title: Photonic Multitasking Interleaved Si Nanoantenna Phased Array.
abstract: Metasurfaces provide unprecedented control over light propagation by imparting local, space-variant phase changes on an incident electromagnetic wave. They can improve the performance of conventional optical elements and facilitate the creation of optical components with new functionalities and form factors. Here, we build on knowledge from shared aperture phased array antennas and Si-based gradient metasurfaces to realize various multifunctional metasurfaces capable of achieving multiple distinct functions within a single surface region. As a key point, we demonstrate that interleaving multiple optical elements can be accomplished without reducing the aperture of each subelement. Multifunctional optical elements constructed from Si-based gradient metasurface are realized, including axial and lateral multifocus geometric phase metasurface lenses. We further demonstrate multiwavelength color imaging with a high spatial resolution. Finally, optical imaging functionality with simultaneous color separation has been obtained by using multifunctional metasurfaces, which opens up new opportunities for the field of advanced imaging and display.
authors.affiliation: Geballe Laboratory for Advanced Materials, Stanford University , Stanford, California 94305, United States.|Department of Electrical Engineering, Stanford University , Stanford, California 94305, United States.
authors.forename: Dianmin
authors.initials: D
authors.lastname: Lin
authors.affiliation: Geballe Laboratory for Advanced Materials, Stanford University , Stanford, California 94305, United States.
authors.forename: Aaron L
authors.initials: AL
authors.lastname: Holsteen
authors.affiliation: Micro and Nanooptics Laboratory, Faculty of Mechanical Engineering and Russell Berrie Nanotechnology Institute, Technion-Israel Institute of Technology , Haifa 32000, Israel.
authors.forename: Elhanan
authors.initials: E
authors.lastname: Maguid
authors.affiliation: Department of Electrical Engineering, Stanford University , Stanford, California 94305, United States.
authors.forename: Gordon
authors.initials: G
authors.lastname: Wetzstein
authors.affiliation: CREOL, The College of Optics and Photonics, University of Central Florida , Orlando, Florida 32816, United States.
authors.forename: Pieter G
authors.initials: PG
authors.lastname: Kik
authors.affiliation: Micro and Nanooptics Laboratory, Faculty of Mechanical Engineering and Russell Berrie Nanotechnology Institute, Technion-Israel Institute of Technology , Haifa 32000, Israel.
authors.forename: Erez
authors.initials: E
authors.lastname: Hasman
authors.affiliation: Geballe Laboratory for Advanced Materials, Stanford University , Stanford, California 94305, United States.
authors.forename: Mark L
authors.initials: ML
authors.lastname: Brongersma
keywords: Metasurfaces; geometric phase; multifunctional optics; phased array antenna; spatial multiplexing