Abstract

The irradiation of oligothiophene-doped liquid crystals (LCs) with a linearly polarized laser beam induces homeotropic-to-planar director reorientation. However, such molecular reorientation was explored only with a focused laser beam, which requires a lens and consequently limits their application. We report photoinduced molecular reorientation behavior of oligothiophene-doped LCs by irradiation with a collimated laser beam. We prepared the homeotropic aligned oligothiophene-doped LC and irradiated the sample with collimated and focused laser beams. As a result, the irradiation with a collimated beam induced molecular reorientation of LCs and its threshold intensity became lower than that of focused laser beam irradiation.

摘要

线性偏振激光束对低聚噻吩掺杂的液晶（LC）的辐照会引起垂直向平面的指向矢重取向。但是，这种分子的重新定向仅在聚焦激光束下进行，这需要透镜，因此限制了它们的应用。我们报告通过准直激光束照射光诱导寡聚噻吩掺杂的LCs的分子重取向行为。我们准备了垂直排列的低聚噻吩掺杂的液相色谱，并用准直和聚焦的激光束照射了样品。结果，准直光束的照射引起LC的分子重新取向及其阈值强度变得比聚焦激光束照射的低。