DÃ©formation photoinduite dans les films minces contenant des ...

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Chapter 1. The azobenzene molecules: photochromic materials and photodeformationeffects 161.4 Conclusionspastel-00527388, version 1 - 19 Oct 2010The photomechanical response in azo-containing thin films depends on the characteristicsof the material and of the illumination. In particular, an important influence ofthe light polarization on the amplitude, the dynamics and the orientation of the photoinduceddeformation has been observed. Two mechanisms seem to be at the originof the deformation. On one hand, the matrix photoexpansion, which produces smallreliefs in the enlightened zones and is related to the matrix re-organization subsequentto the photoisomerization cycles of the azobenzene molecules. On the other hand, thematter migration, a more complex mechanism, whose interpretation is still debated. Ithas generally been observed a matter motion from the enlightened zones towards thedarker areas, its efficiency being strongly dependent on the light polarization. However,under combined exposure to an incoherent homogenous assisting beam and to aperpendicularly polarized interference pattern, a relief growth in correspondence to theilluminated zones is observed. A similar discrepancy is observed between the far-fieldand the near-field experiments, where, in the first case, matter migrates away from theilluminated zones, while in the second case it is accumulated in the vicinity of the illuminatingtip. Several different approaches have been proposed to model these phenomena,however the lack of direct correlated data on the light field spatial distribution and thephotoinduced deformation makes it very arduous to obtain a complete description.
Bibliography[1] G. S. Hartley. The cis-form of azobenzene. Nature, 140:281, 1937.pastel-00527388, version 1 - 19 Oct 2010[2] Almeria Natansohn and Paul Rochon. Photoinduced motions in azo-containingpolymers. Chemical Reviews, 102(11):4139–4176, 10 2002. URL http://dx.doi.org/10.1021/cr970155y.[3] Kevin G. Yager and Christopher J. Barrett. Novel photo-switching usingazobenzene functional materials. Journal of Photochemistry and PhotobiologyA: Chemistry, 182(3):250 – 261, 2006. ISSN 1010-6030. doi: DOI:10.1016/j.jphotochem.2006.04.021. URL http://www.sciencedirect.com/science/article/B6TGY-4K18VSP-1/2/c00807901259cd303aba19c5442fe822. Proceedingsof 7th AIST International Symposium on Photoreaction Control and PhotofunctionalMaterials, 7th AIST International Symposium on Photoreaction Controland Photofunctional Materials.[4] S. P. Bian, J. M. Williams, D. Y. Kim, L. A. Li, S. Balasubramanian, J. Kumar,and S. Tripathy. Photoinduced surface deformations on azobenzene polymer films.Journal Of Applied Physics, 86(8):4498–4508, October 1999.[5] Nirmal K. Viswanathan, Srinivasan Balasubramanian, Lian Li, Sukant K. Tripathy,and Jayant Kumar. A detailed investigation of the polarization-dependent surfacerelief-gratingformation process on azo polymer films. Japanese Journal of AppliedPhysics, 38(Part 1, No. 10):5928–5937, 1999. doi: 10.1143/JJAP.38.5928. URLhttp://jjap.ipap.jp/link?JJAP/38/5928/.[6] K. Ichimura, S. K. Oh, and M. Nakagawa. Light-driven motion of liquids on aphotoresponsive surface. Science, 288(5471):1624–1626, June 2000.[7] N. Landraud, J. Peretti, F. Chaput, G. Lampel, J. P. Boilot, K. Lahlil, and V. I.Safarov. Near-field optical patterning on azo-hybrid sol-gel films. Applied PhysicsLetters, 79(27):4562–4564, December 2001.17
Page 1 and 2: Thèse de doctorat de l’Ecole Pol
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Page 7: ContentsAbstractiAcknowledgementsii
Page 10 and 11: List of Figures1.1 The trans/cis ph
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Page 18 and 19: Introduction 2In this work, we stud
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Page 22 and 23: Introduction 6azobenzene-containing
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Chapter 3. Microscopic mechanisms a
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TOPOGRAPHYgratamplxxphotoexpansion
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pmmaChapter 3. Microscopic mechanis
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Chapter 4. Photomechanical response
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sg+goldChapter 4. Photomechanical r
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P-250s-4VChapter 4. Photomechanical
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P-250s-4VChapter 4. Photomechanical
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Chapter 5Nanostructured hybrid syst
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Chapter 5. Nanostructured hybrid sy
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Bibliography[1] A. Natansohn, P. Ro
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Conclusionspastel-00527388, version
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Bibliography[1] Chi-Ming Che et Al.
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Appendix A 156⎛ ⎞ ⎛n g sinθ
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Appendix A 158hence for each compon
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Appendix BPhotoisomerization dynami
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Appendix B 162( 1Since λ 2 = −(
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Appendix C 164L = 5000 nmu = 1 nmL!
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Appendix D 166n. light power densit
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Bibliography[1] A. Natansohn, P. Ro
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Bibliography 170azobenzene-containi
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Bibliography 172as estimated from a
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Bibliography 174[53] C. Barrett, A.
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