volume holographic media have been investigated that could serve not only as diffractive optical elements (DOEs) for light but also for slow neutrons. In this contribution we discuss the light optical properties of a stack of two gratings separated by an optically inert slice recorded in a Bayfol®HX photopolymer. While the refractive-index modulation of the gratings for light is remarkable, the corresponding neutron optical analogue is, so far, in the medium range of other materials investigated. We therefore aim at possible improvements which are discussed in this manuscript.

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“…Then the thickness is doubled since d → d(ζ) = d/ cos(ζ). 12,16,53,54 The outcome for the simple configuration SPPS (configuration 1) is depicted in Fig. 6(c…”

Section: Sppsps or Spsppsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multilayer volume holographic gratings from BayFol HX: light and neutron optical characteristics

Jenke

Pruner

Klepp

et al. 2023

Holography: Advances and Modern Trends VIII

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“…To address this challenge and attain a high ∆n, recent studies have primarily focused on developing high-refractive-index monomers 1,2 , incorporating high-refractive-index organic 3 4 and inorganic nanoparticles 5 , and synthesizing low-refractiveindex matrix 6 to enhance the theoretical maximum refractive index difference. High refractive index modulations above 0.035 have been achieved in many of these attempts in specific spatial frequencies.…”

Section: Introductionmentioning

confidence: 99%

Use of molecular design and synthesis to improve polymeric holographic photopolymer materials

Hu,

Alim,

Mavila

et al. 2024

Advances in Patterning Materials and Processes XLI

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Breakthroughs in holographic optical devices frequently rely on advances in high-refractive-index photopolymer materials (HRIPs). While significant progress has been made in the pursuit of HRIPs, additional considerations have prevented broad application of photopolymerization-based materials for fabricating high-performance holographic gratings. To address the deficiency of suitable high-refractive-index monomers for holographic recording, our recent works were conducted from two main aspects, which are (1) monomer synthesis to improve the theoretical refractive index contrast between photopolymer and matrix (or binder), and (2) formulation manipulation for improving segregation degree between photopolymer and matrix (or binder). We have explored several synthetic approaches to obtain high-refractive-index acrylate monomers (nD= 1.6) of high miscibility with matrix, multifunctional low-viscosity, high-refractive-index thiolene and thiol-yne monomers (nD= 1.6). Combining with polyurethane matrix (binder) with a refractive index of 1.48, these monomers exhibit a high theoretical peak-to-valley index contrast of more than 0.12. To fully utilize the high theoretical index contrast, thiol-ene click chemistry in combination with a linear functionalized polymer binder was explored to achieve a high refractive index modulation(peak-to-mean) close to 0.04. Meanwhile, in the thiol-ene formulations, a variety of chemical modification methods, which can be readily translated into other material systems, were proposed, and studied to manipulate the rates of reaction and diffusion processes during holographic recording to optimize the refractive index modulation. The dramatic difference of achievable refractive index modulation in similar thiol-ene formulations with close theoretical index contrast was observed in such study. The difference underscores the importance of customized strategies and systematic formulation manipulation for achieving high-performance holographic photopolymers.

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“…12 Other organic nanoparticles using carbon allotropes such as nanodiamond and carbon nanotube were also reported very recently. [13][14][15] We developed holographic NPC gratings using various types of HBPs (refractive indices of 1.51 and 1.61 at 532 nm) and photopolymers with free radical mediated chain-growth, cationic ring-opening and thiol-ene polymerizations. 12,16,17 In all these works holographic NPC gratings of 1-µm spacing were recorded in the green (532 nm) and they had ∆n sat as large as 8×10 −3 at a readout wavelength of 532 nm.…”

Section: Introductionmentioning

confidence: 99%

Panchromatic recording of nanocomposite holographic gratings with large refractive index modulation amplitudes

Tomita,

Narita,

Hasegawa

2024

Photosensitive Materials and Their Applications III

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A photopolymerizable nanoparticle-polymer composite (NPC) is a novel nanocomposite photopolymer that is dispersed with inorganic nanoparticles having a large refractive-index difference from that of the formed polymer. In order to realize the uniform and high dispersion of nanoparticles without any aggregation, we employ nanostructured polymers that possess highly branched main chains, the so-called hyperbranched polymer (HBP), as size and refractive-index controllable organic nanoparticles with its ultrahigh refractive index. We show that high dispersion of the ultrahigh refractive index HBP in a photopolymerizable NPC provides a volume holographic grating possessing the saturated refractive modulation amplitude as large as 0.03 at grating spacing of 0.5-µm in all the visible spectral regions of the red (640nm), the green (532nm) and the blue (405nm). Such a high contrast volume holographic grating can be used for volume optical holographic elements in a wearable headset for augmented and mixed reality.

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Fabrication of nanodiamond-dispersed composite holographic gratings and their light and slow-neutron diffraction properties

Cited by 7 publications

References 70 publications

Multilayer volume holographic gratings from BayFol HX: light and neutron optical characteristics

Multilayer volume holographic gratings from BayFol HX: light and neutron optical characteristics

Use of molecular design and synthesis to improve polymeric holographic photopolymer materials

Panchromatic recording of nanocomposite holographic gratings with large refractive index modulation amplitudes

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