Optically Reconfigurable Graphene/Metal Metasurface on Fe:LiNbO3for Adaptive THz Optics

Jon Gorecki, Lewis Piper, Adnane Noual, Sakellaris Mailis, Nikitas Papasimakis, Vasilis Apostolopoulos

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We demonstrate, experimentally, nonvolatile optical control of terahertz metasurfaces composed of a metallic split-ring resonator array sandwiched between monolayer graphene and a photoconductive Fe:LiNbO3 substrate. We demonstrate frequency-selective tuning of THz transmission amplitude, and our results pave the way toward spatially resolved control of THZ metasurfaces for beam steering, imaging, and sensing applications. The substrate (Fe:LiNbO3) supports nonvolatile yet reversible photoinduced charge distributions, which locally modify the electrostatic environment of the nano-thickness graphene monolayer, altering the graphene electrical conductivity and therefore changing the resonance spectra of the metamaterial array. We present light-induced normalized transmittance changes up to 35% that are nonvolatile and persist after the illumination source is removed yet can be reversed by thermal annealing.

Original languageEnglish
Pages (from-to)9494-9501
Number of pages8
JournalACS Applied Nano Materials
Volume3
Issue number9
DOIs
Publication statusPublished - 25 Sep 2020

Keywords

  • 2D materials
  • lithium niobate
  • metamaterials
  • nonvolatile
  • plasmonic
  • terahertz
  • tunable

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