Light Trapping and Directional Scattering in Hybrid Metasurfaces

We design and analyze the optical response of subwavelength layered disk nanoresonators. The hybrid plasmonic / high-index dielectric nanoresonators allow for efficient light trapping and directional scattering. We investigate the scattering response of the layered nanoresonators array, and we show that varying the nanoresonator height leads to the realization of strong electromagnetic mode confinement resulting in a high-quality (Q) factor. We then demonstrate that strongly coupled electromagnetic modes in the nanostructure can interfere destructively in the surrounding medium of the nanostructure, inducing bound states in the continuum (BIC) for the modes excited in the nanostructure. Finally, we report on the observation of overlapping of electric and magnetic dipole moments giving rise to the suppression of electromagnetic waves either in the forward or backward directions.<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.