Exceptional bi-step switching of quadratic nonlinear optical properties in a one-dimensional channel compound.

作者: Sijie Liu , Zhihua Sun , Chengmin Ji , Lina Li , Sangen Zhao

DOI: 10.1039/C7CC02625K

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摘要: We report a new solid-state nonlinear optical switch based on one-dimensional channel compound NH4[(CH3)4N]SO4·H2O. It shows an exceptional bi-step switching of second harmonic generation (SHG) effects, corresponding to its SHG-Off, SHG-Low and SHG-High states, which originate from two-step structural transitions with unique centrosymmetric–polar–chiral symmetry transformations.

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