Properties of Holographic Gratings Formed in Nematic Liquid Crystals Doped with Carbon Nanotubes

• Main Authors: Hsu-Chih Chen, 陳旭志
• Other Authors: Wei Lee
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/23468012203736132731

碩士 === 中原大學 === 應用物理研究所 === 89 === The best grating arrangement was observed in 25-mm-thick cells of nematic liquid crystals doped with carbon nanotubes as the optimal external dc bias at 9 V was applied. Beyond 20 V, the grating became non-sinusoidal and the transmitted energy was found in the first-order diffraction primarily. At optimal applied dc bias the grating diffraction can be generated with an optical power as low as 1.6 mW, indicating that the samples exhibited extra-large optical anisotropy. Besides, we could generate permanent gratings in our samples, and the first-order diffraction intensity was changed when differently polarized laser passed through the grating. We discussed the changes according to the incident angle and the angle of the sample orientation for grating recording.