Novel Liquid Crystal Grating with a Relief Structure by a Simple UV Irradiation Process

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  • He Wen–Tao
    Department of Electrical and Electronic Engineering, Akita University, 1–1 Tegatagakuen–cho, Akita 010–8502, Japan
  • Nose Toshiaki
    Department of Electrical and Electronic Engineering, Akita University, 1–1 Tegatagakuen–cho, Akita 010–8502, Japan
  • Sato Susumu
    Department of Electrical and Electronic Engineering, Akita University, 1–1 Tegatagakuen–cho, Akita 010–8502, Japan

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  • Novel Liquid Crystal Grating with a Rel

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A novel method of fabricating a liquid crystal grating is proposed. The liquid crystal grating, which has a periodic groove structure, can be fabricated by a simple single-step process with UV irradiation through a grating photomask using a mixture of liquid crystal and prepolymer materials. Phase separation in the UV curing process leads to completely separated layers of liquid crystal and polymer sections with the surface-relief grating structure. The grating structure of the cured polymer layer is investigated by using a polarizing microscope and a scanning electron microscope (SEM). Voltage control property of the diffraction efficiency is also investigated and the applicability of this liquid crystal grating to an electrical switchable diffraction device is discussed.

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