Scattering light interference from liquid crystal polymer dispersion films

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

Research output: Contribution to journalArticle

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 languageEnglish
Pages (from-to)1436-1440
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume41
Issue number3 A
Publication statusPublished - 2002 Mar 1

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Light interference
Liquid crystal polymers
Liquid crystals
light scattering
liquid crystals
Scattering
interference
polymers
Electric potential
Crystal orientation
rings
cells
Polarization
electric potential
Polymers
ambient temperature
Temperature
polarization
scattering
crystals

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

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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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Scattering light interference from liquid crystal polymer dispersion films. / Huang, Chi-Yen; Tsai, Ming Shann; Lin, Chi Huang; Fuh, Andy Ying Guey.

In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 41, No. 3 A, 01.03.2002, p. 1436-1440.

Research output: Contribution to journalArticle

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