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|Type of Document
||Study of Holographic Recording in Diacrylate Mesogens Using 632.8 nm He-Ne Laser|
|Date of Defense
polymer liquid crystal
|| He-Ne Laser induced polymerization in diacrylate mesogens RM257 had been verified in previous studies. Holography patterns can also be recorded in RM257 using He-Ne Laser. Higher diffraction efficiency was obtained by controlling temperature of the mesogen.|
In the present study, we consider the diacrylate compound RM82 that is main chain polymeric liquid crystal with different length of chain. We focus on two objectives in this study: (i) to investigate polymerization and absorbance of RM82 thin film that was exposed to He-Ne laser with the temperature of sample control, the initial power intensity of laser beam and the exposed time. (ii)Using the result of part (i), the possibility of the use of RM82 thin film for recording holographic patterns produced using a laser beam emitted from a 12mW He-Ne laser operated at 633 nm wavelength is studied.
The periodic structures and orientated diacrylate polymer networks are produced in the polymer film by holographic field produced using He-Ne laser. The region of light stripes was aligned perpendicular to the gratings, whereas the region of dark stripes was disorder.
||Tsung-Hsien Lin - chair|
Mei-Ying Chang - co-chair
Wei Lee - co-chair
Wenjun Zheng - advisor
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|Date of Submission