Observation of self-starting phase-conjugate oscillation in a planar nematic liquid-crystal cell

Chen, Shu‐Hsia; Shen, Yuhren

doi:10.1063/1.121050

Cited by 11 publications

(3 citation statements)

References 4 publications

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“…Photorefraction in liquid crystals has recently attracted significant attention since it is characterized with strong optical nonlinearities at low light intensities and voltage [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Currently, liquid crystalline materials are considered a leading candidate for those applications that do not require long storage times.…”

Section: Introductionmentioning

confidence: 99%

“…Ã 10.1080=15421400490501987 volume and in the LC orienting layer. In case of volume-mediated photorefraction, an incident optical intensity grating generates photo-charges in LC bulk, which migrate and diffuse within the LC and set up various dc space charge fields [1][2][3][4][5][6][7][8][9]. These space charge fields create a torque on the liquid crystal director, forcing director reorientation and hence large refractive index changes.…”

Section: Introductionmentioning

confidence: 99%

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Surface-Mediated Beam Coupling in Nominally Pure Nematic Liquid Crystal

Korneichuk

Reznikov

Tereshchenko

et al. 2004

Molecular Crystals and Liquid Crystals

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Victor ReshetnyakPhysics Faculty Kiev Taras Shevchenko Shevchenko, Pr. Glushkova, 6, Kyiv, 03680, UkraineWe have carried out experiments that indicate a surface-charge-mediated photorefractive effect in nominally pure liquid crystal homeotropically aligned on ITO-electrodes. We suggest that interfering beams modulate distribution of the charges in a layer of LC molecules adsorbed by the ITO-electrodes surfaces. It results in a tangential component of dc-field applied to the cell which re-arranges liquid crystal molecules in the adsorbed layer. This re-arrangement causes an easy axis modulation and the grating recording. A bulk-mediated mechanism related to an instability induced by the dc-field may give a contribution to the grating formation in specific range of the recording parameters.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Surface-Mediated Beam Coupling in Nominally Pure Nematic Liquid Crystal

Korneichuk

Reznikov

Tereshchenko

et al. 2004

Molecular Crystals and Liquid Crystals

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show abstract

“…We choose the coordinates system with the z axis perpendicular to the cell walls, the x-y plane coincident with the input cell wall and the x direction coincident with the easy axis of the liquid crystal directors. From the continuum theory and by following the derivation of our previous papers [15][16][17], the free-energy density f consisted of the Frank elastic free-energy density, the optical energy density, and the electric energy density is given by:…”

Section: Theorymentioning

confidence: 99%

Crucial effects of the anisotropy on optical field induced pattern formation in nematic liquid crystal films

Hsu¹,

Chen²,

Lai³

2004

Opt. Express

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We present here the crucial effects of material anisotropy on optical field induced pattern formation in the one-feedback-mirror arrangement which utilizes the nematic liquid crystal film as the nonlinear medium. By using the quasi-static electric-field-biased planar-aligned homogeneous nematic liquid crystal (NLC) films, we observe both the hexagon and the roll patterns which can be switched optically due to the intrinsic anisotropic distribution of the threshold intensity. The anisotropy comes from the anisotropic nonlinear response of the NLC film and is the crucial factor for such a one-feedback-mirror system to form both the roll and hexagon patterns. The observed phenomena can be explained from the linear stability analysis of the governing diffusion-like equation. The experimental results indicate that the stable roll patterns are formed at low input light power and the stable hexagon patterns formed at high input power.

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Observation of self-starting phase-conjugate oscillation in a planar nematic liquid-crystal cell

Abstract: We report the observation of self-starting optical phase-conjugate oscillation in a nematic liquid-crystal cell. A theoretical model based on the continuum theory of liquid crystals and optical theory of degenerate four-wave mixing is developed to explain the observed phenomena.

Cited by 11 publications

References 4 publications

Surface-Mediated Beam Coupling in Nominally Pure Nematic Liquid Crystal

Surface-Mediated Beam Coupling in Nominally Pure Nematic Liquid Crystal

Crucial effects of the anisotropy on optical field induced pattern formation in nematic liquid crystal films

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