Novel Organic Optical Devices Using Optical Poling

2003年，我们研究了基于基频（ω）和倍频（2ω）干涉光束辐照的全光极化在聚合物材料中诱导形成体积全息Χ^<(2)>光栅的新方法。被干涉光束偏振的样品在ω光束的照射下产生2ω的衍射光。结果表明，在聚合物材料中采用非共线全光极化制备了体积全息Χ^<(2)>光栅。2004年，我们首次报道了共轭化合物分子玻璃中Χ^<(2)>极化的全光极化现象。采用自旋铸造技术制备了1,4-双[2-[4-[N，N-二（对苯基）氨基]苯基]乙烯基]苯（BTAPVB）分子玻璃透明薄膜。BTAPVB中的偶极和八极组分有助于光诱导Χ^<(2)>极化的形成。Χ^<(2)>极化的生长速率与E_ω^4E_<2ω>具有良好的线性关系，说明在同一电子能级上双光子（ω+2ω）和三光子（ω+ω+ω）同时激发的过程有助于形成光致Χ^<(2)>极化。

In 2003, we investigated new approach of the formation of volume holographic Χ^<(2)> gratings induced in polymeric materials by an all-optical poling based on the irradiation of the interference beams between fundamental (ω) and frequency doubled (2ω) ones. The sample optically poled by the interference beams produced the diffracted 2ω light by the irradiation of ω beam. The result indicates that the volume holographic Χ^<(2)> gratings were fabricated by the non-collinear all optical poling in the polymeric materials.In 2004, we presented the first report on Χ^<(2)> polarization induced in molecular glass of conjugated compound by an all-optical poling. Transparent thin film of molecular glass of 1,4-bis[2-[4-[N,N-di(p-tolyl)amino]phenyl] vinyl]benzene (BTAPVB) was prepared using a spin-cast technique. Dipolar as well as octupolar components in BTAPVB contributed to the formation of photoinduced Χ^<(2)> polarization. Growth rate of Χ^<(2)> polarization has good linear relation with E_ω^4E_<2ω>, which suggested that the simultaneous processes of two-photon (ω+2ω) and three-photon (ω+ω+ω) excitation on the same electronic level contributed to the formation of photoinduced Χ^<(2)> polarization.