Mie Metasurfaces with Multipole Resonances in the Lattice

Recently emerged high-index materials have been a subject of active studies in recent years. Ultra-thin optical elements can be engineered based on transdimensional photonic lattices that include 3D-designed nanoparticles supporting multipole resonances and arranged in 2D arrays to enhance collective effects in the nanostructure. Nanostructures with a high refractive index have been suggested as a promising alternative to conventional metals supporting plasmonic resonances. Here we show that the antennas made out of high-index material support several multipole resonances enabled by the supporting propagating modes with a high effective index and their reflection from the antenna boundaries. Different multipole resonances appear for the large nanoantenna, as well as a decrease of reflection from the nanoantenna array and highly directional resonant scattering. Transdimensional lattices consisting of resonant nanoantennas in the engineered periodic arrays have great potential to serve as functional elements in flat optical components and photonic devices.<br/>This work was performed, in part, at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science by Los Alamos National Laboratory (Contract 89233218CNA000001) and Sandia National Laboratories (Contract DE-NA-0003525). The work is also supported by Contract DE-2375849.