Third order nonlinear optical properties of 4-N, N-dimethylamino-4’N’-methyl- stibazolium iodide (DMSI) single crystal

An organic single crystal 4-N,N-dimethylamino-4’-N’-methylstilbazolium iodide (DMSI) which has high third order optical nonlinearity was successfully grown by slow solvent evaporation technique at room temperature. The grown single crystal was subjected to different characterization analyses to find out its suitability for device fabrication. The single crystal X-ray diffraction (XRD) and powder XRD analyses confirmed the crystal structure. This compound was characterized by functional groups analyses using CHN and proton NMR spectrum. It is evident from the optical absorption study that the crystal has excellent transmission in the entire visible region with its lower cut off wavelength is around 572 nm. The thermal stability of the compound was determined by thermal analyses of the specimen. The electrical properties of the crystal are investigated by ac, dc and photoconductivity measurements.