Conteduca, D.Khan, S.N.Martínez Ruiz, M.A.Bruce, G.D.Krauss, T.F.Dholakia, K.2024-08-132024-08-132023ACS Photonics, 2023; 10(12):4322-43282330-40222330-4022https://hdl.handle.net/2440/141886Near-field optics can overcome the diffraction limit by creating strong optical gradients to enable the trapping of nanoparticles. However, it remains challenging to achieve efficient, stable trapping without heating and thermal effects. Dielectric structures have been used to address this issue but usually offer weak trap stiffness. In this work, we exploit the Fano resonance effect in an all-dielectric quadrupole nanostructure to realize a 20- fold enhancement of trap stiffness, compared to the off-resonance case. This enables a high effective trap stiffness of 1.19 fN/nm for 100 nm diameter polystyrene nanoparticles with 4.2 mW/μm2 illumination. Furthermore, we demonstrate the capability of the structure to simultaneously trap two particles at distinct locations within the nanostructure array.en© 2023 The Authors. Published by American Chemical Society. This article is licensed under CC-BY 4.0optical trapping; Fano resonance effect; near-field enhancement; dielectric nanostructure; polystyrene nanoparticlesJournal article10.1021/acsphotonics.3c011262024-08-13679397Dholakia, K. [0000-0001-6534-9009]