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Huygens’ metasurfaces based on congener dipole excitations
Physical Review Applied ( IF 4.532 ) Pub Date : 
Tianhua Feng, Alexander A. Potapov, Zixian Liang, and Yi Xu

Huygens’ metasurfaces provide a versatile and efficient platform for exotic wave manipulation. Conventional transmissive Huygens’ metasurfaces rely on the interference between different multipole excitations to minimize the undesired reflection, but the different nature between multipoles introduces challenge on the bandwidth and practical applications. Here, we reveal that in contrast to the conventional scheme, exciting congener dipoles within the same multipole catalogue is also possible to realize high-efficiency broadband Huygens’ metasurfaces for linearly polarized light. A theoretical model has been proposed and the required conditions for zero reflection and 2π phase variation have been derived in the dipole approximation. This model has been validated by a silicon dual-nanodisk metasurface, and the beam deflection and focusing functionalities have also been demonstrated with high efficiency and broadband properties.
更新日期:2020-01-16

 

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