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Search Results: 1 - 10 of 167582 matches for " E. Ortyl "
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Photoinduced Doughnut-Shaped Nanostructures
A. M. Dubrovkin,R. Barille,E. Ortyl,S. Zielinska
Physics , 2014, DOI: 10.1016/j.cplett.2014.03.021
Abstract: We show that an incoherent unpolarized single-beam illumination is able to photoinduce nano-doughnuts on the surface of azopolymer thin films. We demonstrate that individual doughnut-shaped nano-objects as well as clusters of several adjacent nano-doughnuts can be formed and tailored with wide range of typical sizes, thus providing a rich field for applications in nanophotonics and photochemistry.
Near-Field Optical control of Doughnut-Shaped Nanostructures
A. M. Dubrovkin,R. Barille,E. Ortyl,S. Zielinska
Physics , 2014, DOI: 10.1016/j.optcom.2014.08.027
Abstract: The application of a local near-field optical excitation can be used to control step-by-step the reshape of individual doughnut-shaped azopolymer nano-objects by varying the time of illumination demonstrating its promising performance as a functional nano-object. The possibility to provide both photoinduced reshaping opens a way to the fundamental study of size-dependent scaling laws of optical properties, photoinduced reshaping efficiency and nanoreactor or nanoresonator behavior at nanometer scale. As an example the nano-object is used to self-assembly polystyrene nanospheres in a supraball.
Spontaneous formation of optically induced surface relief gratings
H. Leblond,R. Barille,S. Ahamadi-kandjani,J. -M. Nunzi,E. Ortyl,S. Kucharski
Physics , 2009, DOI: 10.1088/0953-4075/42/20/205401
Abstract: A model based on Fick's law of diffusion as a phenomenological description of the molecular motion, and on the coupled mode theory, is developped to describe single-beam surface relief grating formation in azopolymers thin films. It allows to explain the mechanism of spontaneous patterning, and self-organization. It allows also to compute the surface relief profile and its evolution in time with good agreement with experiments.
Multistate polarization addressing using one single beam in an azo polymer film
S. Ahmadi Kandjani,R. Barille,S. Dabos-Seignon,J. -M. Nunzi,E. Ortyl,S. Kucharski
Physics , 2005, DOI: 10.1364/OL.31.001923
Abstract: Peculiar light-matter interactions can break the rule that a single beam polarization can address only two states in an optical memory device. Multistate storage of a single beam polarization is achieved using self-induced surface diffraction gratings in a photo-active polymer material. The grating orientation follows the incident light beam polarization direction. The permanent self-induced surface relief grating can be readout in real time using the same laser beam.
Nonlocal communication with photoinduced structures at the surface of a polymer film
R. Barille,S. Dabos-Seignon,J. -M. Nunzi,S. Ahmadi Kandjani,E. Ortyl,S. Kucharski
Physics , 2006, DOI: 10.1364/OPEX.13.010697
Abstract: Nonlocal communication between two laser light beams is experimented in a photochromic polymer thin films. Information exchange between the beams is mediated by the self-induction of a surface relief pattern. The exchanged information is related to the pitch and orientation of the grating. Both are determined by the incident beam. The process can be applied to experiment on a new kind of logic gates.
Incoherent light induced self-organization of molecules
S. Ahmadi Kandjani,R. Barille,S. Dabos-Seignon,J. -M. Nunzi,E. Ortyl,S. Kucharski
Physics , 2005,
Abstract: Although coherent light is usually required for the self-organization of regular spatial patterns from optical beams, we show that peculiar light matter interaction can break this evidence. In the traditional method to record laser-induced periodic surface structures, a light intensity distribution is produced at the surface of a polymer film by an interference between two coherent optical beams. We report on the self-organization followed by propagation of a surface relief pattern. It is induced in a polymer film by using a low-power and small-size coherent beam assisted by a high-power and large-size incoherent and unpolarized beam. We demonstrate that we can obtain large size and well organized patterns starting from a dissipative interaction. Our experiments open new directions to improve optical processing systems.
Light mediated emergence of surface patterns in azopolymers at low temperatures
V. Teboul,R. Barille,P. Tajalli,S. Ahmadi-Kandjani,H. Tajalli,S. Zielinska,E. Ortyl
Physics , 2015, DOI: 10.1039/C5SM00846H
Abstract: Polymer thin films doped with azobenzene molecules do have the ability to organize themselves in spontaneous surface relief gratings (SRG) under irradiation with a single polarized beam. To shed some light in this still unexplained phenomenon, we use a new method that permits us to access experimentally the very first steps of the pattern formation process. Decreasing the temperature, we slow down the formation and organization of patterns, due to the large increase of the viscosity and relaxation time of the azopolymer. As a result decreasing the temperature allows us to access and study much shorter time scales,in the physical mechanisms underlying the pattern formation, than previously reported. We find that the patterns organize themselves in sub-structures which size increase with the temperature, following the diffusion coefficient evolution of the material. That result suggests that the pattern formation and organization is mainly governed by diffusive processes, in agreement with some theories of the SRG formation. Decreasing further the temperature we observe the emergence of small voids located at the junction of the sub-structures.
Multifractal characteristics of optical turbulence measured through a single beam holographic process
Dario G. Perez,Regis Barille,Yohann Morille,Sonia Zielinska,Ewelina Ortyl
Physics , 2014, DOI: 10.1364/OE.22.019538
Abstract: We have previously shown that azopolymer thin films exposed to coherent light that has travelled through a turbulent medium produces a surface relief grating containing information about the intensity of the turbulence; for instance, a relation between the refractive index structure constant C2 as a function of the surface parameters was obtained. In this work, we show that these films capture much more information about the turbulence dynamics. Multifractal detrended fluctuation and fractal dimension analysis from images of the surface roughness produced by the light on the azopolymer reveals scaling properties related to those of the optical turbulence.
Cognitive ability experiment with photosensitive organic molecular thin films
Regis Barille,Sohrab Ahmadi-Kandjani,Ewelina Ortyl,Stanislaw Kucharski,Jean-Michel Nunzi
Physics , 2006, DOI: 10.1103/PhysRevLett.97.048701
Abstract: We present an optical experiment which permits to evaluate the information exchange necessary to self-induce cooperatively a well-organized pattern in a randomly activated molecular assembly. A low-power coherent beam carrying polarization and wavelength information is used to organize a surface relief grating on a photochromic polymer thin film which is photo-activated by a powerful incoherent beam. We demonstrate experimentally that less than 1% of the molecules possessing information cooperatively transmit it to the entire photo-activated polymer film.
Cluster Model of Formation of Subnuclear and Subatomic Objects  [PDF]
E. E. Lin
Journal of Modern Physics (JMP) , 2014, DOI: 10.4236/jmp.2014.53018
Abstract:

The paper describes the development results on one-dimensional (1D) asymptotic model of the formation kinetics for the objects (clusters) of subnuclear (quark) and subatomic (nuclear) matters. A concept of the objects distribution density wave φ(a, t) in space of sizes a lies in the basis for analytical description of the processes under consideration. The proposed formalism makes it possible to describe in an adequate way the final outcomes of the well-known catastrophic phenomena in the world of elementary particles. Mass characteristics of different processes of approach to equilibrium in nuclear reactions are calculated.

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