Phototactic Mass Transport in Polymer Films for Micropatterning and Alignment of Functional Materials


  • We thank H. Asami and I. Kamiya for kindly providing cadmium selenide nanocrystals and S. Morino, M. Nakagawa, and K. Arimitsu in our laboratory for technical assistance and discussions. This work was supported, in part, by a Grant-in-Aid for Scientific Research “KAKENHI (14740391)” from the Ministry of Education, Culture, Sports, Science, and Technology, and Industrial Technology Research Grant Program in 2002 from the New Energy and Industrial Technology Development Organization (NEDO) of Japan. T.U. gratefully acknowledges the fellowship of the “Special Postdoctoral Researchers Program” provided by RIKEN.


A new micropatterning technique based on photoinduced mass transport in a polymer film is presented. The Figure shows a rod-like dye crystallized aligned along a surface relief grating (SRG) on an azobenzene polymer film produced by photoirradiation through a photomask. The uniaxial alignment is achieved by one-dimensional diffusion—restricted by the grating geometry—of the dye molecule.