Frontiers in Physics (Jul 2020)
Polarization-Insensitive Reflective Metasurfaces for Highly Efficient Generation of OAM Beams
Abstract
The polarization-insensitive reflective metasurfaces constructed from hexagonal-ring units along with honeycomb lattice are proposed for the efficient generation of converged orbital angular momentum (OAM) waves. The proposed unit has a very succinct structure constructed from a hexagonal-ring patch along with a hexagonal metallic reflector, which could achieve a polarization-insensitive response to the incident waves, when binding further with the hexagonal lattice. Through the topology optimization of the unit arrangement, two reflective metasurfaces stimulating the first-order and the second-order OAM beams are numerically designed, which may find useful in radio communications and radar applications.
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