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Broadband Polarization Gratings for Efficient Liquid Crystal Display, Beam Steering, Spectropolarimetry, and Fresnel Zone Plate.

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Figure 2.2: Poincar´e sphere for graphical description of light polarization. An arbitrarypolarization state can be represented as a point within the sphere and the coordinationsare determined by the Stokes parameters.
Figure 2.4: Light propagation in an optically active medium: (a) a rotation of the planeof the polarization as light travels in the medium; (b) the normalized Stokes parameters ofthe output beam as a function of the optical activity (∆ncd/λ).
Figure 2.8: Properties of nematic liquid crystal (LC) materials: (a) a LC molecule with andielectric anisotropy; (b) a nematic director n; (c) three basic elastic deformations in LCs(splay, twist, and bend).
Figure 2.11: Photoalignment of LCs by the photoisomerization of azo-containing polymers:(a) homogeneous to homeotropic transition by a ‘command surface’ treated as aligned azo-dye monolayer (from Ref
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Outline

Light propagation in periodic media Photoalignment of liquid crystal materials Liquid crystal applications in displays and photonics Numerical analysis of polarization gratings using the FDTD method Electrically switchable achromatic liquid crystal polarization gratings Fabrication of small-period PGs using high ∆ n l materials High-Throughput, Continuous, Beam Steering Using Rotating Polarization Fresnel lenses and zone plates as a thin lens Polarization-type Fresnel zone plates based on a continuous, concentric po- Summary and Conclusions

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