| 초록 |
Photoisomerization of azobenzene molecules that are incorporated into polymer chains leads to the bulk mass transfer, and consequently, surface reliefs are generated. In this study, we demonstrate that unusual surface reliefs were spontaneously produced merely by the single-step irradiation of interference patterns, under specific conditions. In particular, unusual surface reliefs exhibited that two sets of sinusoidal gratings with different grating vectors and periods were hierarchically structured on azopolymer films. Main gratings were developed from the interference induced bulk mass transfer as expected, whereas the additional gratings were derived from creeping and aggregation of azopolymers. This work can open new path toward understanding of azopolymer motion as well as the fabrication of novel complex surface reliefs. |
