Morphology, Linear and Nonlinear Optical Response of Octopolar Chromophores Embedded in a Silica Sonogel Matrix

作者：Torres Zuniga V^*; Morales Saavedra O G; Hennrich G; Flores Flores J O; Ortega Martinez R

来源：Molecular Crystals and Liquid Crystals, 2010, 527: 1-11.

DOI：10.1080/15421406.2010.485547

• Hybrid materials
• liquid crystals
• octopolar compounds
• optical properties
• sol-gel

In this work, a liquid crystalline octopolar molecule 1,3,5-tris(ethynylphenyl)benzene-(1) was successfully embedded as dopant chromophore within a SiO2 based sonogel network in order to prepare stable solid state hybrid materials with intense second harmonic generation (SHG). This recently synthesized octopolar compound exhibit a centrosymmetric C3-symmetry structure, which is constituted by an electron-rich core and electron-poor periphery groups. The sonogel method, induced by energetic ultrasonic (US) waves applied at the TEOS/H2O reactant mixture interface has proven to be a suitable route in the manufacture of monolithic hybrid systems suitable for optical characterizations. The octopolar-based hybrid samples were comprehensively studied in their morphology, spectroscopic, linear and second-order nonlinear optical (NLO) properties, according to several characterization techniques: epimicroscopy, AFM, UV-Vis- and fluorescence (PL) spectroscopies, and the NLO-SHG-technique. Epimicroscopy, photoluminiscent and absorption spectra evidence an optimal and homogeneous inclusion of the octopolar compounds within the glassy sonogel network. Without necessity of molecular poling processes, the effective quadratic-NLO susceptibility [image omitted] of the hybrid was estimated to 13.6x10-3pm/V at 1064nm by SHG-transmission experiments recorded far-off of the resonance regime.

• 出版日期2010