Polarization properties and diffraction efficiencies of binary anisotropic gratings: general study and experiments on ferroelectric liquid crystals

We demonstrate a polarization-insensitive grating device based on a liquid crystal (LC) doped with azo-dyes in polymer networks. The polarization-insensitive diffraction is obtained by periodically modulating the optic axis of a homogeneously aligned nematic LC layer. The polymer networks formed in the doped LC medium play a critical role in achieving the optic axis modulation of the LC by a single pump irradiation. The optically induced effect in the dye-doped LC system is permanent, polarization-insensitive, and electrically controllable.

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“…With the Fraunhofer diffraction formalism for a binary anisotropic grating [10], the optical field of the first-order diffraction is given by…”

Section: Resultsmentioning

confidence: 99%

Design of a Polarization-Insensitive Diffraction Grating Device Based on a Dye-Doped Liquid Crystal in Polymer Networks

Jang

Lee

2005

Molecular Crystals and Liquid Crystals

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“…One simple example is a binary polarization grating, where two strips of different polarization devices constitute the basic period of the grating. Some initial efforts concentrated in the study and characterization of the properties of these gratings [1], but was Gori's proposal [2] of a PDG constructed from a series of rotating polarizers with continuous polarization gratings, that led to the identification of its potential use as elements for polarimetric analysis. After that, different PDG designs have been proposed [3,4].…”

Section: Introductionmentioning

confidence: 99%

Programmable liquid crystal waveplate polarization gratings as elements for polarimetric and interference applications

Moreno

Davis

2010

EPJ Web of Conferences

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We review the use of a parallel aligned nematic liquid crystal spatial light modulator as a very useful and flexible device for polarimetric and interferometric applications. The device acts as a programmable pixelated waveplate, and the encoding of a linear grating permits its use as a polarization beam splitter. When a grating with a reduced period is encoded, the diffracted beams are spatially separated and the device can be used for polarimetric analysis. On the contrary when a large period grating is displayed, the beams are not spatially separated, and they are useful to realize a common path interferometric system with polarization sensitivity. The flexibility offered by the programmability of the display allows non-conventional uses, including the analysis of light beams with structured spatial polarizations.

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“…Moreover, the optically generated phase modulation can be precisely tuned by the application of a bias voltage. Within the Fraunhofer diffraction formalism for a binary phase grating [6], the diffraction efficiency of the first-order is given by…”

Section: Introductionmentioning

confidence: 99%

Electrically and Optically Controllable Liquid Crystal Grating with a Patterned Surface-Command Layer

Jang

Baac

Kim

et al. 2006

Molecular Crystals and Liquid Crystals

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We propose a liquid crystal (LC) binary grating that can be controlled both electrically and optically in a simple scheme. The optical control scheme is obtained through the surface-induced reorientation of the LC molecules on a patterned surface-command layer by a single pump irradiation. The electrical control of the diffraction efficiency is achieved through the change in the phase retardation by the application of a bias voltage for given optically induced LC director distribution. In a coupled scheme of the optical and electrical control, the diffraction efficiency can be easily optimized.

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Polarization properties and diffraction efficiencies of binary anisotropic gratings: general study and experiments on ferroelectric liquid crystals

Cited by 32 publications

References 19 publications

Design of a Polarization-Insensitive Diffraction Grating Device Based on a Dye-Doped Liquid Crystal in Polymer Networks

Design of a Polarization-Insensitive Diffraction Grating Device Based on a Dye-Doped Liquid Crystal in Polymer Networks

Programmable liquid crystal waveplate polarization gratings as elements for polarimetric and interference applications

Electrically and Optically Controllable Liquid Crystal Grating with a Patterned Surface-Command Layer

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