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 journalConference article

Abstract

The Quetélet-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 Quetelet-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)204-213
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume4799
DOIs
Publication statusPublished - 2002 Dec 1

Fingerprint

Light interference
Liquid Crystals
Liquid crystal polymers
Light Scattering
Liquid Crystal
Liquid crystals
light scattering
Polymers
Interference
liquid crystals
Scattering
interference
polymers
Electric potential
Ring
Crystal orientation
rings
Cell
cells
Voltage

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

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title = "Scattering light interference from liquid crystal polymer dispersion films",
abstract = "The Quet{\'e}let-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 Quetelet-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: Proceedings of SPIE - The International Society for Optical Engineering, Vol. 4799, 01.12.2002, p. 204-213.

Research output: Contribution to journalConference article

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