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Holographic Grating Formed by Photochemical Phase Transition of Polymer Azobenzene Liquid Crystal

  • T. Yamamoto (a1), S. Yoneyama (a1), M. Hasegawa (a1), A. Kanazawa (a1), T. Shiono (a1) and T. Ikeda (a1)...

Abstract

We explored the formation of holographic gratings by means of a polymer azobenzene liquid crystal (PALC). When two writing beams (argon-ion laser, 488 nm, unpolarized) were interfered on the surface of the PALC film (thickness, 500 ∼ 600 nm), multiple diffraction beams were observed immediately, resulting from grating formation. Such generation of the diffraction beams was assumed to be due to a periodic induction of photochemical phase transition in the bright fringes of the interference pattern. The grating is namely made up of a periodic arrangement of nematic (N, dark fringes) and isotropic (I, bright fringes) phases. Observation of recorded interference patterns under a cross-polarized optical microscope supported our speculation for the structure of the grating. On the basis of these results, we succeeded in recording an image hologram of a photomask as an object.

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Holographic Grating Formed by Photochemical Phase Transition of Polymer Azobenzene Liquid Crystal

  • T. Yamamoto (a1), S. Yoneyama (a1), M. Hasegawa (a1), A. Kanazawa (a1), T. Shiono (a1) and T. Ikeda (a1)...

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