基于等离激元多重杂化效应的光吸收结构

近年来,以聚合物为代表的高分子材料由于具有比其他光吸收材料(如半导体材料、碳基材料以及贵金属纳米材料)更好的柔性和粘弹性而受到广泛关注.本文基于等离子体再聚合技术和磁控溅射工艺在聚合物材料层上制备了具有等离激元多重杂化效应的光吸收结构,该结构具有宽谱高吸收特性.该结构的制备工艺简单易行,对不同聚合物材料具有通用性,在光学器件领域具有广泛的应用前景.

Light absorbing structures based on plasmon multi-hybrid effect

In recent years,the polymers represented by macromolecular materials have attracted widespread attention due to their higher flexibility and viscoelastic,compared with other materials used for light absorption(such as semiconductor materials,carbon-based materials and noble metal nanomaterials).Although the polymers have shown potential applications in the photothermal field,compared with other light-absorbing materials,the polymer substrates have a low light absorption rate and a narrow absorption bandwidth concentrated in the visible light band.Therefore,it is necessary to prepare a structure on the polymer material layer for absorbing light,thereby improving the ability of the polymer to absorb light.In addition,since the existing preparation processes of polymer absorption structures require the use of templates and the processes are relatively complicated,there is an urgent need for a simple and easy process to prepare the absorption structures on the polymer material layer.In this article,composite nanoforests are prepared on polymer substrates based on a plasma repolymerization technology and magnetron sputtering process;due to the metallic nanoparticles existing,multi-hybrid plasmonic effect is achieved,thus the average light absorption rate of the polymer in a wavelength range of 380–2500 nm is increased from 23.34%to 74.56%.Such polymer composite nanoforests have high absorption characteristics in a wide spectral range.The method of preparing the structure is quite simple,and can be applied to preparing different polymer materials.Besides,by changing the plasma bombardment time,the morphology of the nanoforests can be adjusted;by increasing the size of the metallic nanoparticles,the absorption of the composite nanoforests can be increased.It is foreseeable that the polymer composite nanoforests will have applications in various optical devices.