Thermal grating with threshold in polymer dispersed liquid crystals

F. Simoni, G. Cipparrone, D. Duca, C. Umeton, Iam-choon Khoo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Measurements of the degenerate wave mixing phenomenon that occurs between a pump and signal beam after the onset of transparency in a polymer dispersed liquid crystal (PDLC) are reported. The experimental procedure and results are described. These materials contain nematic microdroplets in a polymeric matrix; therefore, they produce a strong light scattering that depends on the difference between the refractive indices of the nematic droplets and the polymer. In a dye-doped sample, the light absorption produces thermal indexing. A strong change in the transmission occurs when the liquid-crystal droplets become isotropic, thus approaching the refractive index of the polymeric matrix. In this way, the effect of self-transparency can be observed. The results are believed to be the first demonstration of nonlinear light diffraction in a PDLC sample.

Original languageEnglish (US)
Title of host publicationXVII International Conference on Quantum Electronics. Digest of
PublisherPubl by IEEE
StatePublished - 1990
Event17th International Conference on Quantum Electronics - IQEC '90 - Anaheim, CA, USA
Duration: May 21 1990May 25 1990

Other

Other17th International Conference on Quantum Electronics - IQEC '90
CityAnaheim, CA, USA
Period5/21/905/25/90

Fingerprint

Liquid crystal polymers
Transparency
Refractive index
Light scattering
Liquid crystals
Light absorption
Demonstrations
Dyes
Diffraction
Pumps
Polymers
Hot Temperature

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Simoni, F., Cipparrone, G., Duca, D., Umeton, C., & Khoo, I. (1990). Thermal grating with threshold in polymer dispersed liquid crystals. In XVII International Conference on Quantum Electronics. Digest of Publ by IEEE.
Simoni, F. ; Cipparrone, G. ; Duca, D. ; Umeton, C. ; Khoo, Iam-choon. / Thermal grating with threshold in polymer dispersed liquid crystals. XVII International Conference on Quantum Electronics. Digest of. Publ by IEEE, 1990.
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Simoni, F, Cipparrone, G, Duca, D, Umeton, C & Khoo, I 1990, Thermal grating with threshold in polymer dispersed liquid crystals. in XVII International Conference on Quantum Electronics. Digest of. Publ by IEEE, 17th International Conference on Quantum Electronics - IQEC '90, Anaheim, CA, USA, 5/21/90.

Thermal grating with threshold in polymer dispersed liquid crystals. / Simoni, F.; Cipparrone, G.; Duca, D.; Umeton, C.; Khoo, Iam-choon.

XVII International Conference on Quantum Electronics. Digest of. Publ by IEEE, 1990.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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T1 - Thermal grating with threshold in polymer dispersed liquid crystals

AU - Simoni, F.

AU - Cipparrone, G.

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AU - Umeton, C.

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N2 - Measurements of the degenerate wave mixing phenomenon that occurs between a pump and signal beam after the onset of transparency in a polymer dispersed liquid crystal (PDLC) are reported. The experimental procedure and results are described. These materials contain nematic microdroplets in a polymeric matrix; therefore, they produce a strong light scattering that depends on the difference between the refractive indices of the nematic droplets and the polymer. In a dye-doped sample, the light absorption produces thermal indexing. A strong change in the transmission occurs when the liquid-crystal droplets become isotropic, thus approaching the refractive index of the polymeric matrix. In this way, the effect of self-transparency can be observed. The results are believed to be the first demonstration of nonlinear light diffraction in a PDLC sample.

AB - Measurements of the degenerate wave mixing phenomenon that occurs between a pump and signal beam after the onset of transparency in a polymer dispersed liquid crystal (PDLC) are reported. The experimental procedure and results are described. These materials contain nematic microdroplets in a polymeric matrix; therefore, they produce a strong light scattering that depends on the difference between the refractive indices of the nematic droplets and the polymer. In a dye-doped sample, the light absorption produces thermal indexing. A strong change in the transmission occurs when the liquid-crystal droplets become isotropic, thus approaching the refractive index of the polymeric matrix. In this way, the effect of self-transparency can be observed. The results are believed to be the first demonstration of nonlinear light diffraction in a PDLC sample.

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Simoni F, Cipparrone G, Duca D, Umeton C, Khoo I. Thermal grating with threshold in polymer dispersed liquid crystals. In XVII International Conference on Quantum Electronics. Digest of. Publ by IEEE. 1990