Electrooptical properties of polarization holographic gratings formed in liquid-crystal composites

Zharkova, G. M.; Петров, А. П.; Streltsov, S. А.; Khachaturyan, V. M.

doi:10.1134/s0018143909070030

Cited by 2 publications

(4 citation statements)

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“…Experimental works describing polarization gratings in PDLC (PSLC), such as Reference [36], note that recording should be held at small incident angles. Besides, intensity of formation waves should be high to cross the threshold of Freedericksz transition [35,38].…”

Section: Numerical Simulations and Discussionmentioning

confidence: 99%

“…Therefore, the change in dielectric constant when the molecule is rotated by a positive angle will be similar to the change when it is rotated to a negative angle, and thus, the period of Δsans-serifε^lcfalse(boldnormalr,tfalse) change doubles. Additionally, doubled period of polarization gratings in PDLC is shown experimentally in [36] and another experimental works.…”

Section: Numerical Simulations and Discussionmentioning

confidence: 99%

“…Figure 2a shows a vector diagram for recording of phase diffraction gratings. Figure 2b contains an illustration of the photo-induced Freedericksz transition—the effect of the reorientation of LC molecules under the action of an electric field of an incident light wave [35,36].…”

Section: Theoretical Modelmentioning

confidence: 99%

“…In our previous works [32,33,34] we have shown that due to the influence of the photo-induced Freedericksz transition [35,36], it is possible to form the polarization diffraction gratings (PDGs) in LC-PPM by the polarization holography methods.…”

Section: Introductionmentioning

confidence: 99%

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Holographic Formation of Non-uniform Diffraction Structures by Arbitrary Polarized Recording Beams in Liquid Crystal-photopolymer Compositions

Semkin

Шарангович

2019

Polymers

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In this work, the theoretical model of non-uniform diffraction structures’ holographic formation in liquid crystal-photopolymer (LC-PPM) composite materials with a dye-sensitizer is developed. The model takes into account the arbitrary character of amplitude and phase spatial distributions of recording light field, its arbitrary polarization state and also a non-linearity of the recording process. Two the most common types of liquid crystal-photopolymer composite are investigated: Holographic polymer-dispersed liquid crystals (H-PDLC) and polymer-stabilized liquid crystals (PSLC). Numerical simulations for the most common cases of holographic formation schemes are made. It is shown that due to the photo-induced Freedericksz transition, in the case of arbitrary polarization states of recording light beams, the non-uniform polarization diffraction grating (PDG) is formed in LC-PPM. Numerical simulations’ results show that PDG’s contribution to the change of the dielectric tensor of the media is comparable with the contribution of the photopolymerization-diffusion process.

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Section: Numerical Simulations and Discussionmentioning

confidence: 99%