Low-scattering and highly efficient orientational gratings are obtained, exploiting polarizationholography to modulate the in-plane anchoring axis at both surfaces of a planar nematic cell.Polarization-sensitive azo-dye-doped polyimide films are used as aligning layers. For proper valuesof cell thickness and spatial periodicity of the gratings, the director configuration in the nematic bulkis a perfect replica of the polarization gratings recorded on the aligning layers. High first-orderdiffraction efficiency, up to 98%, is observed in thin grating regime. External ac voltage allows toadjust the efficiency over the whole range for arbitrary cell thickness.

Highly efficient liquid crystal based diffraction grating induced by polarization holograms at the aligning surfaces

PROVENZANO C;PAGLIUSI, Pasquale;CIPPARRONE, Gabriella
2006-01-01

Abstract

Low-scattering and highly efficient orientational gratings are obtained, exploiting polarizationholography to modulate the in-plane anchoring axis at both surfaces of a planar nematic cell.Polarization-sensitive azo-dye-doped polyimide films are used as aligning layers. For proper valuesof cell thickness and spatial periodicity of the gratings, the director configuration in the nematic bulkis a perfect replica of the polarization gratings recorded on the aligning layers. High first-orderdiffraction efficiency, up to 98%, is observed in thin grating regime. External ac voltage allows toadjust the efficiency over the whole range for arbitrary cell thickness.
2006
Polarization Holography; Soft Matter (Liquid Crystals); Diffractive optics
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/150524
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