title: Light driving force for surface patterning on azobenzene-containing polymers.
abstract: In this paper, we investigated the effect of light driving force induced surface deformation on azobenzene-containing polymers. The surface deformation is attributed to light-induced mass migration inside the polymers. Circular cap arrays are firstly fabricated by high power laser ablation via polarization controlled three-beam interference. The circular caps are subsequently exposed to polarization controlled two-beam interfering field. The results illuminate that when the interfering laser beams are both set to P polarization, the circular caps are deformed. While the laser beams are of other interfering modes like (S, S) and (+45° , -45°), the caps are seldom deformed. The circular caps are also exposed to single intensity-homogeneous linearly polarized laser beam. The deformation of the caps keeps the same direction as the irradiating polarization. A model based on the focusing effect of the circular caps is addressed to explain the origin of the light driving force for mass migration in azopolymers. The all-optical approach for the production of deformed caps can be used to generate aspherical lens, which may be applied to many domains.
authors.affiliation: Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230027, China. huangjit@mail.ustc.edu.cn
authors.forename: Jintang
authors.initials: J
authors.lastname: Huang
authors.forename: Stefan
authors.initials: S
authors.lastname: Beckemper
authors.forename: Si
authors.initials: S
authors.lastname: Wu
authors.forename: Jing
authors.initials: J
authors.lastname: Shen
authors.forename: Qijin
authors.initials: Q
authors.lastname: Zhang
authors.forename: Keyi
authors.initials: K
authors.lastname: Wang
authors.forename: Arnold
authors.initials: A
authors.lastname: Gillner