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Keywords:

  • directional photofluidization lithography;
  • azopolymers;
  • polarization-dependence;
  • hierarchical surface-relief gratings
Thumbnail image of graphical abstract

The structural features of monolithically ordered, hierarchical surface reliefs can be deterministically controlled by localized or co-operative holographic photofluidization of azopolymer. The observations of morphological evolution, presented by Seungwoo Lee, Jung-Ki Park, and co-workers on page 4412, address a long-standing problem: the origin of holography-induced surface relief grating formation onto azopolymer film in terms of azopolymeric photoflows and directional photofluidization.