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Effects of anchoring strength on diffraction properties of liquid crystal phase gratings formed on photoalignment polymer films
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10.1063/1.2749485
/content/aip/journal/jap/101/12/10.1063/1.2749485
http://aip.metastore.ingenta.com/content/aip/journal/jap/101/12/10.1063/1.2749485
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Chemical structures of (a) photocross-linkable polymer liquid crystal (PCLC), (b) poly(vinyl cinnnamate) (PVCi), and low-molar-mass liquid crystal (5CB).

Image of FIG. 2.
FIG. 2.

(Color online) Schematic illustration showing the liquid crystal grating cells created by pair of planar-periodic modulated substrate and uniform planar substrate.

Image of FIG. 3.
FIG. 3.

(Color online) (a) Schematics of the top view of the periodic director orientation showing the planar and competing right- and left-handed twisted configurations with a disclination line. Polarizing optical microscopy images for LC gratings using PCLC photoalignment layers on varying the grating constant: (a) , (b) , (c) , and (d) .

Image of FIG. 4.
FIG. 4.

The spatial distribution of calculated using the elastic continuum theory. The horizontal lines represent the projections of the director. The edge with the vertical line indicates the head of the director. The grating constant is set to be (a) , (b) , (c) , and (d) .

Image of FIG. 5.
FIG. 5.

The diffraction efficiencies of LC gratings using PCLC films vs polarization azimuth of linearly polarized probe beam on varying the LC grating constant. Open squares and circles represent the experimental data for -ordered and -ordered diffraction beams, respectively. The dotted curves are obtained from the elastic continuum theory, Jones calculus, and diffraction theory. The grating constant is set to be (a) , (b) , (c) , and (d) .

Image of FIG. 6.
FIG. 6.

(a) Observed Neel wall in the homogeneously aligned LC cell fabricated by PVCi substrates and (b) anchoring strength of PVCi films vs exposure energy of LPUV light.

Image of FIG. 7.
FIG. 7.

The diffraction efficiencies of LC gratings using PVCi films vs polarization azimuth of linearly polarized probe beam on varying the LC grating constant. The exposure energy is . Open squares and circles represent the experimental data for -ordered and -ordered diffraction beams, respectively. The dotted curves are obtained from the elastic continuum theory, Jones calculus, and diffraction theory. The grating constant is set to be (a) , (b) , and (c) .

Image of FIG. 8.
FIG. 8.

Diffraction efficiencies of LC gratings vs anchoring strength of photoalignment layers. Theoretical calculated values obtained under the strong anchoring conditions are shown as three allows.

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/content/aip/journal/jap/101/12/10.1063/1.2749485
2007-06-26
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Effects of anchoring strength on diffraction properties of liquid crystal phase gratings formed on photoalignment polymer films
http://aip.metastore.ingenta.com/content/aip/journal/jap/101/12/10.1063/1.2749485
10.1063/1.2749485
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