Open AccessMicrowave realization of multiresonant metasurfaces for achromatic pulse delay
Author(s) -
Odysseas Tsilipakos,
Lei Zhang,
Maria Kafesaki,
Costas M. Soukoulis,
Thomas Koschny
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2015/1/012157
Subject(s) - group delay and phase delay , broadband , achromatic lens , resonator , realization (probability) , optics , microwave , physics , reflection (computer programming) , phase (matter) , pulse (music) , dispersion (optics) , photonics , optoelectronics , amplitude , true time delay , reflection coefficient , antenna (radio) , computer science , telecommunications , bandwidth (computing) , statistics , mathematics , quantum mechanics , detector , programming language , phased array
We propose a microwave realization of a metasurface that can delay broadband pulses without distortion in reflection. In order to obtain large and broadband pulse delay, we harness the synergetic phase delay of five sharply-resonant meta-atoms. More specifically, three electric-LC and two split ring resonators, supporting electric and magnetic dipole resonances, respectively, are combined in a subwavelength unit cell. The resonances are spectrally interleaved and specifically designed to provide a spectrally-constant reflection amplitude and group delay according to the prescription in [ACS Photonics 5, 1101, 2018]. The designed metasurface is electrically ultrathin (λ 0 /19), since it relies on resonant phase delay exclusively, instead of phase accumulation via propagation. We show delay of 700-MHz Gaussian pulses centred at 11 GHz by 1.9 ns, corresponding to approximately 21 carrier cycles. Our results highlight the practical potential of metasurfaces for broadband dispersion control applications.