Dye-doped photorefractive liquid crystals for dynamic and storage holographic grating formation and spatial light modulation

Iam Choon Khoo, Min Y.I. Shih, Michael V. Wood, Brett D. Guenther, Pao Hsu Chen, Francesco Simoni, Sergei S. Slussarenko, Oriano Francescangeli, Liana Lucchetti

Research output: Contribution to journalArticlepeer-review

131 Scopus citations

Abstract

The basic mechanisms of photo-induced space charge field formation, director axis re-orientation, and refractive index changes in fullerene C60- and dye-doped nematic liquid crystals films are presented. In particular, in aligned methyl-red-doped nematic liquid crystal film, we observe a nonlinear index change coefficient as high as 10 cm2/W, associated with purely optically induced liquid crystal director axis re-orientation. Experimental observations of dynamic and high-resolution storage holographic grating formation, two beam coupling with gain of nearly 3000 cm-1, optical limiting action at nanowatt cw laser power, and incoherent-coherent image conversion at μW/cm2 light intensity level are discussed.

Original languageEnglish (US)
Pages (from-to)1897-1911
Number of pages15
JournalProceedings of the IEEE
Volume87
Issue number11
DOIs
StatePublished - Jan 1 1999

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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