Optical metasurfaces have become versatile platforms for manipulating the phase,amplitude,and polarization of light.A platform for achieving independent control over each of these properties,however,remains elusive du...Optical metasurfaces have become versatile platforms for manipulating the phase,amplitude,and polarization of light.A platform for achieving independent control over each of these properties,however,remains elusive due to the limited engineering space available when using a single-layer metasurface.For instance,multiwavelength metasurfaces suffer from performance limitations due to space filling constraints,while control over phase and amplitude can be achieved,but only for a single polarization.Here,we explore bilayer dielectric metasurfaces to expand the design space for metaoptics.The ability to independently control the geometry and function of each layer enables the development of multifunctional metaoptics in which two or more optical properties are independently designed.As a proof of concept,we demonstrate multiwavelength holograms,multiwavelength waveplates,and polarization-insensitive 3D holograms based on phase and amplitude masks.The proposed architecture opens a new avenue for designing complex flat optics with a wide variety of functionalities.展开更多
基金support received from the Office of Naval Research under award N00014-18-1-2563the National Science Foundation under award ECCS-1351334support received from the National Science Foundation under award DMR-1410940.
文摘Optical metasurfaces have become versatile platforms for manipulating the phase,amplitude,and polarization of light.A platform for achieving independent control over each of these properties,however,remains elusive due to the limited engineering space available when using a single-layer metasurface.For instance,multiwavelength metasurfaces suffer from performance limitations due to space filling constraints,while control over phase and amplitude can be achieved,but only for a single polarization.Here,we explore bilayer dielectric metasurfaces to expand the design space for metaoptics.The ability to independently control the geometry and function of each layer enables the development of multifunctional metaoptics in which two or more optical properties are independently designed.As a proof of concept,we demonstrate multiwavelength holograms,multiwavelength waveplates,and polarization-insensitive 3D holograms based on phase and amplitude masks.The proposed architecture opens a new avenue for designing complex flat optics with a wide variety of functionalities.
