Gorecki, Jonathan, Piper, Lewis Kieran, Noual, Adnane, Mailis, Sakellaris, Papasimakis, Nikitas and Apostolopoulos, Vasileios (2020) Optically reconfigurable graphene/metal metasurface on Fe:LiNbO3 for adaptive THz optics. ACS Applied Nano Materials, 3 (9), 9494-9501. (doi:10.1021/acsanm.0c02243).
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.
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- Current Faculties > Faculty of Engineering and Physical Sciences > School of Physics and Astronomy > Quantum, Light and Matter Group
School of Physics and Astronomy > Quantum, Light and Matter Group - Current Faculties > Faculty of Engineering and Physical Sciences > Zepler Institute for Photonics and Nanoelectronics > Nanophotonics Group
Zepler Institute for Photonics and Nanoelectronics > Nanophotonics Group - Current Faculties > Faculty of Engineering and Physical Sciences > School of Physics and Astronomy
School of Physics and Astronomy
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