Krimer D O, Residori S
Theoretische Physik, Universitaet Tuebingen, 72076 Tuebingen, Germany.
Eur Phys J E Soft Matter. 2007 May;23(1):77-82. doi: 10.1140/epje/i2006-10081-5. Epub 2007 May 24.
We show theoretically that thermomechanical effects in dye-doped nematic liquid crystals when illuminated by laser beams, can become important and lead to molecular reorientation at intensities substantially lower than that needed for optical Fréedericksz transition. We propose a 1D model that assumes homogenous intensity distribution in the plane of the layer and is capable to describe such a thermally induced threshold lowering. We consider a particular geometry, with a linearly polarized light incident perpendicularly on a layer of homeotropically aligned dye-doped nematics.
我们从理论上表明，当激光束照射时，染料掺杂向列型液晶中的热机械效应会变得很重要，并在强度远低于光学弗雷德里克兹转变所需强度的情况下导致分子重新取向。我们提出了一个一维模型，该模型假设层平面内强度分布均匀，并且能够描述这种热诱导的阈值降低。我们考虑一种特定的几何结构，即线偏振光垂直入射到一层垂直排列的染料掺杂向列型液晶上。
