Electric-field frequency dependence of Pockels coefficients in 2-amino-5-nitropyridium dihydrogen phosphate organic–inorganic crystals

Abstract

The electro-optic and dielectric properties of organic-inorganic 2-amino-5-nitropyridium dihydrogen phosphate crystals were measured near room temperature at a wavelength of 632.8 nm and as a function of an electric-field f requency t hat v aried f rom 1 k Hz t o 4 0 M Hz. T he f requency d ispersion o f t he e lectro-optic coefficients and their comparison with the second-harmonic generation coefficients showed that the largest part of the electro-optic properties is electronic in origin (whereas the piezo-optic contribution is small). Results reveal a large anisotropy of the ionic and electronic contributions that is related to the contributions of the organic molecule to nonlinear polarizability.

Synthesis, crystal growth and characterization of a new organic NLO material: Caffeinium picrate (CAFP)—A charge transfer molecular complex salt

“…However, the ease of growth, simplicity of the technique, the less cumbersome procedures involved coupled with the economic friendly facet have won acclaims for the formation of salts over the methodologies mentioned above. The various organic sub-networks induce noncentrosymmetry in the bulk and enhance the thermal and mechanical stabilities through hydrogen bonding interactions [12,13].…”

Structural and microhardness studies of a NLO material–bisthiourea cadmium chloride

“…Materials with large second-order optical nonlinearities, lower cutoff wavelength and stable physicochemical performance are needed in order to realize many of the photonics and optoelectronic applications [1,2]. During the last several years, according to the idea of combining the inorganic distorted polyhedron with the asymmetric conjugate organic molecules [3], semiorganic materials have been attracting a great deal of attention in the NLO field, because such materials have the potential for combining the high optical nonlinearity and chemical flexibility of organics with temporal and thermal stabilities and excellent transmittance of inorganics.…”

Growth and Characterization of Benzimidazolium Salicylate: NLO Property from a Centrosymmetric Crystal

“…But some of the recent reports of organic molecular complexes like caffenium picrate [5], picolinium maleate [6], guanidinium trifluoroacetate, and so forth have highlighted that even centrosymmetric crystals possess SHG effect due to the presence of delocalized electron system linking donor and acceptor groups which enhance the necessary asymmetric polarizability [7,8]. The various organic subnetworks enhance the thermal and mechanical stabilities through hydrogen bonding interactions and behave as noncentrosymmetry material in the bulk [9,10]. In organic molecular charge transfer complexes, the charge transfer interaction and molecular aggregation through intermolecular hydrogen bonding has been entrenched by single crystal XRD analysis [11,12].…”