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• W2781475111 abstract "Metasurfaces impart phase discontinuities on impinging electromagnetic waves that are typically limited to 0–2π. Here, we demonstrate that multiresonant metasurfaces can break free from this limitation and supply arbitrarily large, tunable time delays over ultrawide bandwidths. As such, ultrathin metasurfaces can act as the equivalent of thick bulk structures by emulating the multiple geometric resonances of three-dimensional systems that originate from phase accumulation with effective material resonances implemented on the surface itself via suitable subwavelength meta-atoms. We describe a constructive procedure for defining the required sheet admittivities of such metasurfaces. Importantly, the proposed approach provides an exactly linear phase response so that broadband pulses can experience the desired group delay without any distortion of the pulse shape. We focus on operation in reflection by exploiting an antimatching condition, satisfied by interleaved electric and magnetic Lorentzian resonances in the surface admittivities, which completely zeroes out transmission through the metasurface. As a result, the proposed metasurfaces can perfectly reflect a broadband pulse imparting a prescribed group delay. The group delay can be tuned by modifying the implemented resonances, thus opening up diverse possibilities in the temporal applications of metasurfaces." @default.
• W2781475111 created "2018-01-12" @default.
• W2781475111 creator A5000738770 @default.
• W2781475111 creator A5029406795 @default.
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• W2781475111 date "2018-01-03" @default.
• W2781475111 modified "2023-10-18" @default.
• W2781475111 title "Antimatched Electromagnetic Metasurfaces for Broadband Arbitrary Phase Manipulation in Reflection" @default.
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• W2781475111 doi "https://doi.org/10.1021/acsphotonics.7b01415" @default.
• W2781475111 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5865077" @default.
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