title: A single-dipole model of surface relief grating formation on azobenzene polymer films.
abstract: A new model that keeps track of the dynamics of single dipoles is suggested for the photoinduced formation of a surface relief grating on azobenzene polymer films by two optical fields. Interfering optical fields provide a single dipole of an azobenzene molecule with two dynamical resources: rotation of the molecule caused by the torque, leading to an induced dipole, and its subsequent migration because of the electric force. Explicit development of the induced dipole of the molecule and its real-time migration, which depend on the details of the optical fields such as polarization and wavelength, can be understood self-consistently within the model.
authors.affiliation: School of Materials Science, Japan Advanced Institute of Science and Technology, Ishikawa 923-1292, Japan.
authors.forename: Jae-Dong
authors.initials: JD
authors.lastname: Lee
authors.forename: Mi-Jeong
authors.initials: MJ
authors.lastname: Kim
authors.forename: Tomonobu
authors.initials: T
authors.lastname: Nakayama