Two-photon patterning of a polymer containing Y-shaped azochromophores
AMBROSIO, ANTONIO and MADDALENA, PASQUALINO and CARELLA, ANTONIO and BORBONE, FABIO and ROVIELLO, ANTONIO (2009) Two-photon patterning of a polymer containing Y-shaped azochromophores. [Pubblicazione su rivista scientifica]
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We report on the patterning of the free surface of azo-based polymer films by means of mass migration driven by one- or two-photon absorption. A symmetric donor-acceptor-donor structured Y-shaped azochromophore is specifically synthesized to enhance two-photon absorption in the polymer. The exposure of the polymer film to a focused laser beam results in light-driven mass migration for both one- and two-photon absorptions. Features with subdiffraction resolution (250 nm) are realized and the patterning dynamics is investigated as a function of the light dose. Furthermore, functional photonic structures, such as diffraction gratings with periods ranging between 0.5 and 2.0 μm, have been realized.
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