Photorefractivity and storage of holograhic gratings in dye- and fullerene-doped nematic liquid crystal film

Iam-Choon Khoo; Hong Li; Y. Liang; Kon-Well Wang

doi:10.1117/12.216993

18 August 1995 Photorefractivity and storage of holograhic gratings in dye- and fullerene-doped nematic liquid crystal film

Iam-Choon Khoo, Hong Li, Y. Liang, Kon-Well Wang

Author Affiliations +

Proceedings Volume 2529, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications; (1995) https://doi.org/10.1117/12.216993
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

In this paper, we describe the basic mechanisms and dynamics of photorefractivity, and holographic grating formations in dye- and fullerene C₆₀-doped nematic liquid crystal films. The effects are attributed to photo induced molecular axis reorientation in these nematic films. A nonlinear index coefficient n₂ of 10^-2 cm²/watt can be obtained in a 25 micrometer thick film, with an applied dc-voltage of approximately 1 volt. In fullerene C₆₀-doped films, these laser induced gratings can be made permanent and electronically modulated; they can be turned off and on by an ac voltage with response times of approximately 100 microsecond(s) and a few ms, respectively.

Citation Download Citation

Iam-Choon Khoo, Hong Li, Y. Liang, and Kon-Well Wang "Photorefractivity and storage of holograhic gratings in dye- and fullerene-doped nematic liquid crystal film", Proc. SPIE 2529, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications, (18 August 1995); https://doi.org/10.1117/12.216993

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