In this study, a novel method is proposed for low-power trapping of nanoparticles that employs resonant bowtie nano-antennas, which generate high temperature gradients upon laser illumination. The approach involves the integration of the depletion attraction force and the near-field optical gradient force, which results in highly efficient trapping of small extracellular vesicles (EVs) and 100nm polystyrene beads with low power consumption (less than 5mW). Additionally, we demonstrate that rapid transport can be achieved in less than 10 seconds, facilitated by the long-range nature of the depletion attraction force.
We propose a platform that can transport, trap, and manipulate nanoscale particles using a combination of diffusiophoretic and near-field optical gradient forces. This platform operates with an anapole state under 532 nm laser illumination. The anapole antenna enhances the electromagnetic field through a slot that also makes the field accessible, and simultaneously operates as a nanoscale heat source to induce thermophoretic depletion of PEG, creating a diffusiophopretic force that delivers particles to the region of enhanced field for additional trapping by the optical gradient force. Our preliminary results have demonstrated transportation, agglomeration, and tweezing action of 300 nm particles in a 10% PEG solution.
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