Molecular Size Dependence in Third Order Susceptibility of Evaporated Tin-Phthalocyanine Thin Film

Molecular size dependence in third order optical susceptibility χ(3) for evaporated tin-phthalocyanine thin film was examined by methods of a scanning electron microscope technique (SEM) and an optical third harmonic generation (THG) Maker-fringe technique. Evaporated molecular size influenced greatly the values of χ(3). The thicker molecular size grew, the greater values of χ(3) were. The values were greater with increasing the order orientation OA= A⊥/(A⊥+AII), whose preferential direction was parallel to the major axis of microcrystals.