Second harmonic generation studies of polymer-stabilized cholesteric texture films

Andy Ying Guey Fuh, Chi-Yen Huang, Cheuk Wah Lau

Research output: Contribution to journalConference article

Abstract

Using a mode-locking Nd:YAG laser, we measured the second harmonic generation (SHG) of polymer stabilized cholesteric texture (PSCT) films. SHG observed in these samples is due to the dielectric gradient which arises from the interfaces between the cholesteric liquid crystal/polymer and those between the adjacent cholesteric focal conic domains having different helical axis. Both of the SHG intensities and the electro-optical characteristics of PSCTs were measured as a function of polymer concentration. In addition, polymer network structures formed in PSCTs were investigated. Good correlations among the SHG measurements, electro-optical characteristics, and the polymer network morphologies were found. It means that SHG measurements could provide us another qualitative, nondestructive method to analyze the PSCT films. In addition, SHG change on polymerization can be used to monitor the polymerization of LC-polymer mixtures.

Original languageEnglish
Pages (from-to)66-75
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume3475
DOIs
Publication statusPublished - 1998 Dec 1
EventLiquid Crystals II - San Diego,CA, United States
Duration: 1998 Jul 201998 Jul 21

Fingerprint

Second Harmonic Generation
Harmonic generation
Texture
harmonic generations
Polymers
textures
Textures
polymers
Polymerization
Cholesteric liquid crystals
polymerization
Laser mode locking
Liquid crystal polymers
Qualitative Methods
Mode-locking
Nd:YAG Laser
Network Structure
Liquid Crystal
locking
YAG lasers

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

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abstract = "Using a mode-locking Nd:YAG laser, we measured the second harmonic generation (SHG) of polymer stabilized cholesteric texture (PSCT) films. SHG observed in these samples is due to the dielectric gradient which arises from the interfaces between the cholesteric liquid crystal/polymer and those between the adjacent cholesteric focal conic domains having different helical axis. Both of the SHG intensities and the electro-optical characteristics of PSCTs were measured as a function of polymer concentration. In addition, polymer network structures formed in PSCTs were investigated. Good correlations among the SHG measurements, electro-optical characteristics, and the polymer network morphologies were found. It means that SHG measurements could provide us another qualitative, nondestructive method to analyze the PSCT films. In addition, SHG change on polymerization can be used to monitor the polymerization of LC-polymer mixtures.",
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Second harmonic generation studies of polymer-stabilized cholesteric texture films. / Fuh, Andy Ying Guey; Huang, Chi-Yen; Lau, Cheuk Wah.

In: Proceedings of SPIE - The International Society for Optical Engineering, Vol. 3475, 01.12.1998, p. 66-75.

Research output: Contribution to journalConference article

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