Merged vector gratings recorded in a photocrosslinkable polymer liquid crystal film for polarimetry

Sasaki, Tomoyuki; Wada, Takuro; Noda, Kohei; Kawatsuki, Nobuhiro; Ono, Hiroshi

doi:10.1063/1.4861742

Cited by 9 publications

(2 citation statements)

References 23 publications

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“…The laser beam was divided into two beams with an intensity of 25 mW=cm 2 , and these two beams were crossed in the PLCP film. 23) The exposure time was 8 s. The incident angles of the two beams were adjusted to form a periodic pattern with a pitch of 60 µm. Using quarter-wave plates, we set the polarization states of the two beams for right-and left-circular polarization.…”

Section: Experimental Methodsmentioning

confidence: 99%

Alignment structures and diffraction properties of chiral nematic liquid crystal cells with periodically patterned photoalignment films

Sasaki

Shimura

Kawai

et al. 2015

Jpn. J. Appl. Phys.

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Liquid crystal (LC) cells with periodic alignment distributions were fabricated using chiral nematic LCs (N*LCs), which were prepared using mixtures of a nematic LC and a chiral dopant, along with photoreactive liquid crystalline polymer (PLCP) films. Periodic structures were formed by polarization holographic recording in the PLCP films. The director distribution in each cell depended on the ratio of chiral dopant present, i.e., the inherent helical pitch of the N*LCs. These periodic alignment structures with line defects in the LC grating cells were well explained on the basis of the elastic continuum theory of the N*LCs and the photoalignment effect of the PLCP films. The diffraction properties of the grating LC cells were also investigated using a polarized visible laser. The observed intensity and polarization states of the diffracted beams were consistent with theoretical ones calculated using the director distribution models. Our results clarify that the diffraction properties of the grating LC cells can be controlled by the helical pitch of the N*LCs.

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Section: Experimental Methodsmentioning

confidence: 99%

Alignment structures and diffraction properties of chiral nematic liquid crystal cells with periodically patterned photoalignment films

Sasaki

Shimura

Kawai

et al. 2015

Jpn. J. Appl. Phys.

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“…Birefringent materials have become a focal research point, as optical waveguides with unique functions and properties can be prepared by using such materials . Polymer optical materials have a wide range of applications as they possess excellent performance and tunable refractive indices, while being cheap and easy to process.…”

Section: Introductionmentioning

confidence: 99%

Theoretical study on adsorption properties of methyl methacrylate and its molecular chain within metal‐organic frameworks

Lü

et al. 2017

J of Physical Organic Chem

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Utilizing metal‐organic frameworks (MOFs) as a “polymerization container” is a very effective method to prepare oriented and therefore birefringent polymer materials. In particular, the adsorption of polymer monomers and molecular chains within MOFs has a profound impact on the orientation of polymer chains. In this work, a theoretical study on the adsorption properties of methyl methacrylate (MMA) and its molecular chain within MOFs has been conducted by employing a combination of molecular dynamics, density functional theory, and Monte Carlo method, where 2 MOFs, [Zn2(1,4‐benzenedicarboxylate)2triethylenediamine]n and [Zn2(4,4′‐biphenyldicarboxylate)2triethylenediamine]n, were chosen. The corresponding number and degree of orientation of adsorbed molecules in these 2 MOFs were obtained from the simulations. The calculation results revealed 3 factors that affect the adsorption and orientation of MMA monomers in MOF pore channels. First, as the walls of the MOF pores are polar surfaces and consist of metal ions and organic ligands, the electrostatic interaction between the MOF channels and polar MMA molecules promotes the adsorption and orientation of the MMA monomers within the pore channel. Second, the electrostatic interactions between monomers can reduce the intermolecular gaps, which similarly assist in their orientation. Last, the relative sizes of the MOF pores and the monomers are also relevant. When the sizes of the MOF channels and monomers are similar, the molecular chains show a higher degree of orientation. The results and the findings of this work could provide predictive methods for selecting polymeric monomers or MOFs that may be ideal for the control of polymer chain orientation.

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Liquid Crystal Diffraction Gratings Using Photocrosslinkable Liquid Crystalline Polymer Films as Alignment Layers

Sasaki

Noda

Ono

et al. 2015

Liquid Crystalline Polymers

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Merged vector gratings recorded in a photocrosslinkable polymer liquid crystal film for polarimetry

Cited by 9 publications

References 23 publications

Alignment structures and diffraction properties of chiral nematic liquid crystal cells with periodically patterned photoalignment films

Alignment structures and diffraction properties of chiral nematic liquid crystal cells with periodically patterned photoalignment films

Theoretical study on adsorption properties of methyl methacrylate and its molecular chain within metal‐organic frameworks

Liquid Crystal Diffraction Gratings Using Photocrosslinkable Liquid Crystalline Polymer Films as Alignment Layers

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