Tailored optical potentials for Cs atoms above waveguides with focusing dielectric nano-antenna

Abstract

Tuning the near-field using all-dielectric nanoantennae offers a promising approach for trapping atoms, which could enable strong singleatom/photon coupling. Here we report the numerical study of an optical trapping of single Cs atom above a waveguide with silicon nanoantenna which produces a trapping potential for atoms in a chip-scale configuration. Using counter-propagating incident fields, bichromatically detuned from the atomic cesium Dlines, we numerically investigate the dependence of the optical potential on the nanoantenna geometry. We tailor the near-field potential landscape by tuning the evanescent field of the waveguide using a toroidal nanoantenna, a configuration that enables trapping of ultracold Cs atoms. Our research opens up a plethora of trapping atoms applications in a chip-scale manner from quantum computing, to quantum sensing to list a few.