We present trial calculations of surface light-induced patterns in photochromic azo-substituted polymers. Using microscope with nanopositioning stage various birefringence and surface structures have been recorded in photochromic azo-functionalized polymers. By systematic approach to the inscription experiment and controlling cw or pulsed laser light intensity, its polarization and beam scan speed we observed the dynamics of molecular photoorientation and its relation to mass transport. We discuss properties of holographically inscribed polarization gratings and analyze them spatially by monitoring of microscopic local diffraction efficiency. We report how azo-benzene molecules can work in other systems, i.e. azobenzene functionalized POSS molecules embedded in nematic liquid crystal.
Organic nanocrystals (ONCs) similarly to inorganic ones show interesting size effects. It has been already observed that
their luminescence properties can be changed in terms of enhanced luminescence and spectral shift of fluorescence bands
as compared to bulk materials. Usually these effects are observed for much larger size of nanoparticles from 50 nm up to
1000 nm. Noncentrosymmetric and fluorescent organic crystals are rare but particularly interesting as they exhibit both
nonlinear optical properties like Second Harmonic Generation (SHG) and fluorescence. Such ONC's could serve as
fluorescent and SHG probes for bio-imaging purposes simultaneously. This could be beneficial for situation in which the
dynamics of ordering of biological systems has to be studied. Here, we report on 3-(1,1-dicyanoethenyl)-1-phenyl-4,5-
dihydro-1H-pyrazole (DCNP) compound which forms nanocrystals, exhibits large shifts of fluorescence maximum with
size and strong SHG signals. When embedded in polymeric or biopolymeric matrix DNA-CTMA shows efficient
amplified spontaneous emission. The unique properties of this compound in its various forms from molecules, ONC's to
macroscopic single crystals are studied and discussed.