Far-off-Bragg reconstruction of volume holographic gratings: A comparison of experiment and theories

Prijatelj, Matej; Klepp, Jürgen; Tomita, Yasuo; Fally, Martin

doi:10.1103/physreva.87.063810

Cited by 16 publications

(15 citation statements)

References 36 publications

(58 reference statements)

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“…A number of related theories have been reported to take account for various simple cases in diffraction [ 129 ]. These include: (1) a large number of high-order diffracted waves [ 130 ] and (2) only two waves (transmitted and first-order diffracted waves) to propagate [ 131 – 136 ] as sole waves in periodic media, respectively. In its rigorous counterpart model, coined as the rigorous coupled-wave analysis (RCWA)[ 137 , 138 ], an infinite set of second-order differential equations are solved, subject to the boundary conditions at .…”

Section: Holographic Grating Formation and Grating Characterizationmentioning

confidence: 99%

Photopolymerizable nanocomposite photonic materials and their holographic applications in light and neutron optics

Tomita

Hata

Momose

et al. 2016

Journal of Modern Optics

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We present an overview of recent investigations of photopolymerizable nanocomposite photonic materials in which, thanks to their high degree of material selectivity, recorded volume gratings possess high refractive index modulation amplitude and high mechanical/thermal stability at the same time, providing versatile applications in light and neutron optics. We discuss the mechanism of grating formation in holographically exposed nanocomposite materials, based on a model of the photopolymerization-driven mutual diffusion of monomer and nanoparticles. Experimental inspection of the recorded grating’s morphology by various physicochemical and optical methods is described. We then outline the holographic recording properties of volume gratings recorded in photopolymerizable nanocomposite materials consisting of inorganic/organic nanoparticles and monomers having various photopolymerization mechanisms. Finally, we show two examples of our holographic applications, holographic digital data storage and slow-neutron beam control.

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Section: Holographic Grating Formation and Grating Characterizationmentioning

confidence: 99%

Photopolymerizable nanocomposite photonic materials and their holographic applications in light and neutron optics

Tomita

Hata

Momose

et al. 2016

Journal of Modern Optics

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“…There are plenty of theories to describe diffraction under two-wave coupling conditions without attenuation along the depth (e.g., [63,64,65]), maybe the most famous and extensively quoted one by Kogelnik [66]. For in-phase mixed gratings, the contributions of both components for the diffraction efficiency

η_{1}

simply add up [66], i.e.,

η_{1} = ([] {prefixsin}^{2} (\frac{n_{1} π d}{λ prefixcos θ_{B}}) + {prefixsinh}^{2} (\frac{α_{1} d}{2 prefixcos θ_{B}})) e^{- \frac{2 α_{0} d}{prefixcos θ_{B}}}

when the Bragg condition is fulfilled.…”

Section: Modeling and Data Evaluationmentioning

confidence: 99%

A Comprehensive Study of Photorefractive Properties in Poly(ethylene glycol) Dimethacrylate— Ionic Liquid Composites

et al. 2016

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A detailed investigation of the recording, as well as the readout of transmission gratings in composites of poly(ethylene glycol) dimethacrylate (PEGDMA) and ionic liquids is presented. Gratings with a period of about 5.8 micrometers were recorded using a two-wave mixing technique with a coherent laser beam of a 355-nm wavelength. A series of samples with grating thicknesses d0=10…150 micrometers, each for two different exposure times, was prepared. The recording kinetics, as well as the post-exposure properties of the gratings were monitored by diffracting a low intensity probe beam at a wavelength of 633 nm for Bragg incidence. To obtain a complete characterization, two-beam coupling experiments were conducted to clarify the type and the strength of the recorded gratings. Finally, the diffraction efficiency was measured as a function of the readout angle at different post-exposure times. We found that, depending on the parameters, different grating types (pure phase and/or mixed) are generated, and at elevated thicknesses, strong light-induced scattering develops. The measured angular dependence of the diffraction efficiency can be fitted using a five-wave coupling theory assuming an attenuation of the gratings along the thickness. For grating thicknesses larger than 85 microns, light-induced scattering becomes increasingly important. The latter is an obstacle for recording thicker holograms, as it destroys the recording interference pattern with increasing sample depth. The obtained results are valuable in particular when considering PEGDMA-ionic liquid composites in the synthesis of advanced polymer composites for applications, such as biomaterials, conductive polymers and holographic storage materials.

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“…This algorithm was improved so that the higher orders of diffraction that appear in nonvolume holograms were considered as well. The number of diffraction orders that emerge at each point inside the medium at the reconstruction step and their direction of propagation are determined with the help of the so-called beta-value closure [26,[34][35][36] ( )…”

Section: Algorithm For Simulations Of Cylindrical Holographic Lenses mentioning

confidence: 99%

Full modeling and experimental validation of cylindrical holographic lenses recorded in Bayfol HX photopolymer and partly operating in the transition regime for solar concentration

et al. 2018

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Concentrating photovoltaics for building integration can be successfully carried out with Holographic Optical Elements (HOEs) because of their behavior analogous to refractive optical elements and their tuning ability to the spectral range that the photovoltaic (PV) cell is sensitive to. That way, concentration of spectral ranges that would cause overheating of the cell is avoided. Volume HOEs are usually chosen because they provide high efficiencies. However, their chromatic selectivity is also very high, and only a small part of the desired spectral range reaches the PV cell. A novel approach is theoretically and experimentally explored to overcome this problem: the use of HOEs operating in the transition regime, which yield lower chromatic selectivity while keeping rather high efficiencies. A model that considers the recording material's response, by determining the index modulation reached for each spatial frequency and exposure dosage, has been developed. It has been validated with experimental measurements of three cylindrical holographic lenses with different spatial frequency ranges recorded in Bayfol HX photopolymer. Simulations of systems comprising two lenses and a mono-c Si PV cell are carried out with the standard AM 1.5D solar spectrum. Promising results are obtained when using the system with lower spatial frequencies lenses: a total current intensity equal to 3.72 times the one that would be reached without the concentrator.

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Far-off-Bragg reconstruction of volume holographic gratings: A comparison of experiment and theories

Cited by 16 publications

References 36 publications

Photopolymerizable nanocomposite photonic materials and their holographic applications in light and neutron optics

Photopolymerizable nanocomposite photonic materials and their holographic applications in light and neutron optics

A Comprehensive Study of Photorefractive Properties in Poly(ethylene glycol) Dimethacrylate— Ionic Liquid Composites

Full modeling and experimental validation of cylindrical holographic lenses recorded in Bayfol HX photopolymer and partly operating in the transition regime for solar concentration

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