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We present sequential trapping and positioning of 20 nm polystyrene particles into an array configuration by using metamaterial plasmonic tweezers. The polystyrene nanoparticles suspended into a heavy water solution were trapped on adjacent plasmonic hotspots with a very low excitation power of 3.8 mW, creating a large trap stiffness of about 3.5 fN/nm. This high trapping stiffness kept the particles trapped into the nanocavities’ hotspots achieving almost 80% occupancy of the excited hotspots.
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Theodoros Bouloumis, Domna G. Kotsifaki, Sile Nic Chormaic, "Fast trapping and positioning of multiple polystyrene nanoparticles in a metamaterial plasmonic array," Proc. SPIE PC12436, Complex Light and Optical Forces XVII, PC124360A (17 March 2023); https://doi.org/10.1117/12.2649684