Orientational photorefractive effects in nematic liquid crystal films

Research output: Contribution to journalArticle

227 Citations (Scopus)

Abstract

We present a detailed theoretical discussion of the fundamental mechanisms for the recently observed nonlinear electro-optical effects in nematic liquid crystal films. Detailed expressions for the three principal mechanisms for space charge fields formation and various dielectric, conductivity and flow induced torques that are responsible for the liquid crystal director axis reorientation process are derived. We have observed strong optical wave mixing effects such as two-beam energy coupling and self-diffraction; the observed effects, their magnitude and dynamics, and dependencies on various physical parameters are found to be in good agreement with theories.

Original languageEnglish (US)
Pages (from-to)525-534
Number of pages10
JournalIEEE Journal of Quantum Electronics
Volume32
Issue number3
DOIs
StatePublished - Mar 1 1996

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Nematic liquid crystals
Electrooptical effects
Electric space charge
Liquid crystals
Torque
Diffraction
liquid crystals
electro-optical effect
retraining
torque
space charge
conductivity
diffraction
energy

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

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Orientational photorefractive effects in nematic liquid crystal films. / Khoo, Iam-choon.

In: IEEE Journal of Quantum Electronics, Vol. 32, No. 3, 01.03.1996, p. 525-534.

Research output: Contribution to journalArticle

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AB - We present a detailed theoretical discussion of the fundamental mechanisms for the recently observed nonlinear electro-optical effects in nematic liquid crystal films. Detailed expressions for the three principal mechanisms for space charge fields formation and various dielectric, conductivity and flow induced torques that are responsible for the liquid crystal director axis reorientation process are derived. We have observed strong optical wave mixing effects such as two-beam energy coupling and self-diffraction; the observed effects, their magnitude and dynamics, and dependencies on various physical parameters are found to be in good agreement with theories.

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