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High Efficiency and Quadratic Nonlinear Optical Properties of a Fully Optimized 2D Octupolar Crystal Characterized by Nonlinear Microscopy


  • This work is supported by a NRL grant, Creative Research Initiative Program (KISTEP), and KOSEF. SHL was supported by the BK21 scholarship. We thank Prof. H. Ito (Tohoku University, Japan) for having provided the DAST crystal, and Prof. J.-F. Roch for helpful discussions. Supporting Information is available online from Wiley InterScience of from the author.


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An octupolar crystal is produced from octupolar molecules of 1,3,5-tricyano-2,4,6-tris(p-diethylaminostyryl)benzene and its structure is elucidated experimentally using the combined polarization analysis of two-photon fluorescence and second-harmonic generation (SHG). The optimal crystalline packing of the molecules in the crystal (which originates from intermolecular π–π stacking interactions)—see Figure—results in a large SHG efficiency.

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