RISU_TOP.GIF - 4,722BYTES  Najimiah Radiah Binti Mohamad

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In this research, we used two coherent laser beams to form intensity-modulated light pattern for fabricating holographic polymer dispersed liquid crystal (PDLC). In previous work, higher diffraction efficiencies can be obtained by higher exposure energy that significantly changed the orientation of the liquid crystal to align parallel with grating vector from perpendicular alignment. In the present study, further investigation of holographic PDLC diffraction characteristic has been done by varying for both grating constants and exposure energy. As the results, high diffraction efficiency shown for small grating constants caused by high optical anisotropy and strongly dependence to incident angle. Furthermore, LC is reoriented parallel to grating vector from perpendicular alignment according to higher exposure energy through molecular migration during the phase separation and polymerization degree of the photoreactive monomer.

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1. Rotation of director during holographic recording in polymer dispersed liquid crystals, H. Ono, N. R. Mohamad, T. Sasaki, N. Kawatsuki and A. Ogiwara, Liq. Cryst. 35 (2008) 633-639.

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3. ‚Q‚O‚O‚W”N‚P‚OŒŽ Molecular Electronics and Bioelectronics, Korea-Japan Joint Forum 2008 (KJF2008)
Effects of exposure energy and grating constants of holographic PDLC on director of liquid crystals
N. R. Mohamad, A. Emoto, T. Sasaki, T. Shioda, H. Ono, A. Ogiwara, and N. Kawatsuki

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