Determination of polar anchoring energy of dye-doped liquid crystals by measuring capacitance
Determination of polar anchoring energy of dye-doped liquid crystals by measuring capacitance
复制标题
通过测量电容测定染料掺杂液晶的极性锚定能
DOI：
10.1063/1.3436587
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
Chia‐Rong Lee
中科院分区：
文献类型：
--
作者：
Chia;Zuo Zhong Cheng;K. Lo;Chia‐Rong Lee
染料掺杂液晶 (DDLC) 单元的极性锚定能是根据容量测量确定的。实验结果表明，在泵浦光束照射下，极性锚定能（7.90×10−6 J/m2）包括吸附引起的锚定能（5.74×10−6 J/m2）和预先存在的染料引起的锚定能（2.16×10−6 J/m2）。后者归因于扭矩，该扭矩甚至在照射之前就由边界表面上的染料分子引起。照射后，吸附诱导的锚定能仍然存在，而预先存在的染料诱导的锚定能消失，前者揭示弱锚定影响DDLC电池的衰减时间和阈值电压。此外，绘制 DDLC 单元中的极角分布揭示了其与 DDLC 单元电容变化的相关性。
Polar anchoring energy of a dye-doped liquid crystal (DDLC) cell is determined based on capacity measurements. Experimental results indicate that under the illumination of a pump beam, the polar anchoring energy (7.90×10−6 J/m2) includes the adsorption-induced anchoring energy (5.74×10−6 J/m2) and the preexisting-dye-induced anchoring energy (2.16×10−6 J/m2). The latter is attributed to the torque, which is induced by the dye molecules on the boundary surface even before illumination. After the illumination, the adsorption-induced anchoring energy remains and the preexisting-dye-induced anchoring energy disappears, with the former revealing that weak anchoring affects the decay time and threshold voltage of the DDLC cell. Moreover, plotting the polar angle distributions in the DDLC cell reveals its correlation with variations in the capacitance of the DDLC cell.