Improved NLO properties through a liquid crystal phase poling

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

Research output: Contribution to journalArticle

1 Citation (Scopus)

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

Fingerprint

Liquid Crystals
Silicon Dioxide
Liquid crystals
Chromophores
Silica
Crystalline materials
Transition Temperature
Phase Transition
Liquids
Polymethyl Methacrylate
Phase behavior
Sol-gel process
Superconducting transition temperature
Microscopes
Thermodynamic stability
Hot Temperature
Gels
Temperature

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.
Lee, Jae Suk ; Cho, Young Sun ; Cho, Gyoujin ; Jung, Kyeong Taek ; Shul, Yong-Gun. / Improved NLO properties through a liquid crystal phase poling. In: AICHE Journal. 1997 ; Vol. 43, No. 11 A. pp. 2827-2831.
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Lee, JS, Cho, YS, Cho, G, Jung, KT & Shul, Y-G 1997, 'Improved NLO properties through a liquid crystal phase poling', AICHE Journal, vol. 43, no. 11 A, pp. 2827-2831.

Improved NLO properties through a liquid crystal phase poling. / Lee, Jae Suk; Cho, Young Sun; Cho, Gyoujin; Jung, Kyeong Taek; Shul, Yong-Gun.

In: AICHE Journal, Vol. 43, No. 11 A, 01.12.1997, p. 2827-2831.

Research output: Contribution to journalArticle

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Lee JS, Cho YS, Cho G, Jung KT, Shul Y-G. Improved NLO properties through a liquid crystal phase poling. AICHE Journal. 1997 Dec 1;43(11 A):2827-2831.