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April 15-16, 2019 | Frankfurt, Germany
Applied Physics & Laser, Optics and Photonics
International Conference on
Materials Science and Nanotechnology | Volume: 3
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Layer-by-layer films for photonics devices: Analysis of birefringence creation and
relaxation on azopolymer nanostructures
Maria Raposo
University of Lisbon, Portugal
Enhanced optical properties for memories
and photonic applications can be focused on
the molecular control that can be achieved with
some fabrication techniques. One of these is
the layer-by-layer technique which is based on
the adsorption of oppositely charged materials
which allows the development of nanostructured
polymer/organic films and consequently is able
to produce supramolecular architectures. The
most interesting properties of the nanostructures
prepared by this technique is the precise control
of its thickness and composition. However, also
their properties may be tuned synergistically
having into account the adsorption variables
during the preparation of the nanostructure’s
layers. Examples of these synergistic activities
may be found in layer-by-layer nanostructures of
azopolymers, which present their photoinduced
properties altered by varying the electrostatic
interactions responsible for the nanostructure
formation. In this presentation will be presented
the achieved conclusions about the properties of
layer-by-layer nanostructures of poly(allylamine
hydrochloride) (PAH) and poly{1-(4-(3-carboxy-
4-hydroxyphenylazo) benzenesulfonamido)-1,2-
ethanediyl, sodium salt} (PAZO) when submitted to
birefringence creation and relaxationwhen varying
the variables of adsorption(e.g. pH, ionic strength),
the number of consecutive cycles of birefringence
induction and the power and wavelength of the
writing laser beam.
Speaker Biography
Maria Raposo has completed her PhD in 1999 from Sao Paulo University,
Brazil. She is professor of University of Lisbon, Portugal. Since 2008,
she is head of the Functional Molecular Systems group which research
interests include electric and optical properties of ultra-thin films of
polymers and biomolecules, interfaces and nanotechnology, colloids,
molecular architectures for electronics, photonics and magnetism,
biomimetic membranes and radiation effect in biological systems. She
has over 100 publications that have been cited over 1000 times, and
her publication H-index is 18 and has been serving as an editorial board
member of some Journals.
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