Observation of self-diffraction by gratings in nematic liquid crystals doped with carbon nanotubes

Wei Lee*, Chi Shen Chiu

*Corresponding author for this work

Research output: Contribution to journalArticle

74 Scopus citations

Abstract

Diffraction gratings were studied in cells of the homogeneously aligned liquid-crystal E7 doped with multiwall carbon nanotubes. These phase gratings were induced by interference modulation of two coherent optical beams, in conjunction with an applied dc field that was perpendicular to the unperturbed director axis. Self-diffraction was observed at all angles of incidence of the writing beams, including normal incidence. A superior nonlinear-index coefficient of 5 × 102 cm2/W was obtained after passage of a 44-mW/cm2 beam through a film with a grating constant of 18 μm under an external voltage of 15 V. The observed phenomenon depends strongly on the applied dc field, and the memory effect in a nematic film depends strongly on the grating constant.

Original languageEnglish
Pages (from-to)521-523
Number of pages3
JournalOptics Letters
Volume26
Issue number8
DOIs
StatePublished - 15 Apr 2001

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