Azobenzene-modified photosensitive polymers offer the possibility to reshape flat films upon UV-Vis irradiation. The photochemical isomerization between trans-cis configurations is the key mechanism for surface relief grating (SRG) formation on the free surface of thin azo-polymeric films illuminated by structured illumination. In the present work, we consider a sandwich configuration wherein an azopolymeric film (PAZO) is coated by a plasma-deposited polyacrylic acid (PPAA). It is demonstrated that the PPAA coating protects the PAZO against dissolution in aqueous environment. More interestingly, light-induced SRG can still be formed in the PAZO film, and the resulting modulation is transferred to the PPAA coating above. Results obtained open the possibility of exploiting water-soluble azopolymers in bio-oriented applications. (C) 2016 Optical Society of America
Surface-relief formation in azo-polyelectrolyte layers with a protective polymer coating / Frascella, F.; Angelini, A.; Ricciardi, S.; Pirri, F.; Descrovi, E.. - In: OPTICAL MATERIALS EXPRESS. - ISSN 2159-3930. - 6:2(2016), pp. 444-450. [10.1364/OME.6.000444]
Surface-relief formation in azo-polyelectrolyte layers with a protective polymer coating
Angelini, A.;Descrovi, E.
2016
Abstract
Azobenzene-modified photosensitive polymers offer the possibility to reshape flat films upon UV-Vis irradiation. The photochemical isomerization between trans-cis configurations is the key mechanism for surface relief grating (SRG) formation on the free surface of thin azo-polymeric films illuminated by structured illumination. In the present work, we consider a sandwich configuration wherein an azopolymeric film (PAZO) is coated by a plasma-deposited polyacrylic acid (PPAA). It is demonstrated that the PPAA coating protects the PAZO against dissolution in aqueous environment. More interestingly, light-induced SRG can still be formed in the PAZO film, and the resulting modulation is transferred to the PPAA coating above. Results obtained open the possibility of exploiting water-soluble azopolymers in bio-oriented applications. (C) 2016 Optical Society of America| File | Dimensione | Formato | |
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