Photoassisted poling of azo dye doped polymeric films at room temperature

Sekkat, Zouheir; Dumont, Michel

doi:10.1007/bf00325395

Cited by 276 publications

(116 citation statements)

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“…The importance of organic and polymeric nonlinear optical (NLO) materials for applications in nonlinear optics is widely recognised, and there has been intensive research on these materials in the past decade [1,2]. Recently, photoinduced optical anisotropy in polymer/organic dye systems has been the subject of intensive investigations [3,4].…”

Section: Introductionmentioning

confidence: 99%

Dichroism of Poly(Methyl Methacrylate) Thin Films Doped with Disperse Orange 11 Molecules

Abbas

Khalil

2009

Acta Phys. Pol. A

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We investigate the absorption spectra of poly (methyl methacrylate) (PMMA) thin films doped with Disperse Orange 11 (DO11) dye molecules which change under illumination with visible light. Dichroism measurements of the kinetics of the transmission changes at 472 nm at room and low temperatures (−60• C ± 2 • C) have been investigated. Our data show that the photoisomerisation reaction and the light-induced polar orientation depend on the molecular structure of the polymer. Simultaneous UV-visible spectroscopy at low temperature confirms the existence of two forms of DO11 molecules (keto and enol forms), which are responsible for the interaction with irradiating laser light and forming an anisotropic structure inside the PMMA/DO11 thin film.

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Section: Introductionmentioning

confidence: 99%

Dichroism of Poly(Methyl Methacrylate) Thin Films Doped with Disperse Orange 11 Molecules

Abbas

Khalil

2009

Acta Phys. Pol. A

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“…The role of the two processes is manifested in the polar alignment of dye molecules in the polymeric guest/host systems, which is responsible for the development of the dichroism signals in the samples [1][2]9]. However, the extent of dichroism signals is governed by the polar nature of the dyes as well as their volumes.…”

Section: Discussionmentioning

confidence: 99%

“…The importance of organic and polymeric nonlinear optical (NLO) materials for applications in nonlinear optics is widely recognized, and there has been intensive research on these materials in the past decade [1][2]. Recently, photo-induced optical anisotropy in polymer/organic dye systems has been the subject of intensive investigations [3][4].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Dynamic Dichroism Properties of Disperse Orange 11 Molecules and Azo-Molecules Doped in Poly(Methyl Methacrylate) Thin Films: A Comparison

Abbas

Khalil

2010

Acta Phys. Pol. A

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We investigate the dichroism characteristics of poly (methyl methacrylate) PMMA thin films doped with DO11, DO3, DSR13 and DSR1 dye molecules, which change under illumination with visible light. Our data show that photoisomerisation, phototautomerization reactions and light-induced polar orientation are dependent on the molecular structure of the polymer. Polar structure and molecular size, as well as the chemical structure of PMMA host, are the dominant parameters that determine both the extent and speed of dichroism buildup and relaxation processes. Two forms of DO11 molecules (keto and enol forms), and two other forms of azo-based dyes (trans and cis forms) are responsible for the interaction with irradiating laser light and forming an anisotropic structure inside the PMMA/dye thin films.

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“…Chemical structure of optically active bis-azo homo-and co-polymers with MMA Non linear optical (NLO) properties, requiring an asymmetric response by the electronic system, can be achieved with push-pull substituents giving strongly differentiated electron distribution, and overall noncentrosymmetry in the bulk. They are based on electric field poling of dipoles in the material spin coated over a conducting substrate and then heated at a temperature above the glass transition temperature (Tg) (corona-poling), or submitted to photoassisted alignment in order to improve the electric field poling (Sekkat & Dumont, 1992). Azoaromatic derivatives are natural candidates to this application due to their large second-order NLO properties, ease of processing and architectural versatility with respect to inorganic counterparts such as LiNbO 3 .…”

Section: Fig 3 Statistical Photoorientation Of Azomoleculesmentioning

confidence: 99%