Incoherent light-induced self-organization of molecules

Kandjani, S. Ahmadi; Barille, Régis; Dabos‐Seignon, Sylvie; Nunzi, Jean‐Michel; Ortyl, Ewelina; Kucharski, S.

doi:10.1364/ol.30.003177

Cited by 13 publications

(4 citation statements)

References 17 publications

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“…For instance, it was observed that the free surface of azobenzene polymer films could exhibit induced mass transport if exposed to a light intensity pattern [12]-it undergoes cyclic photoinduced trans-cis isomerization. Spontaneous patterning effects in azo-dye polymer films have already been reported [13] on planar substrates while illuminated by one single laser beam under specific experimental conditions. Since, laser beam parameters are modified by the turbulence, the structure formations inscribed on the thin film change accordingly.…”

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confidence: 89%

Simple turbulence measurements with azopolymer thin films

et al. 2013

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A simple method to measure the influence on the laser beam propagation by a turbid medium is proposed. This measurement is based on the inscription of a surface relief grating (SRG) on an azopolymer thin film. The grating obtained with a single laser beam after propagation into a turbulent medium is perturbed and directly analyzed by a CCD camera through its diffraction pattern. Later, by scanning the surface pattern with an atomic force microscope, the inscribed SRG is analyzed with the Radon transform. This method has the advantage of using a single beam to remotely inscribe a grating detecting perturbations during the beam path. A method to evaluate the refractive index constant structure is developed.

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confidence: 89%

Simple turbulence measurements with azopolymer thin films

et al. 2013

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“…Nunzi and co-workers demonstrated that the use of an incoherent light source is also efficient for the deformation of azopolymer nanospheres 46 and for printing a well-organized pattern at the surface of an azopolymer thin film. 47 Here, we focus our attention on the case of a linearly polarized light.…”

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confidence: 99%

Opposite photo-induced deformations in azobenzene-containing polymers with different molecular architecture: Molecular dynamics study

Ilnytskyi

Neher

Saphiannikova

2011

The Journal of Chemical Physics

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Photo-induced deformations in azobenzene-containing polymers (azo-polymers) are central to a number of applications, such as optical storage and fabrication of diffractive elements. The microscopic nature of the underlying opto-mechanical coupling is yet not clear. In this study, we address the experimental finding that the scenario of the effects depends on molecular architecture of the used azo-polymer. Typically, opposite deformations in respect to the direction of light polarization are observed for liquid crystalline and amorphous azo-polymers. In this study, we undertake molecular dynamics simulations of two different models that mimic these two types of azo-polymers. We employ hybrid force field modeling and consider only trans-isomers of azobenzene, represented as Gay-Berne sites. The effect of illumination on the orientation of the chromophores is considered on the level of orientational hole burning and emphasis is given to the resulting deformation of the polymer matrix. We reproduce deformations of opposite sign for the two models being considered here and discuss the relevant microscopic mechanisms in both cases.

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“…5 Further studies demonstrated that the use of an incoherent light source was also efficient in printing a well organized pattern at the surface of an azopolymer thin film. 6 Li et al 7 have decreased the size of the surface exposed to light by using colloidal spheres of azopolymer. Light irradiation could deform the azopolymer colloidal nanospheres.…”

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confidence: 99%