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Published on: February 25, 2017
Femtosecond Optical Annealing Induced Polymer Melting and Formation of Solid Droplets
Jinghui Yang1,2, Cuiying Huang3, Xinping Zhang4
1Institute of Information Photonics Technology and College of Applied Sciences, Beijing University of Technology, Beijing 100124, China. b201606021@emails.bjut.edu.cn.
Abstract:
Interaction between femtosecond laser pulses with polymeric thin films induced transient optical annealing of the polymer molecules. Melting of the polymer films took place during the transient annealing process, so that a solid-liquid-solid phase transition process was observed. Ultrafast cooling of the melting polymer produced solidified droplets. Microscopic and spectroscopic characterization revealed that the polymer molecules were rearranged with preferable H-aggregation to reach the lowest formation energy during the melting process. Intermolecular coupling was enhanced due to the modified molecular arrangement. This observation of melting of polymeric semiconductors due to the interaction with femtosecond light pulses is potentially important for better understanding laser-matter interactions and for exploring organic optoelectronic devices through special material processing.
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