Photoalignment and resulting holographic vector grating formation in composites of low molecular weight liquid crystals and photoreactive liquid crystalline polymers

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• 作者：Tomoyuki Sasaki ; Takashi Shoho ; Kohei Goto ; Kohei Noda…
• 刊名：Applied Physics B: Lasers and Optics
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：120
• 期：2
• 页码：217-222
• 全文大小：893 KB
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• 作者单位：Tomoyuki Sasaki (1)
  Takashi Shoho (1)
  Kohei Goto (2)
  Kohei Noda (1)
  Nobuhiro Kawatsuki (3)
  Hiroshi Ono (1)
  
  1. Department of Electrical Engineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata, 940-2188, Japan
  2. New Products Research Department, Nissan Chemical Industries, 488-6 Suzumi, Funabashi, Chiba, 274-0052, Japan
  3. Department of Applied Chemistry, University of Hyogo, 2167 Shosha, Himeji, Hyogo, 671-2280, Japan
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Electromagnetism, Optics and Lasers
  Physical Chemistry
  Laser Technology and Physics and Photonics
  Quantum Optics, Quantum Electronics and Nonlinear Optics
  Optical Spectroscopy and Ultrafast Optics
  Physics and Applied Physics in Engineering
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0649

文摘

Polarization holographic gratings were formed in liquid crystal (LC) cells fabricated from a mixture of low molecular weight nematic LC and a photoreactive liquid crystalline polymer (PLCP) with 4-(4-methoxycinnamoyloxy)biphenyl side groups. The diffraction properties of the gratings were analyzed using theoretical models which were determined based on the polarization patterns of the polarization holography. The results demonstrated that vector gratings comprised of periodic orientation distributions of the LC molecule were induced in the cells based on the axis-selective photoreaction of the PLCP. The vector gratings were erased by applying a sufficiently high voltage to the cells and then were reformed with no hysteresis after the voltage was removed. This phenomenon suggested that the PLCP molecules were stabilized based on the axis-selective photocrosslink reaction and that the LC molecules were aligned by the photocrosslinked PLCP. This LC composite with axis-selective photoreactivity is useful for various optical applications, because of their stability, transparency, and response to applied voltage.