arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.08769physics.opticsphysics.app-ph
收藏

基于连通纳米环孔的等离子体子钳

Plasmonic tweezers based on connected nanoring apertures

Theodoros D. Bouloumis, Domna G. Kotsifaki, Xue Han, Sile Nic Chormaic, Viet Giang Truong

摘要:

利用光学力操纵微粒已经在生命科学和物理科学中得到了许多应用。为了扩展光学捕获对纳米政权,在这项工作中,我们证明了捕获单个纳米粒子的阵列中的等离子体同轴纳米孔与各种内部磁盘配置和理论上估计相关的力量。对于20 nm聚苯乙烯颗粒,在980 nm的捕获波长下,对于149 nm的纳米盘直径的最佳设计观察到3.50fN/nm/mW的高归一化实验陷阱刚度。理论模拟被用来解释所观察到的陷阱刚度的增强。在14 $\times$ × 10 $^{11}$粒子/ml的浓度下,在0.59 mW/ $μ$ m $^{2}$的低入射激光强度下,获得小于8秒的快速粒子捕获时间。这种良好的捕获性能与纳米粒子的快速递送到多个捕获位点出现从增强的电磁近场和空间温度增加的组合。这项工作在纳米粒子的输送和捕获具有高精度的应用,并弥合光学操纵和纳米流体之间的差距。

英文摘要:

The manipulation of microparticles using optical forces has led to many applications in the life and physical sciences. To extend optical trapping towards the nano-regime, in this work we demonstrate trapping of single nanoparticles in arrays of plasmonic coaxial nano-apertures with various inner disk configurations and theoretically estimate the associated forces. A high normalised experimental trap stiffness of 3.50fN/nm/mW for 20nm polystyrene particles is observed for an optimum design of 149nm for the nanodisk diameter at a trapping wavelength of 980nm. Theoretical simulations are used to interpret the enhancement of the observed trap stiffness. A quick particle trapping time of less than 8sec is obtained at a concentration of 14$\times$10$^{11}$ particles/ml with low incident laser intensity of 0.59mW/$μ$m$^{2}$. This good trapping performance with fast delivery of nanoparticles to multiple trapping sites emerges from a combination of the enhanced electromagnetic near-field and spatial temperature increase. This work has applications in nanoparticle delivery and trapping with high accuracy, and bridges the gap between optical manipulation and nanofluidics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑