TY  - JOUR
A1  - Geue, Thomas
A1  - Schultz, Michael
A1  - Grenzer, Jörg
A1  - Natansohn, Almeria
A1  - Rochon, Paul
T1  - X-ray investigations of the molecular mobility with polymer surface gratings
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Pietsch, Ullrich
A1  - Rochon, Paul
A1  - Natansohn, Almeria
T1  - Formation of a buried lateral density grating in azopenzene polymer films
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Henneberg, Oliver
A1  - Chi, Li Feng
A1  - Geue, Thomas
A1  - Saphiannikova, Marina
A1  - Pietsch, Ullrich
A1  - Rochon, Paul
A1  - Natansohn, Almeria
T1  - Atomic force microscopy inspection of the early state of formation of polymer surface relief grating
Y1  - 2001
ER  - 
TY  - JOUR
A1  - Henneberg, Oliver
A1  - Geue, Thomas
A1  - Saphiannikova, Marina
A1  - Pietsch, Ullrich
A1  - Rochon, Paul
A1  - Natansohn, Almeria
T1  - Formation and dynamics of polymer surface relief gratings
Y1  - 2001
SN  - 0378-5963
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  - Geue, Thomas
A1  - Saphiannikova, Marina
A1  - Henneberg, Oliver
A1  - Pietsch, Ullrich
A1  - Rochon, Paul
A1  - Natansohn, Almeria
T1  - Formation mechanism and dynamics in polymer surface gratings
Y1  - 2002
ER  - 
TY  - JOUR
A1  - Geue, Thomas
A1  - Henneberg, Oliver
A1  - Grenzer, Jörg
A1  - Pietsch, Ullrich
A1  - Natansohn, Almeria
A1  - Rochon, Paul
A1  - Finkelstein, Kenneth D.
T1  - Formation of a buried density grating on thermal erasure of azobenzene polymer surface gratings
Y1  - 2002
SN  - 0927-7757
ER  - 
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  - Saphiannikova, Marina
A1  - Henneberg, Oliver
A1  - Gene, T. M.
A1  - Pietsch, Ullrich
A1  - Rochon, Paul
T1  - Nonlinear effects during inscription of azobenzene surface relief gratings
N2  - Surface relief gratings were inscribed on azobenzene polymer films using a pulselike exposure of an Ar+ laser. The inscription process was initiated by a sequence of short pulses followed by much longer relaxation pauses. The development of the surface relief grating was probed by a He-Ne laser measuring the scattering intensity of the first- order grating peak. The growth time of the surface relief grating was found to be larger than the length of the pulses used. This unusual behavior can be considered as a nonlinear material response associated with the trans-cis isomerization of azobenzene moieties. In this study the polymer stress was assumed to be proportional to the number of cis-isomers. One-dimensional viscoelastic analysis was used to derive the polymer deformation. The rate of trans-cis isomerization increases with the intensity of the inscribing light; in the dark it is equal to the rate of thermal cis- trans isomerization. The respective relaxation times were estimated by fitting theoretical deformation curves to experimental data
Y1  - 2004
SN  - 1520-6106
ER  -