High Performance Graded Rainbow Holograms via Two-Stage Sequential Orthogonal Thiol–Click Chemistry
作者:Haiyan Peng、Devatha P. Nair、Benjamin A. Kowalski、Weixian Xi、Tao Gong、Chen Wang、Michael Cole、Neil B. Cramer、Xiaolin Xie、Robert R. McLeod、Christopher N. Bowman
DOI:10.1021/ma500167x
日期:2014.4.8
initiated by flood illumination of the sample, holographic materials with high Tg, high modulus, diffraction efficiency as high as 82%, and refractive index modulation of 0.004 were obtained. Graded rainbow holograms that displayed colors from blue to red at a single viewing angle were readily formed through this new technique.
进行正交的,连续的“点击”反应,以产生具有记录全息数据能力的新型聚合物基材。进行碱催化的巯基丙烯酸酯迈克尔“点击”反应,得到可写的,阶段1的聚合物基材,玻璃化转变温度(T g)为0到-26°C,橡胶态储能模量(E)为11.1到1。 0.3兆帕 松散交联的基体还包含新型高折射率单体9-(2,3-双(烯丙氧基)丙基)-9 H-咔唑(BAPC)不参与硫醇-迈克尔反应,但允许在随后暴露于相干激光束并引发自由基介导的硫醇-烯反应后在网络内形成较大的指数梯度。记录的全息光栅的衍射效率为96%,约为。在405 nm曝光下2 s内的光敏度为2.4 cm / mJ,强度为20 mW / cm 2。之后图案形成,经由硫醇-烯丙基“点击”由样品的泛光照射,具有高全息材料引发光聚合Ť克获得了高模量,高达82%的衍射效率和0.004的折射率调制。通过这种新技术可以轻松形成在单个视角下显示从蓝色到红色的渐变彩虹全息图。