Formation of dynamic holograms based on spatial modulation of molecular motions of ferroelectric liquid crystals

Sasaki, Takeo; Mochizuki, Oki; Nakazawa, Yukihito; Fukunaga, Godai; Nakamura, Tetsuya; Noborio, Kazunori

doi:10.1063/1.1785283

Cited by 11 publications

(16 citation statements)

References 19 publications

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“…[7][8][9][10][11][12][13] FLCs exhibit a chiral smectic C phase (SmC*) that possesses a helical structure. [14] When the FLC is sandwiched between glass plates to form a film of few micrometers thick, the helical structure uncoils and a surface-stabilized state (SS-state) is formed in which spontaneous polarization (Ps) appears. The direction of the Ps is correlated with the direction of the FLC molecules.…”

Section: Introductionmentioning

confidence: 99%

Formation of Dynamic Hologram in Photorefractive Ferroelectric Liquid Crystals

Sasaki

Ikegami

Naka

2012

J. Photopol. Sci. Technol.

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Section: Introductionmentioning

confidence: 99%

Formation of Dynamic Hologram in Photorefractive Ferroelectric Liquid Crystals

Sasaki

Ikegami

Naka

2012

J. Photopol. Sci. Technol.

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“…No image retention was observed, which means that the hologram image (refractive index grating) formed in the FLC was rewritten sufficiently rapidly to project the reproduction of a smooth holographic movie. The formation of dynamic holograms based on the spatial modulation of the molecular motion of ferroelectric liquid crystals (FLCs) was demonstrated [16,17]. The switching movement of an FLC molecule is essentially a rotational motion along a conical surface.…”

Section: Formation Of Dynamic Holograms In Flc Mixturesmentioning

confidence: 99%

Photorefractive Effect in Ferroelectric Liquid Crystals

Sasaki¹

2012

Advances in Ferroelectrics

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“…[36][37][38][39][40][41][42] FLCs are classified as chiral smectic C (SmC Ã ) liquid crystals that form a layered structure. [58][59][60] In the SmC Ã phase, the long axis of each FLC molecule tilts from the layer normal.…”

Section: Photorefractive Effect Of Ferroelectric Lcsmentioning

confidence: 99%

“…42 The switching movement of an FLC molecule is essentially a rotational motion along a conic surface. 59 When an alternating triangular-waveform voltage is applied, the FLC molecules uniformly perform a consecutive rotational switching motion along a conic surface (Figure 25a).…”

Section: Formation Of Dynamic Holograms Based On Spatial Modulation Omentioning

confidence: 99%

“…2 Several reviews on the development of photorefractive materials have been published. [3][4][5][6][7] The photorefractive effect has been reported in several organic materials since 1990, such as glassy polymers, [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] low-molecular-weight nematic liquid crystals, [24][25][26][27][28] liquid crystalline polymers, [29][30][31][32][33][34][35] ferroelectric liquid crystals, [36][37][38][39][40][41][42] polymer/liquid crystal composites [43][44][45][46][47][48][49][50]…”

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Photorefractive Effect of Liquid Crystalline Materials

Sasaki

2005

Polym J

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ABSTRACT:This paper reviews our recent work on the photorefractive effect in liquid crystalline materials. The photorefractive effect is defined as the optical modulation of the refractive index of a medium as a result of various processes. The interference of two laser beams in a photorefractive material establishes a refractive index grating. This phenomenon enables the creation of different types of photonic applications. Recently, the development of organic photorefractive materials has been attracting great interest. Liquid crystalline materials are a strong candidate for practical photorefractive materials and application. In this paper, the photorefractivity of liquid crystalline polymers and ferroelectric liquid crystals is described. [DOI 10.1295 The photorefractive effect is a phenomenon wherein a change in the refractive index of a material is induced by the absorption of light. The change in refractive index through the photorefractive effect occurs only within the interference fringes of incident laser beams. When laser beams interfere in a photorefractive material, charge separation occurs between the light and the dark positions of the interference fringes. A space-charge field, an internal electric field, develops at the areas between the light and the dark positions. The refractive index of the corresponding areas is changed through an electro-optic effect. Thus, a refractive index grating is formed at the interference fringes.Dynamic volume-holograms are easily formed through the photorefractive effect, and this has direct applicability in photonics, including optical image processing, parallel optical logic, fringe recognition, and phase conjugation. The photorefractive effect was first observed in the inorganic crystal lithium niobate in 1967.1 It was also subsequently observed in an organic material in 1990.2 Several reviews on the development of photorefractive materials have been published. [3][4][5][6][7] The photorefractive effect has been reported in several organic materials since 1990, such as glassy polymers, [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] low-molecular-weight nematic liquid crystals, 24-28 liquid crystalline polymers, [29][30][31][32][33][34][35] ferroelectric liquid crystals, 36-42 polymer/liquid crystal composites 43-55 and amorphous compounds, 56,57 and extremely high photorefractivity values have been achieved in organic polymeric materials. The high photorefractivity in polymeric materials arises from changes in the orientations of the chromophores induced by the internal electric field, termed orientational enhancement. 4,15,17 The photorefractive efficiency of organic materials is several times that of inorganic photorefractive crystals. In addition, organic polymers can easily be processed into films and fibers. This is a significant advantage for applications in photonics.

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Formation of dynamic holograms based on spatial modulation of molecular motions of ferroelectric liquid crystals

Cited by 11 publications

References 19 publications

Formation of Dynamic Hologram in Photorefractive Ferroelectric Liquid Crystals

Formation of Dynamic Hologram in Photorefractive Ferroelectric Liquid Crystals

Photorefractive Effect in Ferroelectric Liquid Crystals

Photorefractive Effect of Liquid Crystalline Materials

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