Optical nanomanipulation of nanostructures on azobenzene-containing films

Abstract : In the present work, we use the photoinduced mass transport in thin films containing azobenzene derivatives to manipulate matter at the nanoscopic scale. First, we develop a simple method to elaborate periodic arrays of metal structures with adjustable plasmonic properties. The dispersion diagrams of the surface plasmons are measured and exhibit, as expected, the opening of an energy bandgap and of an unusual momentum-gap. The latter arises from the interaction of the plasmon modes of the two interfaces on either side of the metal film. Near-field measurements show the localization of the plasmon-enhanced optical field on the periodic structure, in agreement with calculations by RCWA. Second, we demonstrate the optical control of the displacement of nanoparticles, both metallic and dielectric, on the surface of an azobenzene-containing thin film. Displacement over several microns is observed with the direction controlled by the light polarization. This provides a new toolkit to manipulate nanoparticles at the nanoscale and gives deeper insight into the mechanisms at the origin of the photoinduced mass transport in azobenzene-containing films.
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https://tel.archives-ouvertes.fr/tel-01808722
Contributor : Anh Duc Vu <>
Submitted on : Wednesday, June 6, 2018 - 12:18:56 AM
Last modification on : Wednesday, January 23, 2019 - 10:29:31 AM
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Anh-Duc Vu. Optical nanomanipulation of nanostructures on azobenzene-containing films. Materials Science [cond-mat.mtrl-sci]. Ecole polytechnique, Palaiseau, France, 2014. English. ⟨tel-01808722⟩

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