TY  - GEN
A1  - Jelken, Joachim
A1  - Santer, Svetlana
T1  - Light induced reversible structuring of photosensitive polymer films
T2  - Postprints der Universität Potsdam Mathematisch-Naturwissenschaftliche Reihe
N2  - In this paper we report on photoswitchable polymer surfaces with dynamically and reversibly fluctuating topographies. It is well known that when azobenzene containing polymer films are irradiated with optical interference patterns the film topography changes to form a surface relief grating. In the simplest case, the film shape mimics the intensity distribution and deforms into a wave like, sinusoidal manner with amplitude that may be as large as the film thickness. This process takes place in the glassy state without photo-induced softening. Here we report on an intriguing discovery regarding the formation of reliefs under special illumination conditions. We have developed a novel setup combining the optical part for creating interference patterns, an AFM for in situ acquisition of topography changes and diffraction efficiency signal measurements. In this way we demonstrate that these gratings can be “set in motion” like water waves or dunes in the desert. We achieve this by applying repetitive polarization changes to the incoming interference pattern. Such light responsive surfaces represent the prerequisite for providing practical applications ranging from conveyer or transport systems for adsorbed liquid objects and colloidal particles to generation of adaptive and dynamic optical devices.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 750 
KW  - surface-relief gratings
KW  - induced deformation
KW  - mass-transport
KW  - azobenzene elastomers
KW  - thin-films
KW  - birefringence
KW  - roughness
KW  - network
KW  - erasure
Y1  - 2019
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/43643
UR  - https://nbn-resolving.org/urn:nbn:de:kobv:517-opus4-436432
SN  - 1866-8372
IS  - 750
SP  - 20295
EP  - 20305
ER  -