| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Transient Reorientation of a Doped Liquid Crystal System under a Short Laser Pulse |
| LI Tao1, XIANG Ying2,3, LIU Yi-Kun4, WANG Jian5, YANG Shun-Lin6 |
| 1College of Chemistry and Life Science, China Three Gorges University, Yichang 4430022School of Information Engineering, Guangdong University of Technology, Guangzhou 5100063Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, PO Box 912, Beijing 1000834State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 5102755South China Institute of Environmental Science, MEP, Guangzhou 5100066Success Electronics Co. Ltd., Shenzhen 518132 |
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| Cite this article: |
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LI Tao, XIANG Ying, LIU Yi-Kun et al 2009 Chin. Phys. Lett. 26 086108 |
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Abstract The transient optical nonlinearity of a nematic liquid crystal doped with azo-dye DR19 is examined. The optical reorientation threshold of a 25-μm-thick planar-aligned sample of 5CB using a 50ns pulse duration 532nm YAG laser pulse is observed to decrease from 800mJ/mm2 to 0.6mJ/mm2 after the addition of 1 vol% azo dopant, a reduction of three orders of magnitude. When using a laser pulse duration of 10ns, no such effect is observed. Experimental results indicate that the azo dopant molecules undergo photoisomerization from trans-isomer to cis-isomer under exposure to light, and this conformation change reorients the 5CB molecules via intermolecular coupling between guest and host. This guest-host coupling also affects the azo photoisomerization process.
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| Keywords:
61.30.Gd
64.70.Md
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Received: 08 February 2009
Published: 30 July 2009
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| PACS: |
61.30.Gd
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(Orientational order of liquid crystals; electric and magnetic field effects on order)
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64.70.Md
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