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Title: Antimatched Electromagnetic Metasurfaces for Broadband Arbitrary Phase Manipulation in Reflection

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.
Authors:
ORCiD logo [1] ;  [2] ;  [3]
  1. Foundation for Research & Technology-Hellas (FORTH), Crete (Greece)
  2. Ames Lab., Ames, IA (United States). Dept. of Physics and Astronomy
  3. Foundation for Research & Technology-Hellas (FORTH), Crete (Greece); Ames Lab., Ames, IA (United States). Dept. of Physics and Astronomy
Publication Date:
Report Number(s):
IS-J-9616
Journal ID: ISSN 2330-4022
Grant/Contract Number:
736876; AC02-07CH11358; 320081
Type:
Published Article
Journal Name:
ACS Photonics
Additional Journal Information:
Journal Volume: 5; Journal Issue: 3; Journal ID: ISSN 2330-4022
Publisher:
American Chemical Society (ACS)
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE; European Union (EU)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 36 MATERIALS SCIENCE; metasurfaces; metamaterials; multiple resonances; tunable; broadband; reflection; phase delay; group delay
OSTI Identifier:
1423697
Alternate Identifier(s):
OSTI ID: 1433662