Differential optical reflectivity (DOR) was used to study the temperature dependence of the short helical pitch in freestanding films of a liquid crystal compound. The experimentally measured DOR signal was fitted using Berremanâ€™s 4-4 matrix method to get the pitch value in the smectic- CÎ±* (Sm CÎ±*) phase. The results show continuous evolution of the pitch between the smectic- C* and Sm CÎ±* phases. In Sm CÎ±*, the pitch decreases as temperature increases and is found to level off at 16Â±1 smectic layers at the Sm CÎ±* to smectic- A* transition.
|Original language||English (US)|
|Journal||Physical Review E - Statistical, Nonlinear, and Soft Matter Physics|
|State||Published - 2006|