TY  - GEN
A1  - Di Florio, Giuseppe
A1  - Bründermann, Erik
A1  - Yadavalli, Nataraja Sekhar
A1  - Santer, Svetlana
A1  - Havenith, Martina
T1  - Polarized 3D Raman and nanoscale near-field optical microscopy of optically inscribed surface relief gratings
BT  - chromophore orientation in azo-doped polymer films
N2  - We have used polarized confocal Raman microspectroscopy and scanning near-field optical microscopy with a resolution of 60 nm to characterize photoinscribed grating structures of azobenzene doped polymer films on a glass support. Polarized Raman microscopy allowed determining the reorientation of the chromophores as a function of the grating phase and penetration depth of the inscribing laser in three dimensions. We found periodic patterns, which are not restricted to the surface alone, but appear also well below the surface in the bulk of the material. Near-field optical microscopy with nanoscale resolution revealed lateral two-dimensional optical contrast, which is not observable by atomic force and Raman microscopy.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 247 
KW  - glass-transition temperature
KW  - holographic diffraction gratings
KW  - chain azobenzene polymers
KW  - molecular-reorientation
KW  - amorphous polymers
KW  - data-storage
KW  - thin-films
KW  - dye
KW  - photoisomerization
KW  - alignment
Y1  - 2013
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-95233
SP  - 1544
EP  - 1554
ER  - 
TY  - GEN
A1  - Schönborn, Jan Boyke
A1  - Hartke, Bernd
T1  - Photochemical dynamics of E-methylfurylfulgide
BT  - kinematic effects on photorelaxation dynamics of furylfulgides
N2  - With the present theoretical study of the photochemical switching of E-methylfurylfulgide we contribute an important step towards the understanding of the photochemical processes in furylfulgide-related molecules. We have carried out large-scale, full-dimensional direct semiempirical configuration-interaction surface-hopping dynamics of the photoinduced ring-closure reaction. Simulated static and dynamical UV/Vis-spectra show good agreement with experimental data of the same molecule. By a careful investigation of our dynamical data, we were able to identify marked differences to the dynamics of the previously studied E-isopropylfurylfulgide. With our simulations we can not only reproduce the experimentally observed quantum yield differences qualitatively but we can also pinpoint two reasons for them: kinematics and pre-orientation. With our analysis, we thus offer straightforward molecular explanations for the high sensitivity of the photodynamics towards seemingly minor changes in molecular constitution. Beyond the realm of furylfulgides, these insights provide additional guidance to the rational design of photochemically switchable molecules.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 237 
KW  - decay dynamics
KW  - fulgides
KW  - implementation
KW  - molecular-dynamics
KW  - photoinduced nonadiabatic dynamics
KW  - photoisomerization
KW  - ring-closure
KW  - semiempirical methods
KW  - spectroscopy
KW  - state
Y1  - 2013
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-94516
SP  - 2483
EP  - 2490
ER  -