1.Micro and Nanooptics Laboratory, Faculty of Mechanical Engineering, and Russell Berrie Nanotechnology Institute, Technion—Israel Institute of Technology, Haifa 32000, Israel
2.Geballe Laboratory for Advanced Materials, Stanford University, 476 Lomita Mall, Stanford, CA 94305, USA
Shared-aperture technology for multifunctional planar systems
performing several simultaneous tasks
was first introduced in the field of radar antennas. In photonics
effective control of the electromagnetic response can be achieved by a geometric-phase mechanism implemented within a metasurface
enabling spin-controlled phase modulation. The synthesis of the shared-aperture and geometric-phase concepts facilitates the generation of multifunctional metasurfaces. Here shared-aperture geometric-phase metasurfaces were realized via the interleaving of sparse antenna sub-arrays
forming Si-based devices consisting of multiplexed geometric-phase profiles. We study the performance limitations of interleaved nanoantenna arrays by means of a Wigner phase-space distribution to establish the ultimate information capacity of a metasurface-based photonic system. Within these limitations
we present multifunctional spin-dependent dielectric metasurfaces
and demonstrate multiple-beam technology for optical rotation sensing. We also demonstrate the possibility of achieving complete real-time control and measurement of the fundamental
intrinsic properties of light
including frequency
polarization and orbital angular momentum.
关键词
Keywords
geometric phasemetasurfacemultifunctionalshared aperturespectropolarimetryspin-opticsWigner distribution
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