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Seven at One Blow: Particle Cluster Stability in a Single Plasmonic Trap on a Silicon Waveguide
ACS Photonics ( IF 7 ) Pub Date : 2020-07-15 , DOI: 10.1021/acsphotonics.0c00637
Christophe Pin 1, 2 , Giovanni Magno 3 , Aurore Ecarnot 3 , Emmanuel Picard 2 , Emmanuel Hadji 2 , Vy Yam 3 , Frédérique de Fornel 1 , Béatrice Dagens 3 , Benoît Cluzel 1
Affiliation  

Relying on localized surface plasmons, plasmonic nanotweezers enable trapping and handling nanoparticles in the near-field of nanoscale optical hotspots. In this work, we uncover new functionalities offered by plasmonic nanotweezers integrated in hybrid photonic–plasmonic platforms. Using a periodic chain of gold nanorods coupled to a silicon photonic waveguide, we demonstrate the optical trapping of single dielectric nanobeads as well as the formation of well-defined self-assembled nanobead clusters. Based on experimental observations and particle tracking analysis, we measure the trapping efficiency and analyze the statistical trends of the clusters’ topology and stability. We demonstrate that vacancy-free cluster configurations composed of four and seven beads benefit from an enhanced stability thanks to the concomitant actions of both the optical forces and the bead–waveguide electrostatic interactions. This effect could enable further optimization of integrated plasmonic nanotweezers for efficient particle assembly and manipulation at the nanoscale in future lab-on-a-chip applications.

中文翻译:

一击七:硅波导上单个等离子阱中的粒子簇稳定性

依靠局部表面等离激元,等离激元纳米镊子可以在纳米级光学热点的近场中捕获和处理纳米粒子。在这项工作中,我们发现了集成在光子-等离子混合平台中的等离子纳米镊子所提供的新功能。使用耦合到硅光子波导的金纳米棒的周期性链,我们证明了单电介质纳米珠的光阱捕获以及定义良好的自组装纳米珠簇的形成。基于实验观察和粒子跟踪分析,我们测量了捕集效率并分析了簇的拓扑和稳定性的统计趋势。我们证明了由四个和七个磁珠组成的无空位簇结构得益于增强的稳定性,这要归功于光学力和磁珠-波导静电相互作用的共同作用。这种效果可以使集成的等离激元纳米镊子进一步优化,以在未来的芯片实验室应用中实现纳米级的高效粒子组装和操作。
更新日期:2020-08-19
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