4.8 Article

High-Efficiency Metalenses with Switchable Functionalities in Microwave Region

期刊

ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 31, 页码 28423-28430

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b07102

关键词

metalenses; high efficiency; propagation phase; geometric phase; switchable functionality; microwave region

资金

  1. National Natural Science Foundation of China [61771172, 61401122]

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Regarding miniaturized and integrated systems, a single flat device that possesses diversified functionalities is highly desirable in optical to microwave regimes. With this perspective, bifunctional metalenses constructed by meta-atoms with integrated response to propagation phase and geometric phase are proposed for independent manipulation of right-handed and left-handed circularly polarized waves. The derived general criterion is verified in the microwave region from three bifunctional metalenses operating in transmission manner. The proof-of-concept measurements show that all these metalenses exhibit two independent functionalities that can be switched by flipping the helicity of the incident illumination. Very high efficiencies of around 80%, with peak value of 91%, are achieved by the ultrathin metasurfaces of thickness 0.15 lambda(0). The proposed metasurfaces provide a promising route for the realization of reconfigurable lenses and antennas in wireless communication systems.

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