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This content will become publicly available on February 27, 2019

Title: Photoexcited Graphene Metasurfaces: Significantly Enhanced and Tunable Magnetic Resonances

Artificially constructed metamaterials or metasurfaces with tailored resonant elements provide a revolutionary platform for controlling light at the subwavelength scale. Switchable or frequency-agile meta-devices are highly desirable in achieving more flexible functionalities and have been explored extensively by incorporating various materials, which respond to external stimuli. Graphene, a two-dimensional material showing extraordinary physical properties, has been found very promising for tunable meta-devices. However, the high intrinsic loss of graphene severely obstructs us from achieving high-quality resonance in various graphene metamaterials and metasurfaces, and the loss compensation can be considered as a straightforward strategy to take further advantages of enhanced light–graphene interactions. Here, we demonstrate that the photoexcited graphene, in which the quasi-Fermi energy of graphene changes corresponding to optical pumping, can boost the originally extremely weak magnetic resonance in a graphene split-ring metasurface, showing remarkable modulations in the transmission. In conclusion, our work pioneers the possibilities of optically pumped graphene metasurfaces for significant enhancement of resonances and feasible modulations.
ORCiD logo [1] ; ORCiD logo [2] ;  [1] ;  [3] ;  [4] ;  [2] ;  [1] ;  [1] ;  [4] ;  [5]
  1. Northwestern Polytechnical Univ., Xi'an (China)
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  3. Tsinghua Univ., Beijing (China)
  4. The Institute of Dongguan-Tongji Univ., Guangdong (China); Tongji Univ., Shanghai (China)
  5. Ames Lab. and Iowa State Univ., Ames, IA (United States); FORTH, Crete (Greece)
Publication Date:
Report Number(s):
Journal ID: ISSN 2330-4022
Grant/Contract Number:
Accepted Manuscript
Journal Name:
ACS Photonics
Additional Journal Information:
Journal Volume: 5; Journal Issue: 4; Journal ID: ISSN 2330-4022
American Chemical Society (ACS)
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
36 MATERIALS SCIENCE; gain; graphene plasmonics; loss compensation; magnetic resonance; surface conductivity; terahertz metamaterials
OSTI Identifier: