Imaging of Volume Phase Gratings in a Photosensitive Polymer, Recorded in Transmission and Reflection Geometry

Sabel, Tina; Zschocher, Michael

doi:10.3390/app4010019

Cited by 8 publications

(14 citation statements)

References 20 publications

(42 reference statements)

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“…The volumetric shrinkage of this material system is 2% in average [7]. For more details on sample preparation, hologram recording and specific material characteristics, see [7,9,11,13].…”

Section: Hologram Generationmentioning

confidence: 99%

“…Research efforts are concentrated on material composition, processing and sample fabrication on the one hand [7][8][9][10], and on techniques and methods applied for recording and subsequent analysis on the other hand [7,9,[11][12][13][14][15][16]. In each case, there is a particular need to meet the high demands on precision and repetitive accuracy, accompanying volume holographic operations.…”

Section: Introductionmentioning

confidence: 99%

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Spatially Resolved Analysis of Bragg Selectivity

Sabel¹

2015

Applied Sciences

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This paper targets an inherent control of optical shrinkage in photosensitive polymers, contributing by means of spatially resolved analysis of volume holographic phase gratings. Point by point scanning of the local material response to the Gaussian intensity distribution of the recording beams is accomplished. Derived information on the local grating period and grating slant is evaluated by mapping of optical shrinkage in the lateral plane as well as through the depth of the layer. The influence of recording intensity, exposure duration and the material viscosity on the Bragg selectivity is investigated.

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“…The volumetric shrinkage of this material system is 2% in average [7]. For more details on sample preparation, hologram recording and specific material characteristics, see [7,9,11,13].…”

Section: Hologram Generationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spatially Resolved Analysis of Bragg Selectivity

Sabel¹

2015

Applied Sciences

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“…Therefore, metrology of a volume grating is challenging. Sabel and Zschocher avoided the limit of resolution and achieved the image of the volume phase gratings recorded in polymer using an optical microscopy [25]. Braun and co-workers had tried to monitor the eventual status of nanoparticle distribution in the holographic gratings using transmission electron microscopy Appl.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Volume Gratings Based on Distributed Dielectric Constant Model Using Mueller Matrix Ellipsometry

Jiang

et al. 2019

Applied Sciences

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Volume grating is a key optical component due to its comprehensive applications. Other than the common grating structures, volume grating is essentially a predesigned refractive index distribution recorded in materials, which raises the challenges of metrology. Although we have demonstrated the potential application of ellipsometry for volume grating characterization, it has been limited due to the absence of general forward model reflecting the refractive index distribution. Herein, we introduced a distributed dielectric constant based rigorous coupled-wave analysis (RCWA) model to interpret the interaction between the incident light and volume grating, with which the Mueller matrix can be calculated. Combining with a regression analysis with the objective to match the measured Mueller matrices with minimum mean square error (MSE), the parameters of the dielectric constant distribution function can be determined. The proposed method has been demonstrated using a series of simulations of measuring the volume gratings with different dielectric constant distribution functions. Further demonstration has been carried out by experimental measurements on volume holographic gratings recorded in the composite of polymer and zinc sulfide (ZnS) nanoparticles. By directly fitting the spatiotemporal concentration of the nanoparticles, the diffusion coefficient has been further evaluated, which is consistent to the result reported in our previous investigations.

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“…These theories are also useful to study the deviation from the sinusoidal profile provided by the higher orders. In many of the shrinkage models reported [9][10][11][12][13][14][15][16][17], it is supposed that the sinusoidal profile remains after the shrinkage occurs. If there is any deviation from this profile during the shrinkage, it is supposed to be a variation in the higher diffracted orders.…”

Section: Study Of the Diffracted Ordersmentioning

confidence: 99%

Shrinkage measurement for holographic recording materials

et al. 2017

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There is an increasing demand for new holographic recording materials. One of them are photopolymers, which are becoming a classic media in this field. Their versatility is well known and new possibilities are being created by including new components, such as nanoparticles or dispersed liquid crystal molecules in classical formulations, making them interesting for additional applications in which the thin film preparation and the structural modification have a fundamental importance. Prior to obtaining a wide commercialization of displays based on photopolymers, one of the key aspects is to achieve a complete characterization of them. In this sense, one of the main parameters to estimate and control is the shrinkage of these materials. The volume variations change the angular response of the hologram in two aspects, the angular selectivity and the maximum diffraction efficiency. One criteria for the recording material to be used in a holographic data storage application is the shrinkage, maximum of 0.5%. Along this work, we compare two different methods to measure the holographic recording material shrinkage. The first one is measuring the angle of propagation for both diffracted orders ±1 when slanted gratings are recorded, so that an accurate value of the grating vector can be calculated. The second one is based on interference measurements at zero spatial frequency limit. We calculate the shrinkage for three different photopolymers: a polyvinyl alcohol acrylamide (PVA/AA) based photopolymer, one of the greenest photopolymers whose patent belongs to the Alicante University called Biophotopol and on the last place a holographic-dispersed liquid crystal photopolymer (H-PDLC)..

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Imaging of Volume Phase Gratings in a Photosensitive Polymer, Recorded in Transmission and Reflection Geometry

Cited by 8 publications

References 20 publications

Spatially Resolved Analysis of Bragg Selectivity

Spatially Resolved Analysis of Bragg Selectivity

Characterization of Volume Gratings Based on Distributed Dielectric Constant Model Using Mueller Matrix Ellipsometry

Shrinkage measurement for holographic recording materials

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