Beam deflector using double-refraction in ferroelectric liquid crystal waveguides

Gros, Esther; Dupont, Laurent

doi:10.1080/00150190008230069

Cited by 5 publications

(4 citation statements)

References 11 publications

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“…These materials exhibit unique properties that enable them to be used for a variety of applications, including displays [1][2][3], telecommunication switching [4,5], and optical storage [6,7]. In particular, due to the increasing market for high definition displays, liquid crystal displays (LCDs) have become a prominent area of research in the LC field, as they hold the potential for enabling displays with higher resolution, lighter weight, and reduced thickness.…”

Section: Introductionmentioning

confidence: 99%

Electro-optic properties of thiol-ene polymer stabilized ferroelectric liquid crystals

et al. 2003

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Electro-optic properties of polymer stabilized ferroelectric liquid crystal (PSFLC) systems are examined as a function of varying concentrations of either a linear or crosslinked thiol-ene polymer. The thiol-ene method of polymer stabilization is a drastic change from previous studies designed to avert the problem of polymer phase separation. FLC rise time and tilt angle measurements were used to determine the effects of the polymer network on the optical properties of the system. The addition of monomer impurities to both systems demonstrated a reduction in tilt angle, which translated into decreased switching speeds in both systems prior to polymerization. The crosslinked thiol-ene system showed increased switching times due to the creation of polymer in the interlayer spacing of the FLC, but exhibited minimal increase in the rotational viscosity of the system. In addition, the crosslinked polymer systems resulted in an increase in the liquid crystalline order, which produced an increase in the contrast ratio of the system. The linear polymer system showed drastically different results as compared with the crosslinked system. The rise time and tilt angle measurements decreased upon polymerization of the linear thiol-ene and the rotational viscosity and contrast ratio values also decreased. We suggest that the linear thiol-ene polymer phase separation from the interlayer spacing leads to a microscopic misalignment of the FLC molecules, causing a decrease in the optical properties of the LC.

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Section: Introductionmentioning

confidence: 99%

Electro-optic properties of thiol-ene polymer stabilized ferroelectric liquid crystals

et al. 2003

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“…However, despite the signi cant bene ts of FLCs, a number of di Y culties have kept these materials Ferroelectric liquid crystals (FLCs) exhibit unique from reaching large scale commercial applications, properties enabling their use in a variety of applications, including defects, alignment, and stability issues [10][11][12]. including displays [1][2][3], telecommunication switching One of the more signi cant drawbacks of FLCs is [4,5], and optical storage [6,7]. In particular, due to their susceptibility to mechanical shock [11].…”

Section: Introductionmentioning

confidence: 99%

Formation of a host nanostructure for ferroelectric liquid crystals using thiol-ene polymers

Cramer¹,

Beckel²,

Harant³

et al. 2002

Liquid Crystals

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Liquid crystal displays are a subject of intense research interest because of their application to high de nition display devices. Recently, polymer stabilized ferroelectric liquid crystals (PSFLCs) have been investigated due to the enhanced electro-optic properties of FLCs. We have utilized thiol-ene photopolymerizations to form a PSFLC system. Thiol-ene photopolymerizations are radical reactions, which proceed via a step growth reaction mechanism. During the polymerization, the polymer network structure is trapped into place due to the rapid transition from low molecular mass monomers and oligomers to high molecular mass polymer. This aspect is evidenced by phase transition data for the FLC, which indicates that the monomer and polymer are not phase separated from the FLC. Infrared dichroism shows that both monomer and polymer are ordered in parallel with the smectic layers of the FLC. Small angle X-ray scattering (SAXS) data show that both monomer and polymer are swelling the smectic layers. Thus, a polymer nanostructure is produced that serves as an ordered, stabilizing host for the FLC.

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“…When longitudinal anisotropy is incorporated there is an asymmetry with respect to the z-direction. This leads to off-axis energy transfer of the extraordinary polarization component [14][15][16]. We have developed a mode solver capable of handling fully anisotropic problems.…”

Section: B Simulationsmentioning

confidence: 99%

Tuning silicon-on-insulator ring resonators with in-plane switching liquid crystals

et al. 2010

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We show that the resonance wavelength of Silicon-On-Insulator ring resonators can be tuned when a top cladding of liquid crystal is present. In-plane strip electrodes are used to generate an electric field that reorients the liquid crystal director in the plane parallel to the chip surface. This causes the resonance wavelength to shift towards longer wavelengths. The magnitude of this shift is about 1 nm, which is twice as large as previously reported shifts. The experimental results are verified extensively with our simulation tools, where a calculation of the director orientation is combined with a fully anisotropic mode solver. From this we get a clear view of the mechanism behind the tuning.

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Beam deflector using double-refraction in ferroelectric liquid crystal waveguides

Cited by 5 publications

References 11 publications

Electro-optic properties of thiol-ene polymer stabilized ferroelectric liquid crystals

Electro-optic properties of thiol-ene polymer stabilized ferroelectric liquid crystals

Formation of a host nanostructure for ferroelectric liquid crystals using thiol-ene polymers

Tuning silicon-on-insulator ring resonators with in-plane switching liquid crystals

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