Integrated super-couplers based on zero-index metamaterials

Abstract:

Zero-refractive-index metamaterials have been proposed as potential candidates for super-coupling applications, where light is confined to sub-diffraction limited length scales on-chip. Such a device allows for efficient coupling between disparate modes and compact 90 degree bends, which are challenging to achieve using dielectric waveguides. We discuss the simulation and fabrication results of all-dielectric on- chip zero-index metamaterial-based couplers. We observe transmission normal to all faces, regardless of the structure’s shape, highlighting an unexplored feature of zero index metamaterials for integrated photonics.