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

Abbas, B.; Khalil, M. Alshikh

doi:10.12693/aphyspola.117.904

Cited by 8 publications

(4 citation statements)

References 17 publications

(24 reference statements)

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“…Photoinduced optical anisotropy in organic dyes is the subject of intensive care (study) and investigations [10][11][12][13][14]. The importance of these optical materials for applications is quite apparent in many fields of modern optics, among which, optical data storage, photonics, optoelectronics, and all-optical modulation [11,12].…”

Section: Introductionmentioning

confidence: 99%

Nanostructured dye films of 4-tricyanovinyl-N,N-diethylaniline (TCVA) for optoelectronic applications: microstructure change and electrical conductivity improvement under UV irradiated effect

Garni¹,

Darwish²

2020

Phys. Scr.

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This article was committed to synthesizing thin films of 4-tricyanovinyl-N,N-diethylaniline (TCVA) by the thermal evaporation technique. The UV light then irradiated these films for different exposure times. Infrared spectroscopy demonstrated that the evaporation method is a good one to get un-dissociated TCVA films, and these films have excellent radiation stability. The x-ray diffraction pattern at room temperature confirms TCVA films have a nanocrystalline structure. These films are transformed into the amorphous structure after UV irradiation, indicating the increase of the disorder in these films. The optical spectroscopy of TCVA films was recorded before and after irradiation. It was found that the optical band gap decreases from 1.56 to 1.49 eV, and Urbach’s energy increases after UV irradiation. The electrical studies showed that the value of electrical conductivity increases and the value of activation energy decreases after UV irradiation.

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Section: Introductionmentioning

confidence: 99%

Nanostructured dye films of 4-tricyanovinyl-N,N-diethylaniline (TCVA) for optoelectronic applications: microstructure change and electrical conductivity improvement under UV irradiated effect

Garni¹,

Darwish²

2020

Phys. Scr.

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“…Dye molecules are well known for their properties of photochromism [5], which is a reversible change between two species having different absorption spectra, and can be induced by photoirradiation. When a thin polymer film is exposed to linearly polarized light, photo-orientation of the dye molecules produces dichroic and birefringent films [6][7][8]. Various kinds of guest-host polymeric systems have been investigated incorporating different kinds of organic dyes [8].…”

Section: Introductionmentioning

confidence: 99%

“…When a thin polymer film is exposed to linearly polarized light, photo-orientation of the dye molecules produces dichroic and birefringent films [6][7][8]. Various kinds of guest-host polymeric systems have been investigated incorporating different kinds of organic dyes [8]. Saphiannikova et al [9] reviewed the microscopic mechanism behind photo-induced deformations in side-chain azobenzene polymers.…”

Section: Introductionmentioning

confidence: 99%

Dynamic behavior of photo-induced orientation of poly(methyl methacrylate) – Solvent Red 23 thin films

2015

Self Cite

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We investigate the effect of the photo-orientation and stability of the Solvent Red 23 dye incorporated in poly(methyl methacrylate) thin films as a guest-host system. A probe-pump optical system was used to investigate the dichroic behavior of the samples. Orthogonally polarized laser lights induce a smaller increase in the transmitted beam intensity. A stronger polar order was induced using a parallel probe-pump laser light compared to that of the perpendicular state. It was found that the dichroic ratio value of the poly(methyl methacrylate) -Solvent Red 23 thin film increased by 0.174 at the photostationary state, indicating that the net orientation of Solvent Red 23 molecules has increased 17.4% in the direction perpendicular to the applied beam field. The dynamic evolution of the dichroic ratio showed that the relaxation is rather slow, and it deteriorates in a slow exponential fashion, which may take a very long time to reach the isotropic state. The contrast ratios were 0.449 and 0.267 in parallel and orthogonal probe-pump configurations, respectively. The order parameter calculations reveal that about 70% of photo-induced anisotropy remains after relaxation for a long time.PACS Nos.: 61.30. Gd, 33.55.+b, 78.20.Ek, 78.66.Qn. Résumé :Nous étudions l'effet de photo-orientation et de stabilité du colorant solvant rouge 23 dans des films minces de poly (méthyl méthacrylate), composant un système invité-hôte. Nous utilisons un système pompe-sonde optique pour analyser le comportement dichroïque des échantillons. Le faisceau laser à polarisation orthogonale induit une plus petite augmentation dans l'intensité transmise. Un plus grand ordre polaire est induit en utilisant une lumière laser pompe-sonde parallèle que dans le cas perpendiculaire. Nous trouvons que la valeur du rapport dichroïque du film mince poly (méthyl méthacrylate) -solvant rouge 23 augmente de 0,174 à l'état photo-stationnaire, indiquant que l'orientation nette des molécules du solvant rouge 23 a augmenté de 17.4 % dans la direction perpendiculaire au faisceau appliqué. L'évolution dynamique du rapport dichroïque indique que la relaxation est plutôt lente et elle se détériore en une lente exponentielle, ce qui peut demander un très long temps pour atteindre un état isotrope. Le rapport de contraste est 0.449 et 0.267 pour des configurations de pompe-sonde parallèle et orthogonale respectivement. Les calculs du paramètre d'ordre révèlent qu'à peu près 70 % de l'anisotropie induite demeure longtemps après la relaxation. [Traduit par la Rédaction]

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“…Continuous wave lasers ranging from mW to kW are widely used in many applications [7]. Wide range of materials including liquid crystals, porphyrins, dyes, semiconductor nanoparticles, thin films, phthalocyanines and crystals are known to be optically nonlinear under cw laser illumination [8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Self diffraction and nonlinear optical properties for 2, 3- Diaminopyridine under cw illumination

Imran¹

2014

IOSRJEN

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The nonlinear absorption and refraction indices for 2,3-Diaminopyridine solution were measured using open-and closed-aperture z-scan techniques, with continuous wave (cw) irradiation. Furthermore, diffraction rings pattern as a result of nonlinear refraction was observed. The effect of concentration, wavelength and laser intensity on the nonlinear absorption, nonlinear refraction and diffraction rings are studied experimentally. It is found that the nonlinear refraction and absorption indexes in order of 10 -8 cm 2 /W and10 -3 cm/W, respectively. We suggested an opportunity to form a new nonlinear-optical media for nonlinear optical application.

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

Cited by 8 publications

References 17 publications

Nanostructured dye films of 4-tricyanovinyl-N,N-diethylaniline (TCVA) for optoelectronic applications: microstructure change and electrical conductivity improvement under UV irradiated effect

Nanostructured dye films of 4-tricyanovinyl-N,N-diethylaniline (TCVA) for optoelectronic applications: microstructure change and electrical conductivity improvement under UV irradiated effect

Dynamic behavior of photo-induced orientation of poly(methyl methacrylate) – Solvent Red 23 thin films

Self diffraction and nonlinear optical properties for 2, 3- Diaminopyridine under cw illumination

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