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▲ [9p-Z16-7] Stable Particle Clusters Trapped and Assembled Using a Plasmonic Nanotweezer Integrated on a Silicon Waveguide
Keywords:hybrid photonic-plasmonic devices, plasmonic nanotweezers, optical assembly
Recently, hybrid nanophotonic devices composed of both photonic and plasmonic elements have attracted a lot of interest for on-chip sensing, light emission, and quantum optics applications. [1,2] In this work, we report on the optical trapping, assembly, and self-organization of fluorescent polystyrene beads using plasmonic nanotweezers located on a silicon photonic waveguide. By resonantly exciting the plasmonic mode of a periodic chain of gold nanorods coupled to a silicon waveguide, [3,4] we achieve single particle trapping as well as particle cluster assembly.
Based on experimental observations and motion tracking analysis, we investigate the geometry, orientation, and stability of the self-organized bead clusters. Surprisingly, the orientation and stability of the clusters is found to greatly vary depending on the number and the configuration of the trapped beads. By analyzing of the trapped bead’s motion, we show that vacancy-free cluster topologies are the most stables. Our results evidence that the relief created by the waveguide at the surface of the sample and the resulting electrostatic potential barriers at the edges of the waveguide play a key role in the enhancement of the clusters’ stability.
Based on the observation and analysis of optically assembled clusters of polystyrene beads, our results show how stable vacancy-free clusters can be formed through the joint action of optical and electrostatic forces. This work paves the way for further development of plasmonic nanotweezers following a multiphysics approach.
REFERENCES
[1] Oliver Benson, Nature 480 (2011) 193.
[2] Jolly Xavier et al., Nanophotonics 7 (2018) 1.
[3] Mickaël Février et al., Nano Lett. 12 (2012) 1032.
[4] Giovanni Magno et al., Opt. Lett. 41 (2016) 3679.
Based on experimental observations and motion tracking analysis, we investigate the geometry, orientation, and stability of the self-organized bead clusters. Surprisingly, the orientation and stability of the clusters is found to greatly vary depending on the number and the configuration of the trapped beads. By analyzing of the trapped bead’s motion, we show that vacancy-free cluster topologies are the most stables. Our results evidence that the relief created by the waveguide at the surface of the sample and the resulting electrostatic potential barriers at the edges of the waveguide play a key role in the enhancement of the clusters’ stability.
Based on the observation and analysis of optically assembled clusters of polystyrene beads, our results show how stable vacancy-free clusters can be formed through the joint action of optical and electrostatic forces. This work paves the way for further development of plasmonic nanotweezers following a multiphysics approach.
REFERENCES
[1] Oliver Benson, Nature 480 (2011) 193.
[2] Jolly Xavier et al., Nanophotonics 7 (2018) 1.
[3] Mickaël Février et al., Nano Lett. 12 (2012) 1032.
[4] Giovanni Magno et al., Opt. Lett. 41 (2016) 3679.