Scattering light interference from liquid crystal polymer dispersion films

Chi Yen Huang; Ming Shann Tsai; Chi Huang Lin; Andy Ying Guey Fuh

doi:10.1143/jjap.41.1436

Scattering light interference from liquid crystal polymer dispersion films

Chi Yen Huang, Ming Shann Tsai, Chi Huang Lin, Andy Ying Guey Fuh

Graduate Institute of Photonics

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

The Qúetelet-type ring pattern is observed in liquid crystal polymer dispersion (LCPD) films. The clusters of the polymer network and liquid crystal (LC) domains with different director axes in the LCPD films serve as scatterers. Cells with unidirectional and multidirectional rubbings are fabricated. Experimental results show that the polarization of incident light, the applied voltage and the ambient temperature significantly affect the ring intensities. However, the contribution of the LC domains is not evident until the voltage is applied. Finally, rubbing the cells in multiple directions reveals that measurement of the Qúetelet-type ring intensity can be used to readily identify the orientation of the liquid crystals. This finding also reveals that the LCs in an LCPD mixture are aligned closer to the final rubbing direction than are pure LCs in a multidirectional rubbed cell. A simple model was proposed to explain the observations.

Original language	English
Pages (from-to)	1436-1440
Number of pages	5
Journal	Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume	41
Issue number	3 A
DOIs	https://doi.org/10.1143/jjap.41.1436
Publication status	Published - 2002 Mar

All Science Journal Classification (ASJC) codes

Engineering(all)
Physics and Astronomy(all)

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title = "Scattering light interference from liquid crystal polymer dispersion films",

abstract = "The Q{\'u}etelet-type ring pattern is observed in liquid crystal polymer dispersion (LCPD) films. The clusters of the polymer network and liquid crystal (LC) domains with different director axes in the LCPD films serve as scatterers. Cells with unidirectional and multidirectional rubbings are fabricated. Experimental results show that the polarization of incident light, the applied voltage and the ambient temperature significantly affect the ring intensities. However, the contribution of the LC domains is not evident until the voltage is applied. Finally, rubbing the cells in multiple directions reveals that measurement of the Q{\'u}etelet-type ring intensity can be used to readily identify the orientation of the liquid crystals. This finding also reveals that the LCs in an LCPD mixture are aligned closer to the final rubbing direction than are pure LCs in a multidirectional rubbed cell. A simple model was proposed to explain the observations.",

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AU - Huang, Chi Yen

AU - Tsai, Ming Shann

AU - Lin, Chi Huang

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