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Proceedings Paper

Reconfigurable 3D and 2D micro-structures array by directional laser manipulation (Conference Presentation)
Author(s): Federica Pirani; Angelo Angelini; Francesca Frascella; Serena Ricciardi; Federico Ferrarese Lupi; Natascia De Leo; Luca Boarino; Emiliano Descrovi

Paper Abstract

In recent years, the ability to pattern large areas at the micro- and nano-scale with stimuli-responsive materials has opened the opportunity to engineer surface structures and trigger peculiar properties such as complex optical functionalities or surface properties by laser-matter interactions. The use of light-sensitive materials, such as azobenzene compounds, can open the opportunity to active manipulate in terms of morphology, physical and mechanical properties a pre-patterned architectures, which are intrinsically static once fabricated. We employ azopolymers, in which the rapid and reversible photoisomerization reaction of azobenzene molecules can actuate mass transport phenomena typically parallel to the light polarization. The azopolymeric film is patterned by soft-imprinting as an array of micro-holes showing a well-defined isotropic round pores. Upon a linearly polarized illumination (365 nm, 150 W/cm2), we observe a deformation of the initial holes along the polarization direction, in such a way that the circular pores are transformed into long closed slits. A rotation of the polarization by 90° triggers a reconfiguration of the pristine round shape, with a good degree of control of the photo-induced pore reshaping. Due to the polarized-directionality of the photo-manipulation we demonstrate the possibility to tune the pristine morphology and properties along specific directions, providing a smart engineered platform with different reshaped micro-patterns. The light-induced contraction and expansion reshaping strategy of a porous polymeric structures shows exciting potential for a number of applications including microfluidics, lithography and tissue engineering. Tuning cells behavior in response to material manipulation cues is a promising goal in biology

Paper Details

Date Published: 19 September 2017
Proc. SPIE 10360, Light Manipulating Organic Materials and Devices IV, 103600B (19 September 2017); doi: 10.1117/12.2273223
Show Author Affiliations
Federica Pirani, Politecnico di Torino (Italy)
Angelo Angelini, Politecnico di Torino (Italy)
Francesca Frascella, Politecnico di Torino (Italy)
Serena Ricciardi, Politecnico di Torino (Italy)
Federico Ferrarese Lupi, Istituto Nazionale di Ricerca Metrologica (Italy)
Natascia De Leo, Istituto Nazionale di Ricerca Metrologica (Italy)
Luca Boarino, Istituto Nazionale di Ricerca Metrologica (Italy)
Emiliano Descrovi, Politecnico di Torino (Italy)

Published in SPIE Proceedings Vol. 10360:
Light Manipulating Organic Materials and Devices IV
Manfred Eich; Jean-Michel Nunzi; Jon A. Schuller; Joy E. Haley, Editor(s)

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