Orientational photorefractive effect in undoped and CdSe nanorods-doped nematic liquid crystal - Bulk and interface contributions

Iam Choon Khoo, Kan Chen, Yana Zhang Williams

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

In the work, we revisited the orientational photorefractive effect generated in nematic liquid crystal (NLC) in a degenerate four-wave mixing interaction configuration. A detailed calculation of the bulk laser-induced space-charge fields and analytical expressions for the reorientation angles and the required dc threshold fields are obtained and compared with experimental measurements. While the bulk theory could describe the general features of the self-diffraction and threshold fields, there are significant deviations from experimental observation, particularly in an observed lowering of the threshold voltage by the optical intensity. This effect is due to an optically induced surface-charge modulation. A theoretical analysis including both the bulk and the surface-charge-modulation effects allows us to obtain better agreement with experimental observations of the threshold voltages on the optical intensity and sample thicknesses, and to estimate the relative contributions from the bulk and surface effects. Recently observed enhanced photorefractive effects of CdSe nanorods-doped NLCs are also reported to corroborate these analyses and to provide guidelines to optimize the photorefractive effect for dynamic holographic application.

Original languageEnglish (US)
Pages (from-to)443-450
Number of pages8
JournalIEEE Journal on Selected Topics in Quantum Electronics
Volume12
Issue number3
DOIs
StatePublished - May 2006

All Science Journal Classification (ASJC) codes

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

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