Synthesis, crystal growth, and second-order nonlinear optical properties of new pyridinium salts

Jifeng Tan; Liang Li; Jianhong Yin; Xingfei Zhang; Xutang Tao; Zhou Yang

doi:10.1117/12.928450

11 October 2012 Synthesis, crystal growth, and second-order nonlinear optical properties of new pyridinium salts

Jifeng Tan, Liang Li, Jianhong Yin, Xingfei Zhang, Xutang Tao, Zhou Yang

Proceedings Volume 8474, Optical Processes in Organic Materials and Nanostructures; 847409 (2012) https://doi.org/10.1117/12.928450
Event: SPIE Organic Photonics + Electronics, 2012, San Diego, California, United States

Abstract

Three series of new organic pyridinium salt chromphores with high nonlinearities and crystal growth characteristics have been designed and synthesized through modifying the cations and counteranions. The chromophores with strong coulomb interactions to surpass the intermolecular interaction have been adopted to induce the non-centrosymmetric packing of molecules which is advantage to high macroscopic second-order optical nonlinearities. At the same time, heterocycle was introduced to substitute phenyl group of the DAS (4-N, N-dimethylamino-4′-N′-methyl-pyridinium tosylate) cation, which can form a series of new pyridinium-based chromophores to extend the molecular structure of NLO materials. Kurtz powder tests revealed that out of these pyridinium salts, the maximum powder second harmonic generation (SHG) efficiency is 1300 times of urea standard at the non-resonant wavelength of λ=2109 nm. The effect of heterocycle on the nonlinear properties and crystal growth abilities of the new developed materials have been studied. Single crystals were successfully obtained from methanol by slow cooling and evaporation methods. The reasons for considerably different macroscopic nonlinearities of these compounds have been explored in terms of intermolecular interactions.

Citation Download Citation

Jifeng Tan, Liang Li, Jianhong Yin, Xingfei Zhang, Xutang Tao, and Zhou Yang "Synthesis, crystal growth, and second-order nonlinear optical properties of new pyridinium salts", Proc. SPIE 8474, Optical Processes in Organic Materials and Nanostructures, 847409 (11 October 2012); https://doi.org/10.1117/12.928450

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