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509 results on '"KAJZAR, FRANCOIS"'

31. Polymeric Materials and their Orientation Techniques for Second-Order Nonlinear Optics

Author

Kajzar, Francois, Lee, Kwang-Sup, Jen, Alex K. -Y., Abe, Akihiro, editor, Albertsson, Ann-Christine, editor, Cantow, Hans-Joachim, editor, Dušek, Karel, editor, Edwards, Sam, editor, Höcker, Hartwig, editor, Joanny, Jean-François, editor, Kausch, Hans-Henning, editor, Kobayashi, S., editor, Lee, Kwang-Sup, editor, Nuyken, Oskar, editor, Stupp, Samuel I., editor, Suter, Ulrich W., editor, Wegner, Gerhard, editor, and Young, Robert J., editor

Published
2003
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42. Influencing intramolecular motion with an alternating electric field

Author

Bermudez, Veronica, Capron, Nathalie, Gase, Torsten, Gatti, Francesco G., Kajzar, Francois, Leigh, David A., Zerbetto, Francesco, and Zhang, Songwei

Subjects
Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Author(s): Veronica Bermudez [1]; Nathalie Capron [2]; Torsten Gase [1]; Francesco G. Gatti [3]; François Kajzar [1]; David A. Leigh (corresponding author) [3]; Francesco Zerbetto [2]; Songwei Zhang [3] Analogues [...]

Published
2000
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43. Photoresponsive natural materials

Author

Anton, Adina Mirela, primary, Pădurețu, Carla-Cezarina, additional, Marin, Cosmina Andreea, additional, Simion, Alina-Marieta, additional, Simion, Cristian, additional, Kajzar, Francois, additional, and Rău, Ileana, additional

Published
2019
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48. Kinetics of diffraction gratings formation in a polymer matrix containing azobenzene chromophores: Experiments and Monte Carlo simulations.

Author

Pawlik, Grzegorz, Mitus, Antoni C., Miniewicz, Andrzej, and Kajzar, Francois

Subjects
POLYMERS, MONTE Carlo method, PHOTOISOMERIZATION, LIGHTING
Abstract

The physical processes accompanying an illumination of azobenzene chromophores embedded in a polymer matrix with spatially modulated and linearly polarized light are studied experimentally and simulated using the Monte Carlo (MC) method. The MC simulations base on a simple three-channel kinetic model of trans-cis type photoisomerization cycles in azobenezene molecules. The method focus on studying the kinetics of diffraction grating recording and erasing under various conditions of illumination, light polarization and recording in the presence or absence of a background light. By modeling the “macroscopic” light diffraction efficiency one gets insight into the role played by microscopic processes (angular hole burning, angular redistribution, rotational diffusion) up to the high-temperature limit, characterized by a high mobility of polymer chains. The obtained qualitative agreement between experimental data and the modeling confirms that the main processes underlying grating recording and erasing are well identified. The experimentally observed two-exponential functional dependence of diffraction efficiency η as function of time is well explained by the MC modeling. © 2003 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2003
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49. Relaxation kinetics of photoinduced surface relief grating on azopolymer films.

Author

Matsui, Tatsunosuke, Yamamoto, Shin-ichiro, Ozaki, Masanori, Yoshino, Katsumi, and Kajzar, Francois

Subjects
RELAXATION phenomena, THIN films
Abstract

The relaxation kinetics of the photoinduced surface relief grating (SRG) formed on an azopolymer film after stopping laser beam writing has been systematically investigated. In addition to a photoinduced increase of the diffraction efficiency in the SRG, an anomalous further enhancement of the efficiency was observed even without light irradiation, after the recording light beam was switched off. This anomalous relaxation process consists of two components with short and long relaxation times, and strongly depends on the temperature and polarization of the probe beam used for the diffraction measurement. At lower temperatures the anomalous growth is more effective and the fast component is dominant. From the results of the polarization dependence of the diffraction efficiency and optical absorption, it has been manifested that the fast component of the relaxation originates from the cis-trans thermal isomerization of azobenzene in the side chain. The origin of the slow decay is also discussed in terms of the order parameter change of the azomolecules caused by the reorientational relaxation. [ABSTRACT FROM AUTHOR]

Published
2002
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50. Surface enhanced second harmonic generation from macrocycle, catenane, and rotaxane thin films: Experiments and theory

Author

Arfaoui, Imad, Kajzar, Francois, Bermudez, Veronica, Leigh, David A., Bottari, Giovanni, Lubomska, Monika, De Nadai, Celine, Mendoza, Sandra M., Jalkanen, Jukka- Pekka, Niziol, Jacek, Rudolf, Petra, and Zerbetto, Francesco

Subjects
Dielectric films -- Research, Thin films -- Research, Molecular structure -- Research, Silver -- Structure, Silver -- Research, Chemicals, plastics and rubber industries
Abstract

Surface enhanced second harmonic generation (SE SHG) experiments on molecular structures, macrocycles, catenanes, and rotaxanes, deposited as monolayers and multilayers by vacuum sublimation on silver, are reported. The study shows that catenanes and rotaxanes represent a new class of potentially interesting molecules with mobile parts for application in photonics.

Published
2006

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