Optical pulling force on dielectric particles via metallic slab surface plasmon excitation: a comparison between transmission and reflection schemes

FERRARI, HERNÁN; HERRERO, VICTOR; CUEVAS, MAURO

OPTICS LETTERS

OPTICAL SOC AMER

Año: 2023

0146-9592

In this letter, a simple structure formed by a metallic thinlayer covering a high index substrate is used to designan optical tweezer. Owing to the interaction betweenthe field scattered by the particle with an incident planewave and the proposed structure, a pulling or attractivecomponent of the optical force emerges. This compo-nent results enhanced thanks to the surface plasmons(SPs) excitation arising from the elliptical polarizationof the induced dipole moment on the particle. To fur-ther exploit the versatility of the proposed approach, weanalyze two basic configurations: the reflection scheme,for which the plane wave impinges from the side wherethe particle is placed, and the transmission scheme, forwhich the incidence is made from the substrate side.Our results show that the intensity of the pulling forcein the reflection scheme and for finite thickness metallayer reaches values exceeding more than twice thoseprovided by a single metallic interface. We also demon-strate that the transmission scheme is more favourablethan the reflection scheme for enhancing pulling forceintensities. Our contribution can be valuable for re-alizing simple plasmonic schemes for improving thepulling force via interactions between the nano-particleand SP fields. (PDF) Optical pulling force on dielectric particles via metallic slab surface plasmon excitation: a comparison between transmission and reflection schemes. Available from: https://www.researchgate.net/publication/369777194_Optical_pulling_force_on_dielectric_particles_via_metallic_slab_surface_plasmon_excitation_a_comparison_between_transmission_and_reflection_schemes [accessed Apr 11 2023].