[en] We have investigated the influence of the temperature on the photoinduced birefringence as well as on the diffraction efficiency of azo dye doped or grafted polymers. The samples are composed of three polymer matrices containing 2, 5-dimethyl-4-(p-nitrophenylazo anisole). We propose two theoretical models to explain the experimental increase of both phenomena when the temperature is decreased. Models are based on the statistical angular distribution of the chromophores that depends on the intensity of the polarized laser beam in the media, counteracted by the thermal agitation. Parameters introduced in both models can be used to characterize the polymeric system properties.
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Center for Education and Research on Macromolecules (CERM)
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P. M. Lundquist, R. Wortmann, C. Geletneky, R. J. Twieg, M. Jurich, V. Y. Lee, C. R. Moylan, and D. M. Burland, "Organic glasses: a new class of photorefractive materials," Science 274, 1182-1184 (1996).
J. Xu, G. Zhang, Q. Wu, Y. Liang, S. Liu, X. Chen, and Y. Shen, "Holographic recording and light amplification in doped polymer film, " Opt. Lett. 20, 504-506 (1995).
S. V. O'Leary, "Real-time processing by degenerate four-wave mixing in polarization sensitive dye-impregnated polymer films," Opt. Commun. 104, 245-250 (1994).
L. R. Dalton, A. W. Harper, B. Wu, R. Ghosn, J. Laquindanum, Z. Liang, A. Hubble, and C. Xu, "Polymeric electrooptic modulators: materials synthesis and processing," Adv. Mater. 7, 519-540 (1995).
B. L. Volodin, B. Kippelen, K. Meerholz, B. Javidi, and N. Peyghambarian, "A polymeric organical pattern recognition system for security verification," Nature (London) 383, 58-60 (1996).
P. M. Lundquist, C. Poga, R. G. De Voe, Y. Jia, W. E. Moerner, M.-P. Bemal, H. Coufal, and R. K. Grygier, "Holographic digital data storage in a photorefractive polymer," Opt. Lett. 21, 890-892 (1996).
M. S. Ho, A. Natansohn, and P. Rochon, "Azo polymers for reversible optical storage. 7. The effect of the size of the photochromic groups," Macromolecules 28, 6124-6127 (1995).
T. Todorov, L. Nikolova, and N. Tomova, "Polarization holography. 1: A new high-efficiency organic material with reversible photoinduced birefringence," Appl. Opt. 23, 4309-4312 (1984).
T. Buffeteau and M. Pézolet, "In situ study of photoinduced orientation in azopolymers by time-dependent polarization modulation infrared spectroscopy," Appl. Opt. 50, 948-955 (1996).
A. M. Makushenko, B. S. Neporent, and O. V. Stolbova, "Reversible orientation photodichroism and photoisomerization of aromatic azo compounds. I: Model of the system," Opt. Spectrosc. (USSR) 81, 295-299 (1971).
L. Nikolova, P. Markovsky, N. Tomova, V. Dragostinova, and N. Mateva, "Optically-controlled photo-induced birefringence in photo-anisotropic materials," J. Mod. Opt. 35, 1789-1799 (1988).
P. Rochon, J. Gosselin, A. Natansohn, and S. Xie, "Optically induced and erased birefringence and dichroism in azoaromatic polymers," Appl. Phys. Lett. 60, 4-5 (1992).
P. A. Blanche, Ph. C. Lemaire, C. Maertens, P. Dubois, and R. Jérôme, "Polarised light induced birefringence in azo dye doped polymer: a new model and polarised holographic experiments," Opt. Commun. 139, 92-98 (1997).
M. Dumont, "A common model for optical ordering of photoisomerizable molecules," in Photorefractive Organic Materials. Science and Applications, F. Kajzar, V. M. Agranovich, and C. Y.-C. Lee, eds. (Kluwer Academic, Amsterdam, 1996), Vol. 9, pp. 501-511.
L. Nikolova, T. Todorov, N. Tomova, and V. Dragostinova, "Polarization-preserving wavefront reversal by four-wave mixing in photoanisotropic materials," Appl. Opt. 27, 1598-1602 (1988).
J. S. Hwang, G. J. Lee, and T. K. Lim, "Temperature dependence of photo-induced anisotropy of azo-doped polymer film at the glass transition region of a polymer matrix," J. Korean Phys. Soc. 27, 392-395 (1994).
S. Ivanov, I. Yakovlev, S. Kostromin, and V. Shibaev, "Laser-induced birefringence in homeotropic films of photochromic comb-shaped liquid-crystalline copolymers with azobenzene moieties at different temperatures," Makromol. Chem. 12, 709-715 (1991).
O.-K. Song, C. H. Wang, and M. A. Pauley, "Dynamic processes of optically induced birefringence of azo compounds in amorphous polymers below Tg," Macromolecules 30, 6913-6919 (1997).
B. Kippelen, N. Peyghambarian, S. R. Lyon, A. B. Padias, and H. K. Hall, Jr., "New highly efficient photorefractive polymer composite for optical storage and image-processing applications," Electron. Lett. 29, 1873-1874 (1993).
K. Meerholz, B. L. Volodin, Sandalphon, B. Kippelen, and N. Peyghambarian, "A photorefractive polymer with high optical gain and diffraction efficiency near 100%," Nature (London) 371, 497-500 (1994).
C. Maertens, P. Dubois, R. Jérôme, P.-A. Blanche, and P. C. Lemaire, "Synthesis and polarized light induced birefringence of new polymethacrylates containing carbazolyl and azobenzene pendant groups," J. Polym. Sci., Part B: Polym. Phys. 38, 205-213 (2000).
P. A. Blanche, Ph. C. Lemaire, C. Maertens, P. Dubois, and R. Jérôme, "Temperature variation of the photoinduced birefringence of an azo dye doped polymer," Polym. Eng. Sci. 38, 406-412 (1999).
L. Lamarre and C. S. P. Sung, "Studies of physical aging and molecular motion by azochromophorric labels attached to the main chains of amorphous polymers," Macromolecules 16, 1729-1736 (1983).
Y. Atassi, J. A. Delaire, and K. Nakatani, "Coupling between photochromism and second-harmonic generation in spiropyran- and spirooxazin-doped polymer films," J. Appl. Chem. 99, 16320-16326 (1995).
M. Dumont, G. Froc, and S. Hosotte, "Alignment and orientation of chromophores by optical pumping," Nonlinear Opt. 9, 327-338 (1995).
A. Yariv and P. Yeh, Optical Waves in Crystals (Wiley, New York, 1984), pp. 121-154.
Z. Sekkat, J. Wood, and W. Knoll, "Reorientation mechanism of azobenzenes within the Tran → Cis photoisomerization," J. Phys. Chem. 99, 17226-17234 (1995).
T. G. Pedersen, P. M. Johansen, N. C. R. Holme, P. Ramanujam, and S. Hvilsted, "Theoretical model of photoinduced anisotropy in liquid-crystalline azobenzene side-chain polyesters," J. Opt. Soc. Am. B 15, 1120-1129 (1998).
I. Mita, K. Horie, and K. Hirao, "Photochemistry in polymer solids. 9. Photoisomerization of azobenzene in a polycarbonate film," Macromolecules 22, 558-563 (1989).
S. Xie, A. Natansohn, and P. Rochon, "Recent development in aromatic azo polymers research," Chem. Mater. 5, 403-411 (1993).
Z. Sekkat and M. Dumont, "Photoinduced orientation of azo dyes in polymeric films. Characterization of molecular angular mobility," Synth. Met. 54, 373-381 (1993).
N. G. McCrum, B. E. Read, and G. Williams, Anelastic and Dielectric Effects in Polymeric Solids (Wiley, New York, 1967), pp. 169-174.
M. L. Williams, R. F. Landel, and J. D. Ferry, "The temperature dependence of relaxation mechanisms in amorphous polymers and other glass-forming liquids," J. Am. Chem. Soc. 77, 3701-3707 (1955).
C. D. Eisenbach, "Effect of polymer matrix on the cis-trans isomerization of azobenzene residues in bulk polymers," Makromol. Chem. 179, 2489-2506 (1978).
D. Kermisch, "Nonuniform sinusoidally modulated dielectric gratings," J. Opt. Soc. Am. 59, 1409-1414 (1969).
L. B. Au, J. C. W. Newell, and L. Solymar, "Non-uniformities in thick dichromated gelatin transmission gratings," J. Mod. Opt. 34, 1211-1225 (1987).
H. Kogelnik, "Coupled wave theory for thick hologram grating," Bell Syst. Tech. J. 48, 2909-2947 (1969).
R. N. Haward, The Physics of Glassy Polymers (Wiley, New York, 1973), pp. 25-41 and 171-176.
C. Maertens, P. Dubois, R. Jérôme, P.-A. Blanche, and Ph. C. Lemaire, "Dynamics of the photoinduced orientation and relaxation of new polymethacrylates containing carbazolyl and azobenzene pendant groups," Polym. Int. 48, 205-211 (1999).
P. A. Blanche, Ph. C. Lemaire, C. Maertens, P. Dubois, and R. Jérôme, "Polarization holography reveals the nature of the grating in azo-dye contained polymers," J. Opt. Soc. Am. B (to be published).
P.-A. Blanche, P. C. Lemaire, M. Dumont, and M. Fischer, "Photoinduced orientation of azo dye in various polymer matrices," Opt. Lett. 24, 1349-1351 (1999).
S. Ducharme, J. C. Scott, R. J. Twieg, and W. E. Moerner, "Observation of the photorefractive effect in a polymer," Phys. Rev. Lett. 86, 1846-1849 (1991).
W. E. Moerner, S. M. Silence, F. Hache, and G. C. Bjorklund, "Orientationally enhanced photorefractive effect in polymer," J. Opt. Soc. Am. B 11, 320-330 (1994).
W. E. Moerner, A. Grunnet-Jepsen, C. L. Thompson, and R. J. Twieg, "Mechanisms of photorefractivity in polymer composites," in Organic Photorefractive Materials and Xerographic Photoreceptors, S. Ducharme and J. W. Stasiak, eds., Proc. SPIE 2850, 2-13 (1996).
