Abstract

Multifunctional planar systems that perform multiple concurrent tasks in a shared aperture have recently emerged in phased-array antennas for radar applications, and shared-aperture phased antenna arrays promise increased functionality in planar photonics as well. Effective control of a metasurface’s electromagnetic response, meanwhile, can be acquired through the geometric-phase mechanism, which enables spin-controlled phase modulation—the photon’s spin being associated with the intrinsic angular momentum of light. We have incorporated the shared-aperture phased-antenna-array concept and the geometric-phase mechanism, using spin-orbit interactions, to implement a multifunctional geometric-phase metasurface (GPM).

© 2016 Optical Society of America