TY  - JOUR
A1  - Henneberg, Oliver
A1  - Geue, Thomas
A1  - Saphiannikova, Marina
A1  - Pietsch, Ullrich
A1  - Rochon, Paul
T1  - X-ray and VIS light scattering from light-induced polymer gratings
Y1  - 2003
UR  - http://stacks.iop.org/0022-3727/36/A241
U6  - https://doi.org/10.1088/0022-3727/36/10A/350
ER  - 
TY  - JOUR
A1  - Henneberg, Oliver
A1  - Panzner, Tobias
A1  - Pietsch, Ullrich
A1  - Geue, Thomas
A1  - Saphiannikova, Marina
A1  - Rochon, Paul
A1  - Finkelstein, Kenneth D.
T1  - X-ray and VIS light scattering from light-induced polymer gratings
N2  - Sinusoidally shaped surface relief gratings made of polymer films containing, azobenzene moieties can be created by holographic illumination with laser light of about lambda approximate to 500 nm. The remarkable material transport takes place at temperatures far (100 K) below the glass transition temperature of the material. As probed by visible light scattering the efficiency of grating formation crucially depends on the polarization state of the laser light and is maximal when circular polarization is used. In contrast to VIS light scattering X-ray diffraction is most sensitive for periodic surface undulations with amplitudes below 10 nm. Thus, combined in-situ X-ray and visible light scattering at CHESS were used to investigate the dynamics of surface relief grating formations upon laser illumination. The time development of grating peaks up to 9th order at laser power of P = 20 mW/cm(2) could be investigated, even the onset of grating formation as a function of light polarization. A linear growth of grating amplitude was observed for all polarizations. The growth velocity is maximal using circularly polarized light but very small for s-polarized light
Y1  - 2004
UR  - 1960 = doi:10.1524/zkri.219.4.218.30438
SN  - 0044-2968
ER  - 
TY  - JOUR
A1  - Henneberg, Oliver
A1  - Geue, Thomas
A1  - Saphiannikova, Marina
A1  - Natansohn, Almeria
A1  - Rochon, Paul
A1  - Finkelstein, Kenneth D.
T1  - Investigation of material flow on inscribing a polymer surface grating probing X-ray and VIS light scattering
Y1  - 2002
SN  - 0927-7757
ER  - 
TY  - JOUR
A1  - Pietsch, Ullrich
A1  - Geue, Thomas
A1  - Henneberg, Oliver
A1  - Saphiannikova, Marina
T1  - X-ray investigations of formation efficiency of buried azobenzene polymer density gratings
Y1  - 2003
UR  - http://scitation.aip.org/journals/doc/JAPIAU-ft/vol_93/iss_6/3161_1.html
U6  - https://doi.org/10.1063/1.1554753
ER  - 
TY  - JOUR
A1  - Stiller, Burkhard
A1  - Karageorgiev, Peter
A1  - Geue, Thomas
A1  - Morawetz, Knut
A1  - Saphiannikova, Marina
A1  - Mechau, Norman
A1  - Neher, Dieter
T1  - Optically induced mass transport studied by scanning near-field optical- and atomic force microscopy
N2  - Some functionalised thin organic films show a very unusual property, namely the light induced material transport. This effect enables to generate three-dimensional structures on surfaces of azobenzene containing films only caused by special optical excitation. The physical mechanisms underlying this phenomenon have not yet been fully understood, and in addition, the dimensions of structures created in that way are macroscopic because of the optical techniques and the wavelength of the used light. In order to gain deeper insight into the physical fundamentals of this phenomenon and to open possibilities for applications it is necessary to create and study structures not only in a macroscopic but also in nanometer range. We first report about experiments to generate optically induced nano structures even down to 100 nm size. The optical stimulation was therefore made by a Scanning Near-field Optical Microscope (SNOM). Secondly, physical conditions inside optically generated surface relief gratings were studied by measuring mechanical properties with high lateral resolution via pulse force mode and force distance curves of an AFM
Y1  - 2004
SN  - 0204-3467
ER  -