Polymer dispersed liquid crystals--New materials for nonlinear optics

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

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

Abstract

Summary form only given. Several nonlinear optical effects observed in dye doped polymer dispersed liquid crystals (PDLC) are discussed. In one experiment, dye doped samples of PDLC were used to enhance the thermal nonlinearities induced by light absorption. The light scattering depends on the index mismatch δ = neff 2 - np 2, where neff is the effective refractive index of the droplet and np is the refractive index of the polymeric matrix. The absorption of radiation by the dye molecules and subsequent thermalization process heats the PDLC sample, thus changing the quantity δ through the thermal indexing effect. In a second experiment, thermal grating was induced in PDLC. The nonlinear light diffraction which shows a typical threshold behavior due to the self-transparency effect was studied. Phase and amplitude gratings were created under different experimental conditions. Finally, the coupling of the orientational and thermal properties of liquid crystals have been exploited to obtain all-optical switching and bistability in PDLC.

Original languageEnglish (US)
Title of host publicationFirst Int Meet Nonlinear Opt Mater Phenom Devices NLO 90
PublisherPubl by IEEE
Pages77
Number of pages1
StatePublished - 1990
EventFirst International Meeting on Nonlinear Optics: Materials, Phenomena and Devices - NLO '90 - Kauai, HI, USA
Duration: Jul 16 1990Jul 20 1990

Other

OtherFirst International Meeting on Nonlinear Optics: Materials, Phenomena and Devices - NLO '90
CityKauai, HI, USA
Period7/16/907/20/90

Fingerprint

Nonlinear optics
Liquid crystal polymers
Dyes
Refractive index
Light scattering
Liquid crystals
Transparency
Light absorption
Thermodynamic properties
Diffraction
Experiments
Radiation
Molecules
Hot Temperature

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Simoni, F., Cipparrone, G., Duca, D., Umeton, C., & Khoo, I. (1990). Polymer dispersed liquid crystals--New materials for nonlinear optics. In First Int Meet Nonlinear Opt Mater Phenom Devices NLO 90 (pp. 77). Publ by IEEE.
Simoni, F. ; Cipparrone, G. ; Duca, D. ; Umeton, C. ; Khoo, Iam-choon. / Polymer dispersed liquid crystals--New materials for nonlinear optics. First Int Meet Nonlinear Opt Mater Phenom Devices NLO 90. Publ by IEEE, 1990. pp. 77
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abstract = "Summary form only given. Several nonlinear optical effects observed in dye doped polymer dispersed liquid crystals (PDLC) are discussed. In one experiment, dye doped samples of PDLC were used to enhance the thermal nonlinearities induced by light absorption. The light scattering depends on the index mismatch δ = neff 2 - np 2, where neff is the effective refractive index of the droplet and np is the refractive index of the polymeric matrix. The absorption of radiation by the dye molecules and subsequent thermalization process heats the PDLC sample, thus changing the quantity δ through the thermal indexing effect. In a second experiment, thermal grating was induced in PDLC. The nonlinear light diffraction which shows a typical threshold behavior due to the self-transparency effect was studied. Phase and amplitude gratings were created under different experimental conditions. Finally, the coupling of the orientational and thermal properties of liquid crystals have been exploited to obtain all-optical switching and bistability in PDLC.",
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year = "1990",
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Simoni, F, Cipparrone, G, Duca, D, Umeton, C & Khoo, I 1990, Polymer dispersed liquid crystals--New materials for nonlinear optics. in First Int Meet Nonlinear Opt Mater Phenom Devices NLO 90. Publ by IEEE, pp. 77, First International Meeting on Nonlinear Optics: Materials, Phenomena and Devices - NLO '90, Kauai, HI, USA, 7/16/90.

Polymer dispersed liquid crystals--New materials for nonlinear optics. / Simoni, F.; Cipparrone, G.; Duca, D.; Umeton, C.; Khoo, Iam-choon.

First Int Meet Nonlinear Opt Mater Phenom Devices NLO 90. Publ by IEEE, 1990. p. 77.

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

TY - GEN

T1 - Polymer dispersed liquid crystals--New materials for nonlinear optics

AU - Simoni, F.

AU - Cipparrone, G.

AU - Duca, D.

AU - Umeton, C.

AU - Khoo, Iam-choon

PY - 1990

Y1 - 1990

N2 - Summary form only given. Several nonlinear optical effects observed in dye doped polymer dispersed liquid crystals (PDLC) are discussed. In one experiment, dye doped samples of PDLC were used to enhance the thermal nonlinearities induced by light absorption. The light scattering depends on the index mismatch δ = neff 2 - np 2, where neff is the effective refractive index of the droplet and np is the refractive index of the polymeric matrix. The absorption of radiation by the dye molecules and subsequent thermalization process heats the PDLC sample, thus changing the quantity δ through the thermal indexing effect. In a second experiment, thermal grating was induced in PDLC. The nonlinear light diffraction which shows a typical threshold behavior due to the self-transparency effect was studied. Phase and amplitude gratings were created under different experimental conditions. Finally, the coupling of the orientational and thermal properties of liquid crystals have been exploited to obtain all-optical switching and bistability in PDLC.

AB - Summary form only given. Several nonlinear optical effects observed in dye doped polymer dispersed liquid crystals (PDLC) are discussed. In one experiment, dye doped samples of PDLC were used to enhance the thermal nonlinearities induced by light absorption. The light scattering depends on the index mismatch δ = neff 2 - np 2, where neff is the effective refractive index of the droplet and np is the refractive index of the polymeric matrix. The absorption of radiation by the dye molecules and subsequent thermalization process heats the PDLC sample, thus changing the quantity δ through the thermal indexing effect. In a second experiment, thermal grating was induced in PDLC. The nonlinear light diffraction which shows a typical threshold behavior due to the self-transparency effect was studied. Phase and amplitude gratings were created under different experimental conditions. Finally, the coupling of the orientational and thermal properties of liquid crystals have been exploited to obtain all-optical switching and bistability in PDLC.

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M3 - Conference contribution

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BT - First Int Meet Nonlinear Opt Mater Phenom Devices NLO 90

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Simoni F, Cipparrone G, Duca D, Umeton C, Khoo I. Polymer dispersed liquid crystals--New materials for nonlinear optics. In First Int Meet Nonlinear Opt Mater Phenom Devices NLO 90. Publ by IEEE. 1990. p. 77