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
- National Natural Science Foundation of China [61771172, 61401122]
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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