Evidence for the applicability of a novel procedure (swelling–poling–deswelling) to produce a stable alignment of second order NLO-chromophores covalently attached to a cross-linked PMMA or polystyrene polymeric network

Cyclometalated 4-Styryl-2-phenylpyridine Platinum(II) Acetylacetonate Complexes as Second-Order NLO Building Blocks for SHG Active Polymeric Films

“…The second-order NLO coefficient matrix values d ij for poled films ( C ∞ v symmetry) were obtained by following the standard Maker fringe technique. , The SHG signal was normalized with respect to that of a calibrated quartz crystal wafer (X-cut) of 1 mm thickness whose d 11 value is 0.46 pm/V. In Table we present the d ij values calculated by fitting the Maker fringe measurements of the different polarizations: p → p, s → p, and 45 → s; the error in these data can be estimated as <20%.…”

Sequential photoisomerisation dynamics of the push-pull azobenzene Disperse Red 1

“…12,13 These factors, together with the large photo-induced structural change, determine the specific application profile for, e.g., tailored surface functionalisation, light-induced material deformation, surface-relief formation, nonlinear optics, or charge separation in organic photovoltaic and ferroelectric materials. 7,[14][15][16][17][18][19] DR1 is of particular practical interest because of its hydroxy group, which can be employed as a covalent linker, for example by functionalizing it with a methacrylate group for embedding in a polybutylmethacrylate (PBMA) matrix. 20 In contrast to plain AB, where the photoisomerisation mechanism is well studied, [21][22][23][24][25][26][27][28][29][30][31] the molecular dynamics of DR1 and related push-pull substituted ABs following excitation in the strong visible ππ*-type absorption band still remains controversial, despite several spectroscopic 32,33 and time-resolved 10,11,34,35 experimental studies and theoretical calculations.…”

Design of nickel donor–acceptor dithiolenes for 2nd order nonlinear optics: an experimental and computational study

“…The use of different polymeric matrices as polystyrene and polycarbonate having Tg below 200°C, or of a cross-linked polymeric network carrying covalently attached NLO chromophores, as well as introducing chiral substituents in the periphery of the molecule can be alternative strategies to achieve or improve the SHG response in the solid state. 54 These results, coupled with the high earth abundance and low cost production of nickel derivatives, make 3 an appealing 2 nd NLO candidate to be processed for further development as optical material with SHG properties. 1-3…”