Highly stable polarization gratings in photocrosslinkable polymer liquid crystals

Abstract

Highly stable polarization gratings have been prepared in photocrosslinkable polymer liquid-crystal films by the use of two orthogonally polarized He–Cd laser beams and subsequent annealing. The resulting pure polarization gratings exhibiting thermal stability up to 150 °C diffract the beam and convert the polarization state at the same time according to the theoretical expectation.

Formation of positive and negative anisotropic holographic gratings depending on recording energy in photoreactive liquid crystalline copolymer films

“…In photo-cross-linkable liquid crystalline polymer or copolymer systems, polarization gratings can be formed by holography and proximity exposure using a photomask [25][26][27][28][29]. The resulting gratings have a relatively large birefringence of greater than 0.2, thermal durability of more than 150°C, high-transparency in the visible region, and a command surface for low-molecular-mass liquid crystal alignment.…”

Optical and Physical Applications of Photocontrollable Materials: Azobenzene-Containing and Liquid Crystalline Polymers

“…Anisotropic gratings have the function of polarization conversion in the diffracted beams and these typical conversion characteristics can also be found in polarization holography, as well-known [94]. This type of applications is advancing.…”

Effects of recording wavelength on three-dimensional vector holograms in photoreactive liquid crystal composites

“…Holographic recordings of polarization gratings in photosensitive anisotropic organic materials have been widely studied [1][2][3][4][5][6][7][8][9][10][11][12]. The interest is mainly due to their unique optical properties, including polarization selectivity of the diffraction efficiency and polarization conversion in the diffraction process [3][4][5][7][8][9][10][11][12][13][14][15].…”

“…The interest is mainly due to their unique optical properties, including polarization selectivity of the diffraction efficiency and polarization conversion in the diffraction process [3][4][5][7][8][9][10][11][12][13][14][15]. These properties make polarization gratings useful for numerous applications related to polarization control, measurement, and discrimination.…”