摘要
制备了一种掺杂有机给体和受体分子的向列相液晶 (nematicliquidcrystals)材料。掺杂的给体和受体分子使液晶材料的光折变性能大为提高。用此材料做成的夹心器件进行了能量二波耦合、简并四波混频等实验。在外加低直流电场 (0 5kV/cm)条件下 ,观察到了光折变增益Γ为 44 1cm-1,二波能量耦合实验中观察到的衍射光束达到 6级 ,简并四波混频中最大衍射效率达到 5 8% 。
The orientational photorefractive effects were observed in nematic liquid crystals doped with electron donor and acceptor organic molecules. This kind of materials exhibits significantly their enhanced photorefractive performance. Two-beam coupling and four-wave mixing experiments are performed to characterize the photophysics of these novel materials. Polymer stabilization alters the charge transport and trapping characteristics of LCs, resulting in persistent lived gratings. Furthermore, the net photorefractive gain (Γ) of 441 cm-1 in two-beam coupling, and the diffraction efficiency of 58% in four-wave mixing were also measured.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2002年第3期266-271,共6页
Acta Optica Sinica
基金
国家自然科学基金 (6 98880 0 1
19834 0 30 )
