Optical Properties of Photopolymer Layers Doped with Aluminophosphate Nanocrystals

Leite, Ema Sacadura; Babeva, Tsvetanka; Ng, E. P.; Toal, Vincent; Mintova, Svetlana; Naydenova, Izabela

doi:10.1021/jp1060073

Cited by 39 publications

(37 citation statements)

References 36 publications

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“…They can function as gratings, lenses, beam splitters, spectral filters, shear elements, achromats, mirrors, birefringent elements, and multi-function elements. They can be used, for example, in optical sensors [1][2][3][4][5][6][7], fibre-optics [8][9][10][11], optical scanners [12][13][14], optical disk pick-up heads [15][16] as well as holographic concentrators [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Using acrylamide-based photopolymers for fabrication of holographic optical elements in solar energy applications

Akbari¹,

Naydenova²,

Martin³

2014

Appl. Opt.

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A holographic device is under development that aims to improve light collection in solar cells. The aim is to explore the potential of using photopolymer Holographic Optical Elements (HOE) to collect light from a moving source, such as the sun, and re-direct it for concentration by a holographic lens.. A working range of 45 degrees is targeted for such a device to be useful in solar applications without tracking. A photopolymer HOE is capable of efficiently re-directing light, but the angular selectivity of a single grating is usually of the order of one degree at the thicknesses required for high efficiency. The challenge here is to increase the angular and wavelength range of the gratings so that a reasonable number may be multiplexed and/or combined to provide a device that can concentrate light incident from a large range of angles. In this paper low spatial frequency holographic recording is explored in order to increase the angular and wavelength range of an individual grating. Ultimately, a combination of gratings will be used so that a broad range of angles of incidence are accepted. A design is proposed for the combination of such elements into a holographic solar collector. The first step in achieving this is optimization of recording at low spatial frequency. This requires a photopolymer material with unique properties, such as a fast monomer diffusion rate. This paper reports results on the efficiency of holograms recorded in an acrylamide based photopolymer at low spatial frequencies (100, 200 and 300 l/mm). The diffraction efficiency and angular selectivity of recorded holograms have been studied for various photopolymer layer thicknesses and different intensities of the recording beams. A diffraction efficiency of over 80% was achieved at a spatial frequency of 200 l/mm. The optimum intensity of recording at this spatial frequency was found to be 1 mW/cm 2 . Individual gratings and focusing elements with high efficiency and FWHM angles of 3 o are experimentally demonstrated.

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Section: Introductionmentioning

confidence: 99%

Using acrylamide-based photopolymers for fabrication of holographic optical elements in solar energy applications

Akbari¹,

Naydenova²,

Martin³

2014

Appl. Opt.

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“…14). If the nanoparticles are redistributed in the dark fringe areas, as it has been observed for MFI, BEA and AEI doped photopolymers [79][80][81], exposure of the grating to the analyte will lead to a decrease of the diffracted beam intensity.…”

Section: Holographic Sensor Based On Transmission Holographic Gratingmentioning

confidence: 86%

“…The first type of sensor can be designed to operate in transmission or reflection mode, while the second requires operation in reflection mode. Examples of sensors based on transmission holograms have been recently reported [79,80]. Transmission holograms recorded in zeolite Beta doped photopolymer have been used for the fabrication of holographic sensors.…”

Section: Holographic Sensors Recorded In Zeolite-doped Photopolymersmentioning

confidence: 99%

“…The optical properties of AEI-doped photopolymer layers combined with the redistribution of the AEI nanoparticles during holographic recording have been exploited for fabrication of an irreversible humidity sensor based on a transmission holographic grating. It has been demonstrated that the diffraction efficiency of the sensor changes permanently after exposure to high humidity [80].…”

Section: Holographic Sensors Recorded In Zeolite-doped Photopolymersmentioning

confidence: 99%

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Progress in zeolite synthesis promotes advanced applications

Zaarour

Dong

Naydenova³

et al. 2014

Microporous and Mesoporous Materials

156

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a b s t r a c tThis article outlines the importance of zeolite synthesis and their unique physicochemical characteristics promoting advanced applications. The main strategies for preparation of zeolites including organic-template assisted, organic-template free and alternative procedures are considered for synthesis of crystallites offering control and fine-tuning of their properties. Besides, rational design of zeolites with pre-determined structure, porosity, size, morphology, and composition are more viable by studying carefully the chemical and physical parameters controlling the zeolite synthesis and understanding the crystallization mechanism. Finally, a particular attention to the preparation of zeolites with nanosized dimensions and their utilization in innovative applications including photovoltaic, medicine and holographic sensors are presented.

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“…1 The introduction of zeolites as nanodopants in the holographic recording medium was previously reported; the formation of zeolite-based photonic structures allows for a change in their optical properties in the presence of the analyte. [10][11][12] This kind of application requires the use of zeolite nanocrystals with uniform diameter, controlled size and high stability in water or ethanol suspensions. A decrease in the particle size from micro-size to nano-size leads to crucial changes of their properties: larger surface areas and lower diffusion rate limitations are among the numerous properties of nanosized zeolites.…”

mentioning

confidence: 99%

Hybrid Sensors Fabricated by Inkjet Printing and Holographic Patterning

Naydenova¹,

Grand

Mikulchyk³

et al. 2015

Chem. Mater.

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Inkjet printing and patterning strategies have been developed for fabrication of hybrid holographic sensors using zeolite nanocrystals on glass-supported photopolymers. The flexibility of the proposed techniques was demonstrated by fabrication and characterization of two types of holographic sensors. The first type, which is a reversible sensor, is based on a transmission hologram recorded in a hydrophobic MFI-type zeolite doped layer with high sensitivity toward alcohols. In this type of sensor the patterning of the zeolite nanocrystals in the volume of the polymer layer is achieved by holographic recording; the pattern periodicity is in the submicrometer range. The second type of sensor is based on a reflection hologram, and it is produced by inkjet printing of zeolite nanocrystals on photopolymer layer before holographic recording. The resulting localized presence of zeolite nanocrystals in the layer is key for the performance of the sensor. Irreversible humidity sensors based on photopolymer layers doped with hydrophilic EMT-type zeolite are fabricated using the second approach and characterized in a controlled humidity environment. We demonstrate that the inkjet printing approach enables fabrication of a variety of patterns with high precision and uniformity, using zeolite nanocrystals (10−50 nm sizes). Limitations and future directions of this fabrication technique are discussed.

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Optical Properties of Photopolymer Layers Doped with Aluminophosphate Nanocrystals

Cited by 39 publications

References 36 publications

Using acrylamide-based photopolymers for fabrication of holographic optical elements in solar energy applications

Using acrylamide-based photopolymers for fabrication of holographic optical elements in solar energy applications

Progress in zeolite synthesis promotes advanced applications

Hybrid Sensors Fabricated by Inkjet Printing and Holographic Patterning

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