Separate and simultaneous investigation of absorption gratings and refractive-index gratings by beam-coupling analysis

Kahmann, F.

doi:10.1364/josaa.10.001562

Cited by 23 publications

(16 citation statements)

References 9 publications

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“…To evaluate

n_{1}, α_{1}, φ

for the mixed gratings, we employ the procedure as described in [59,60]: the oscillatory functions

I_{C 1, C 2} = a_{1, 2} + b_{1, 2} prefixcos (G x + c_{1, 2})

are fitted to the experimentally-measured coupled intensities and then related to the physical quantities.…”

Section: Modeling and Data Evaluationmentioning

confidence: 99%

“…For a sound evaluation, it is necessary to use further information, such as the incoming intensities and the thickness, the latter of which we could take from the rocking-curve measurements in Section 3.4 and Section 4.5. However, ambiguities in the evaluation due to overcoupling, i.e., for

{\bar{n}}_{1} d / λ prefixcos θ_{B} > 1 / 2

, still remain [59]. Different sets of parameters fit the data equally well.…”

Section: Modeling and Data Evaluationmentioning

confidence: 99%

“…Unraveling those contributions can be done by performing 2BC experiments [38,59,60] (see Section 4.3), although diffraction experiments reveal certain signatures of such gratings, as well [67,68,69]. One disadvantage of 2BC experiments is that information is taken only at the Bragg angle.…”

Section: Modeling and Data Evaluationmentioning

confidence: 99%

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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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“…To evaluate

n_{1}, α_{1}, φ

for the mixed gratings, we employ the procedure as described in [59,60]: the oscillatory functions

I_{C 1, C 2} = a_{1, 2} + b_{1, 2} prefixcos (G x + c_{1, 2})

are fitted to the experimentally-measured coupled intensities and then related to the physical quantities.…”

Section: Modeling and Data Evaluationmentioning

confidence: 99%

{\bar{n}}_{1} d / λ prefixcos θ_{B} > 1 / 2

, still remain [59]. Different sets of parameters fit the data equally well.…”

Section: Modeling and Data Evaluationmentioning

confidence: 99%

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

et al. 2016

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“…The results for the direction of the diffracted beam in off-Bragg replay might be important for the implementation of a novel beam coupling technique [29]. The latter is an improved variant of the grating translation technique to determine the amplitudes and possible phases of mixed refractive index/absorption gratings [30][31][32].…”

Section: Discussionmentioning

confidence: 99%

An experimental study on the validity of diffraction theories for off-Bragg replay of volume holographic gratings

2012

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We show that experiments clearly verify the assumptions made by the first-order two-wave coupling theory for one dimensional lossless unslanted planar volume holographic gratings using the beta-value method rather than Kogelnik's K-vector closure method. Apart from the fact that the diffraction process is elastic, a much more striking difference between the theories becomes apparent particularly in the direction of the diffracted beam in off-Bragg replay. We therefore monitored the direction of the diffracted beam as a function of the off-Bragg replay angle in two distinct cases:[a] the diffracted beam lies in the plane of incidence and [b] the sample surface normal, the grating vector and the incoming beam do not form a plane which calls for the vectorial theory and results in conical scattering.

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“…Then, a part of electromagnetic energy incident on the domain during a finite interval of time is absorbed inside the domain. This case is of interest for optical modeling of solar cells [14,15,16,18] and absorbing gratings [30,31,32].…”

Section: Convergence Of the Rcwa Methods In Dissipative Mediamentioning

confidence: 99%

Analysis of the Rigorous Coupled Wave Approach for s-polarized light in gratings

Civiletti

Lakhtakia

Monk

2020

Journal of Computational and Applied Mathematics

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Separate and simultaneous investigation of absorption gratings and refractive-index gratings by beam-coupling analysis

Cited by 23 publications

References 9 publications

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

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

An experimental study on the validity of diffraction theories for off-Bragg replay of volume holographic gratings

Analysis of the Rigorous Coupled Wave Approach for s-polarized light in gratings

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