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

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Chapter 3. Microscopic mechanisms at the origin of the photo-induced deformation inazobenzene-containing thin films 68A (nm)16014012010080604020angoli_New_with_saturation_matter_migration60˚30˚45˚75˚90˚15˚10˚5˚efficiencyEFFICIENCY (a. u.)1.25101513045_new60auto_new75900.80.60.40.2saturation amplitudespeed_correfficinital growth ratesat_corr_Naverage deformation efficiency00 500 1000 1500time (s)time500 15 30 45 60 75 90Sangle! (deg.)Ppastel-00527388, version 1 - 19 Oct 2010(a)Figure 3.9: Mass migration SRG growth efficiency: (a) mass migration SRG growthkinetics for various polarization axis angles ϕ; (b) kinetic curves in (a) normalized withrespect to the curve obtained at ϕ = 45 ◦ ; (c) SRG growth: saturation amplitude (✕),computed as the maximum SRG amplitude normalized with respect to a fixed arbitraryvalue (150 nm); SRG growth rate (□) measured as the slope of the SRG growth overthe first 100 s and normalized with respect to the growth rate observed at ϕ = 45 ◦ ;deformation efficiency () computed as the time averaged values of the curves in (b)over their respective overall growth time.efficient case, and by averaging over their respective overall growth time, in order totake into full account the growth rate and the saturation amplitude of the deformationkinetics. This is represented in Figure 3.9 where we show (a) the kinetics (absolutevalue) of the SRG formation associated with matter migration for the various angles,(b) the mass migration efficiency () compared to the maximum deformation values(✕) normalized with respect to an arbitrary value of 150 nm and the SRG growth rate(□) averaged on the first 100 s (since in this range the evolution is quasi-linear) andnormalized with respect to the growth rate at ϕ = 45 ◦ , for the different polarizationaxis angles.We observe that the parameters describing the SRG growth are distributed quite symmetricallyaround the configuration at 45 ◦ , except for the case of the s and p polarizations.A more detailed analysis of the electromagnetic field distribution will show thatthe two polarization configurations are indeed not symmetric.(b)
N.B. I i = E i E i *Chapter 3. Microscopic mechanisms at the origin of the photo-induced deformation inazobenzene-containing thin films 695000(a)(b)y (nm) y (nm)05000I (a. u.) I (a. u.)!xE g,tot!yE g,totpastel-00527388, version 1 - 19 Oct 2010(c)5000y (nm)000 5000x (nm)I (a. u.)0 5000x (nm)!zE g,totFigure 3.10: (a-c) left: calculated field amplitude spatial distribution (absolute values)of (a) ⃗ E x g,tot, (b) ⃗ E y g,tot, (c) ⃗ E z g,tot on the xy-plane, for a polarization angle ofϕ = 30 ◦ ; right: amplitude profile (absolute value) along the x-axis, corresponding toeach field component; incidence angle = 16.5 ◦ , λ = 473 nm, period ≃ 830 nm, 1mW/mm 2 per beam.3.3.2 InterpretationWe consider the time averaged 5phi = 30a = Ix, b = Iy, c = Izspatial distribution of the electric field amplitudes| ⃗ E x g,tot|, | ⃗ E y g,tot |, | ⃗ E z g,tot| in the xy plane (z = 0). In Figure 3.10(left) we show thecalculation performed in the case of ϕ = 30 ◦ from top to bottom (x-, y-, z- componentsof the light field, respectively), while on the right we report the corresponding amplitudeprofiles along the x-axis. The relative spatial shift of the x-, y- and z- componentprojections on the x-axis is the same for every xy-plane 6 , if we neglect the contributionof the absorption in the film along the z-axis. In this sense, we remark that the light5 Over a period T ≃ 10 −15 s.6 See Appendix A.
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Thèse de doctorat de l’Ecole Pol
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AcknowledgementsAt the beginning it
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vpastel-00527388, version 1 - 19 Oc
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ContentsAbstractiAcknowledgementsii
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List of Figures1.1 The trans/cis ph
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List of Figuresxiipastel-00527388,
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pastel-00527388, version 1 - 19 Oct
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Introduction 2In this work, we stud
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Bibliography[1] A. Natansohn, P. Ro
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Introduction 6azobenzene-containing
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"##$%&'()')*#'+(%,-.(/#'011'2'"(%)(
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Chapter 1. The azobenzene molecules
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Page 34 and 35: Chapter 1. The azobenzene molecules
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sg+goldChapter 4. Photomechanical r
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Chapter 4. Photomechanical response
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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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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 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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