手徵性向列型液晶中螺旋微米纖維結構的形成及光學特性

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手徵性向列型液晶中螺旋微米纖維結構的形成及光學特性

Helical microfilament formation and its optical property in chiral nematic liquid crystal

曹育銓 , Masters　　Advisor：陳惠玉　　

繁體中文

手徵性向列型液晶；螺旋纖維結構；電光效應； chiral nematic liquid crystal ； helical formation ； liquid crystal parameters

Abstract │ Reference (28)

Abstract 〈TOP〉

Parallel Abstract 〈TOP〉

This thesis investigate the formation of helical microfilament structure and observe its optical properties. The sample was prepared by mixing nematic liquid crystal with 15-wt% left-handed chiral dopant and was filled into a empty cell without any surface treatment. The intrinsic state of the sample is focal conic texture and due to the randomly orientation of the helical axis, it scatters the incident light. However, the scattering state can be switched to the high reflection state by external energy. When the sample was gotten an enough energy to form the homeotropic orientation, after releasing the energy, the high reflection state with helical microfilament structure can be generated. The two states-scattering and reflection states are stable states in a null field. Thus, we can make a bistable device by switching these two states. There are several methods to switch them: external force, amplitude modulation and frequency modulation. According to our observation, the sample presses great potential on the photonics devices in the future.

Reference ( 28 ) 〈TOP〉

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[2] Hu, W., Zhao, H., Song, L., Yang, Z., Cao, H., Cheng, Z., Liu, Q., & Yang, H. (2010). Electrically controllable selective reflection of chiral nematic liquid crystal/chiral ionic liquid composites. Advanced Materials, 22(4), 468-472.
[3] Yang, D. K., West, J. L., Chien, L. C., & Doane, J. W. (1994). Control of reflectivity and bistability in displays using cholesteric liquid crystals. Journal of applied physics, 76(2), 1331-1333.
[4] Heo, K. C., Sohn, Y., Yi, J., Kwon, J. H., Son, P. K., & Gwag, J. S. (2012). Reflective color display using thermochromic pigments. Applied optics, 51(18), 4246-4249.
[5] Heikenfeld, J., Drzaic, P., Yeo, J. S., & Koch, T. (2011). A critical review of the present and future prospects for electronic paper. Journal of the Society for Information Display, 19(2), 129-156.

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