Muñoz-Martínez J F, Jubera M, Matarrubia J, García-Cabañes A, Agulló-López F, Carrascosa M
Opt Lett. 2016 Jan 15;41(2):432-5. doi: 10.1364/OL.41.000432.
One- and two-dimensional diffractive optical devices have been fabricated by light-assisted trapping and patterning of nanoparticles. The method is based on the dielectrophoretic forces appearing in the vicinity of a photovoltaic crystal, such as Fe:LiNbO3, during or after illumination. By illumination with the appropriate light distribution, the nanoparticles are organized along patterns designed at will. One- and two-dimensional diffractive components have been achieved on X- and Z-cut Fe:LiNbO3 crystals, with their polar axes parallel and perpendicular to the crystal surface, respectively. Diffraction gratings with periods down to around a few micrometers have been produced using metal (Al, Ag) nanoparticles with radii in the range of 70-100 nm. Moreover, several 2D devices, such as Fresnel zone plates, have been also produced showing the potential of the method. The diffractive particle patterns remain stable when light is removed. A method to transfer the diffractive patterns to other nonphotovoltaic substrates, such as silica glass, has been also reported.
通过光辅助捕获和纳米颗粒图案化制备了一维和二维衍射光学器件。该方法基于在光照期间或之后，在诸如铁掺杂铌酸锂（Fe:LiNbO3）等光伏晶体附近出现的介电泳力。通过用适当的光分布进行照明，纳米颗粒沿着随意设计的图案排列。在X切割和Z切割的Fe:LiNbO3晶体上实现了一维和二维衍射元件，其极轴分别平行和垂直于晶体表面。使用半径在70 - 100纳米范围内的金属（铝、银）纳米颗粒制备出了周期低至约几微米的衍射光栅。此外，还制备了几种二维器件，如菲涅耳波带片，展示了该方法的潜力。当去除光照时，衍射颗粒图案保持稳定。还报道了一种将衍射图案转移到其他非光伏衬底（如石英玻璃）上的方法。
