Longitudinal anisotropy of the photoinduced molecular migration in azobenzene polymer films.
The effects of tightly focused, higher-order laser beams on the photoinduced molecular migration and surface deformations in azobenzene polymer films are investigated. We demonstrate that the surface relief is principally triggered by longitudinal fields, i.e., electric fields polarized along the optical axis of the focused beam. Our findings can be explained by the translational diffusion of isomerized chromophores when the constraining effect of the polymer-air interface is considered.
Laboratoire de Nanotechnologie et d'Instrumentation Optique, CNRS FRE 2671, de Technologie de Troyes, 12 rue Marie Curie, BP 2060 Troyes, France.
Yann
Y
Gilbert
Renaud
R
Bachelot
Pascal
P
Royer
Alexandre
A
Bouhelier
Gary P
GP
Wiederrecht
Lukas
L
Novotny