Determination Of The 2 1St Nontrivial Orientational Order Parameters In Lb Films Of Rod-Like Molecules By 3Rd-Order Sum Frequency Mixing
Title - Alternative
Chem. Phys. Lett.
Nonlinear Optical Susceptibilities; 3Rd-Harmonic Generation; Liquid-Crystal; Chemistry, Physical; Physics, Atomic, Molecular & Chemical
We demonstrate a new method for investigating orientational order in Langmuir-Blodgett films built from rod-like poly[bis(m-butoxyphenyl)silane] molecules. Two laser beams with different input frequencies omega1 and omega2 were collinearly overlapped to generate mixed light at the frequency 2omega1 + omega2 using all possible permutations of the beam polarizations. From the independent tensor components of chi(3)(-omega3; omega1, omega1, omega2) the first non-trivial in-plane order parameters C2 and C4 could be deduced with high accuracy. The orientational order could be well described by a two-dimensional diffusion model.
Chemical Physics Letters
Cha, M.; Neher, D.; Embs, F. W.; Mittlerneher, S.; and Stegeman, G., "Determination Of The 2 1St Nontrivial Orientational Order Parameters In Lb Films Of Rod-Like Molecules By 3Rd-Order Sum Frequency Mixing" (1993). Faculty Bibliography. 1740.