Fujii Ryuta, Guo Jinxin, Klepp Jürgen, Pruner Christian, Fally Martin, Tomita Yasuo
Opt Lett. 2014 Jun 15;39(12):3453-6. doi: 10.1364/OL.39.003453.
We demonstrate twofold enhancement of the saturated refractive index modulation (Δn(sat)) recorded in a photopolymerizable nanoparticle-acrylate polymer composite film by incorporating thiols acting as chain transfer agents. The chain transfer reaction of thiols with (meth)acrylate monomer reduces the polymer crosslinking density and facilitates the mutual diffusion of nanoparticles and monomer during holographic exposure. These modifications provide increased density modulations of nanoparticles and the formed polymer, resulting in the enhancement of Δn(sat) as high as 1.6×10(-2) at a wavelength of 532 nm. The incorporation of thiols also leads to shrinkage suppression and to improvement of the grating's spatial frequency response. Such simultaneous improvement is very useful for holographic applications in light and neutron optics.
我们证明，通过加入用作链转移剂的硫醇，在可光聚合的纳米颗粒 - 丙烯酸酯聚合物复合膜中记录的饱和折射率调制（Δn(sat)）提高了两倍。硫醇与（甲基）丙烯酸酯单体的链转移反应降低了聚合物交联密度，并在全息曝光期间促进了纳米颗粒与单体的相互扩散。这些改性增加了纳米颗粒和形成的聚合物的密度调制，导致在532 nm波长下Δn(sat)提高至高达1.6×10(-2)。硫醇的加入还导致收缩抑制和光栅空间频率响应的改善。这种同时的改善对于光和中子光学中的全息应用非常有用。
