Dynamic multiple nanoparticle trapping using metamaterial plasmonic tweezers
Dynamic multiple nanoparticle trapping using metamaterial plasmonic tweezers
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DOI：
10.1063/5.0032846
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发表时间：
2021-01-11
影响因子：
4
通讯作者：
Chormaic, Sile Nic
中科院分区：
文献类型：
--
作者：
Kotsifaki, Domna G.;Truong, Viet Giang;Chormaic, Sile Nic
光学操纵由于其通用性和非侵入性而引起了人们的极大兴趣。然而，传统的光学捕获在纳米世界中仍然效率低下。近年来，等离子体激元的出现在克服衍射限制和对高捕获激光功率的要求方面带来了革命性的变化。在基于近场光阱腔的系统中，Fano谐振光镊具有强大的捕获能力。在这项工作中，我们实验证明顺序捕获20纳米粒子通过使用超材料等离子体光镊。我们研究了在低和高入射激光强度下，通过测量各种陷阱结构的陷阱刚度来实现多重陷阱。我们的等离子体配置可以用作光驱动的纳米级分选装置在低激光激发下。我们的研究结果提供了一种替代方法，可以在不同的热点捕获多个纳米颗粒，从而实现在纳米尺度上控制质量传输的方法。
Optical manipulation has attracted remarkable interest owing to its versatile and noninvasive nature. However, conventional optical trapping remains inefficient in the nanoscopic world. The emergence of plasmonics in recent years has brought a revolutionary change in overcoming limitations due to diffraction and the requirements for high trapping laser powers. Among the near-field optical trapping cavity-based systems, Fano-resonant optical tweezers have a robust trapping capability. In this work, we experimentally demonstrate sequential trapping of 20nm particles through the use of metamaterial plasmonic optical tweezers. We investigate the multiple trapping via trap stiffness measurements for various trapping configurations at low and high incident laser intensities. Our plasmonic configuration could be used as a light-driven nanoscale sorting device under low laser excitation. Our results provide an alternative approach to trap multiple nanoparticles at distinct hotspots, enabling ways to control mass transport on the nanoscale.