光诱导分布反馈激发染料掺杂向列相液晶的放大自发发射(英文)

Amplified Spontaneous Emission from a Dye-doped Nematic Liquid Crystal under Photo-induced Distributed Feedback Excitation

随着OLEDs的发展,有机/聚合物材料体系的放大自发发射也得到了广泛深入的研究。利用Lloyd镜面体系构建了分布反馈体系,研究了DCJTB在向列相液晶中的放大自发发射过程,利用布拉格方程计算了发射光谱的峰值波长。实验结果表明,DCJTB向列相液晶体系的放大自发发射阈值为与平面波导结构相比,分布反馈体系提供了良好的模式,半峰全宽明显变窄;随着电场的变化,不同角度的输出信号强度也变化明显,利用电场可以有效的对TE、TM两种模式的强度进行调制。

With the development of OLEDs, amplified spontaneous emission based on organic/polymer semiconductor materials have attracted a considerable amount of interest. We report the studies on ASE （ amplified spontaneous emission） in nematic liquid crystal waveguide doped with DCJTB （ 2- （1,1-dimethylethyl） -6 （ 2- （ 2,3,6,7- tetrabydro-1,1,7,7-tetramethyl-1-1 H ,5 H-benzo（ij） quinolizin-9-yl） ethenyl） -4 H-Pyran-4-ylidene） propanedinitrile） films utilizing a photo-induced distributed feedback （DFB） resonator, which is provided by two-beam interference using Lloyd mirror configuration. It is found that the full width at half maximum of the DFB resonator is much narrower than that of planar waveguide model. The effects of applied electric field on output intensity are also investigated at different observed angles. The output intensity of TE or TM model can be tuned by the external electric field.