Determination of the two first non-trivial orientational order parameters in LB films of rod-like molecules by third-order sum frequency mixing
✍ Scribed by M. Cha; D. Neher; F.W. Embs; S. Mittler-Neher; G. Stegeman
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 684 KB
- Volume
- 202
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
We demonstrate a new method for investigating orientational order in Langmuir-Blodgett films built from rod-like poly [ bis (mbutoxyphenyl)silane] molecules. Two laser beams with different input frequencies w, and wq were collinearly overlapped to generate mixed light at the frequency 201, + co2 using all possible permutations of the beam polarizations. From the independent tensor components of,$3) ( -wj; w,, w,, oz) the first non-trivial in-plane order parameters C, and C, could be deduced with high accuracy. The orientational order could be well described by a two-dimensional diffusion model.