Transmissive metasurfaces have provided an efficient platform to manipulate electromagnetic(EM)waves, but previously adopted multilayer meta-atoms are too thick and/or the design approach fully relies on brute-force s...Transmissive metasurfaces have provided an efficient platform to manipulate electromagnetic(EM)waves, but previously adopted multilayer meta-atoms are too thick and/or the design approach fully relies on brute-force simulations without physical understandings. Here, based on coupled-mode theory(CMT) analyses on multilayer meta-atoms of distinct types, it is found that meta-atoms of a specific type only allows the phase coverage over a particular range, thus suitable for polarization-control applications.However, combinations of meta-atoms with distinct types are necessary for building ultra-thin wavefront-control meta-devices requiring 360° phase coverage. Based on these physical understandings,high-efficiency meta-atoms are designed/fabricated, and used to construct three typical meta-devices,including quarter-and half-wave plates and a beam deflector. Our results elucidate the physics underlying the interplay between thicknesses and performances of transmissive metasurfaces, which can guide the realizations of miniaturized transmissive meta-devices in different frequency domains.展开更多
基金supported by National Key Research and Development Program of China(2017YFA0303500)the National Natural Science Foundation of China(11704240,11734007,and11674068)+3 种基金Natural Science Foundation of Shanghai(17ZR1409500 and 18QA1401800)Shanghai Science and Technology Committee(16JC1403100)Shanghai East Scholar PlanFudan University-CIOMP Joint Fund
文摘Transmissive metasurfaces have provided an efficient platform to manipulate electromagnetic(EM)waves, but previously adopted multilayer meta-atoms are too thick and/or the design approach fully relies on brute-force simulations without physical understandings. Here, based on coupled-mode theory(CMT) analyses on multilayer meta-atoms of distinct types, it is found that meta-atoms of a specific type only allows the phase coverage over a particular range, thus suitable for polarization-control applications.However, combinations of meta-atoms with distinct types are necessary for building ultra-thin wavefront-control meta-devices requiring 360° phase coverage. Based on these physical understandings,high-efficiency meta-atoms are designed/fabricated, and used to construct three typical meta-devices,including quarter-and half-wave plates and a beam deflector. Our results elucidate the physics underlying the interplay between thicknesses and performances of transmissive metasurfaces, which can guide the realizations of miniaturized transmissive meta-devices in different frequency domains.
