Nano-Phase Polymer Dispersed Liquid Crystals

Blacker, Richard; Lewis, Keith L.; Mason, Ian; Sage, Ian; Webb, C. J.

doi:10.1080/10587259908025940

Cited by 7 publications

(3 citation statements)

References 5 publications

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“…Of course, other possible polarizationinsensitive devices can be found, for instance, devices based on the opposite extreme of very small-sized ͑subwavelength͒ LC structures, where the above limitation would not apply. 31,32 The domain walls that occur between the up and the down regions have not been considered in this paper. For small pitches the presence of domain walls introduces a dependence on the orientation of the input polarization and also reduces the diffraction efficiency.…”

Section: Discussionmentioning

confidence: 99%

Calculation of the efficiency of polarization-insensitive surface-stabilized ferroelectric liquid-crystal diffraction gratings

Brown¹,

Kriezis²

2003

Appl. Opt.

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A rigorous analysis is presented of the diffraction efficiency of a polarization-insensitive surface-stabilized ferroelectric liquid-crystal (SSFLC) phase grating, taking full account of the internal structure of the ferroelectric liquid-crystal layer. When no field is applied, the twisted director profile in the relaxed state gives an optimum diffraction efficiency for a device thickness between the half-wave-plate and the full-wave-plate conditions. The influence of the magnitude of the spontaneous polarization and applied ac fields are investigated, and it is shown that the diffraction efficiency of a binary SSFLC phase grating can be strongly enhanced with the technique of ac stabilization.

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Section: Discussionmentioning

confidence: 99%

Calculation of the efficiency of polarization-insensitive surface-stabilized ferroelectric liquid-crystal diffraction gratings

Brown¹,

Kriezis²

2003

Appl. Opt.

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“…Sansome et al [7] reported enhancements of a factor of 3 for the E7/NOA60 system when the temperature was increased from ambient to 55°C. This fell sharply at the nematic to isotropic phase transition temperature for E7 at 59°C.…”

Section: Cc4310mentioning

confidence: 97%

“…On application of electric field, the individual liquid crystal molecules align, with a resulting reduction in the effective index of the medium. In resonant cavity devices incorporating the material, the extent of fringe shift as a function of applied voltage is a direct result of the change in refractive index induced in the nanocomposite [7,8].…”

Section: Introductionmentioning

confidence: 99%

Frequency Agile Optical Filters using Nanoscopic Polymer Dispersed Liquid Crystals

et al. 2001

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The ability to realise frequency agile filters has always been a major goal of materials and device scientists. Polymer dispersed liquid crystal materials (PDLCs), in which the droplets are deliberately produced with dimensions smaller than the Rayleigh limit for optical scatter, provide a means of realising this goal. At visible wavelengths the material has the appearance of a phase-homogeneous medium both with and without applied electric field. Refractive indices are an average of those of the liquid crystal and those of its host and can be described on the basis of effective medium approximations using orientationally averaged values for the randomly aligned LC material for the ambient state. On application of electric field, the individual liquid crystal molecules align with a resulting reduction in the effective index of the medium. Extensive studies of the variation of process parameters and their effect on the morphology of the composite have enabled field induced changes in refractive index in excess of 0.05 to be achieved without recourse to the use of polarisers and with little or no hysteresis effects. At wavelengths associated with WDM devices for telecommunication applications, the degree of scatter loss is negligible. Design trade-offs have been assessed for candidate tunable WDM filters based on resonant cavity devices.

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Liquid Crystal Lens

Ren¹,

Wu²

2012

Introduction to Adaptive Lenses

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Nano-Phase Polymer Dispersed Liquid Crystals

Cited by 7 publications

References 5 publications

Calculation of the efficiency of polarization-insensitive surface-stabilized ferroelectric liquid-crystal diffraction gratings

Calculation of the efficiency of polarization-insensitive surface-stabilized ferroelectric liquid-crystal diffraction gratings

Frequency Agile Optical Filters using Nanoscopic Polymer Dispersed Liquid Crystals

Liquid Crystal Lens

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