Multifunctional Plasmonic Film for Recording Near-Field Optical Intensity
Multifunctional Plasmonic Film for Recording Near-Field Optical Intensity
复制标题
DOI：
10.1021/nl501788a
复制
发表时间：
2014-08-01
期刊：
影响因子：
10.8
通讯作者：
Toussaint, Kimani C., Jr.
中科院分区：
文献类型：
--
作者：
Roxworthy, Brian J.;Bhuiya, Abdul M.;Toussaint, Kimani C., Jr.
我们证明了等离子体等效的照相胶片记录光强度在近场。等离子体激元结构是基于金领结纳米天线阵列上制造的二氧化硅柱。我们表明，它可以用于直接激光写入图像数据或记录光学矢量光束的偏振结构。扫描电子显微照片揭示了一个精心雕刻的曲率半径和高度的三角形组成的照明纳米天线，作为等离子体激元加热的结果，允许空间调谐的纳米天线的共振响应，而不牺牲其几何完整性。与使用嵌入在基质介质中的Au纳米棒的其他存储器专用方法相比，等离子体膜可以用于多个应用领域。为了证明这一功能，我们利用等离子体光学镊子的结构，并显示隔离的二氧化硅微粒到光写入的通道之间形成的暴露部分的膜。等离子体膜为光子应用提供了有趣的可能性，包括“无壁”的光流体通道，原位可定制的生化传感测定，以及近场粒子操纵和分选。
We demonstrate the plasmonic equivalent of photographic film for recording optical intensity in the near field. The plasmonic structure is based on gold bowtie nanoantenna arrays fabricated on SiO2 pillars. We show that it can be employed for direct laser writing of image data or recording the polarization structure of optical vector beams. Scanning electron micrographs reveal a careful sculpting of the radius of curvature and height of the triangles composing the illuminated nanoantennas, as a result of plasmonic heating, that permits spatial tunability of the resonance response of the nanoantennas without sacrificing their geometric integrity. In contrast to other memory-dedicated approaches using Au nanorods embedded in a matrix medium, plasmonic film can be used in multiple application domains. To demonstrate this functionality, we utilize the structures as plasmonic optical tweezers and show sequestering of SiO2 microparticles into optically written channels formed between exposed sections of the film. The plasmonic film offers interesting possibilities for photonic applications including optofluidic channels "without walls," in situ tailorable biochemical sensing assays, and near-field particle manipulation and sorting.