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Déformation photoinduite dans les films minces contenant des ...

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P-250s-4VChapter 4. Photomechanical response of hybrid metal/azo-polymer layered structures4V_line_2beam13020depth_4V_dots_1beamdepth_4V_line_2beamdepth_4V_line_1beamdepth_2V_line_2beamstip-sample_interactions sg-dr1(a)204v_line_1beam2V_line_2beamstip-sample_interactions sg-dr1(b)deformation amplitude (nm)15105deformation amplitude (nm)1510500 50 100 150 200 250 300dose (mJ.mm -2 )00 500 1000 1500dose (mJ.mm -2 )pastel-00527388, version 1 - 19 Oct 2010dots: single beam, 4Vline: single beam, 4Vline: 2 beams, 4Vline: 2 beams, 2VFigure 4.12: Photomechanical effects of the tip-sample interactions in a sol-gel Si-DR1film. Laser (λ = 473 nm) power density: 1 mW/mm 2 per beam (interference pattern);1 mW/mm 2 (single beam). Sample = sol-gel Si-DR1, 200 nm thick. (a) Near-fielddeformation amplitude under p-polarized uniform illumination (single beam); (b) nearfieldaverage deformation under p-polarized interference pattern (2 beams).only an enhancement of the π − phase deformation, in correspondence of the perpendicularfield maxima. We could relate this effect to the tip size and geometry, whichcould change significantly the local distribution of the different light field components.However, we have observed a significant decrease of the photo-deformation when increasingby 1 nm the tip-surface distance, which, on the other hand, doesn’t change muchthe spatial field distribution due to the tip. This indicates that the photo-deformationeffect is probably mainly dependent on the mechanical properties of the material underillumination and on the tip-sample mechanical interaction, rather than simply on anoptical near-field effect. However, this remains an open question, which requires furtherinvestigations.

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