Thin films of conjugated polymers (CPs) were explored for photothermal pattering of active materials. Due to the semiconductive nature of the CP films, CP film was heated upon NIR exposure via photothermal conversion. Various photothermal patterns were generated from the light pattern generated from POLs. The distance from the POL to the CP substrate was controlled to obtain the target light patterns with the maximum overlap or separation among the diffracted lights. From the light patterns we were able to generate micro thermal patterns to large area thermal pattern, and multiple thermal patterns. The photothermal patterns were used to pattern active layers such as cell sheets which are sensitive to heat. Using thermally responsive interfacing layer (TRI) made of collagen, cell sheets of various shapes were harvested to provide a non-invasive method of live cell sheet preparation. When photothermal CPs were coated on a thermally expandable TRI, the bilayer was folded within few sec of NIR exposure, to generate a complex 3D structure. The degree of folding and reversibility of folding were dependent on the thickness of both CP layer and TRI layer.
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Hanwhuy Lim, Jongbeom Na, Minsu Han, Beonggwan Kim, Eunkyoung Kim, "Conjugated polymer thin films for dynamic generation of photothermal patterns (Erratum)," Proc. SPIE 10355, Nanobiosystems: Processing, Characterization, and Applications X, 103550I (12 October 2017);