Improved NLO properties through a liquid crystal phase poling

Jae Suk Lee, Young Sun Cho, Gyoujin Cho, Kyeong Taek Jung, Yong Gun Shul

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Abstract

Cross-linkable organic NLO chromophore called DRS was chemically incorporated into silica matrices using the sol-gel process. A number of electrically poled DRS/silica matrix systems were studied to elucidate the relaxation of the oriented organic chromophore by following the decay of UV absorption as a function of time and temperatures. The value of the second harmonic coefficient d33 was 47 pm/V for the DRS/silica matrix films (0.4 μm thickness). From the dramatic decrease in the UV absorption after poling at 80 °C, it is speculated that the DRS may act as a liquid crystalline mesogenic group and is effectively oriented in poling at the phase (nematic) transition temperature (80 °C). This argument was substantiated by investigating the phase behavior of DRS itself using both DSC and a polarized optical microscope. The DRS/silica system contained the ideal matrices to retain the oriented chromophore because of optical clarity, thermal stability and effective poling at the nematic liquid crystalline phase.

Original languageEnglish
Pages (from-to)2827-2831
Number of pages5
JournalAIChE Journal
Volume43
Issue number11 A
Publication statusPublished - 1997 Dec 1

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All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Environmental Engineering
  • Chemical Engineering(all)

Cite this

Lee, J. S., Cho, Y. S., Cho, G., Jung, K. T., & Shul, Y. G. (1997). Improved NLO properties through a liquid crystal phase poling. AIChE Journal, 43(11 A), 2827-2831.