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Electrically switchable and tunable infrared light modulator based on functional graphene metasurface
- Source :
- Nanophotonics. 12:1797-1807
- Publication Year :
- 2023
- Publisher :
- Walter de Gruyter GmbH, 2023.
-
Abstract
- Graphene is emerging as an ideal material for new-generation optoelectronic devices. In this paper, a novel graphene metasurface-based electrically switchable and tunable infrared light modulator has been proposed and theoretically studied. The functional modulator comprises a monolayer graphene sheet sandwiched in a Fabry–Perot (FP) like nanostructure consisting of a metal reflector, a dielectric spacer, and an ellipse patterned anisotropy antenna layer. As a result of the photon localization effect of the guided-mode resonance (GMR) in the FP structure, the graphene electroabsorption can be significantly enhanced to enable a high-performance light modulator. By fine-tuning the Fermi energy (E f) of graphene via controlling its bias-gate voltage, the proposed modulator can switch between a perfect absorber and a reflective polarization converter of high conversion efficiency (i.e., >90%) at 1550 nm. The conversion mechanism and the geometric dependences of the infrared light modulator have been investigated. We further demonstrated the tunability of the highly-efficient polarization converter over a broad spectrum by adjusting the real dispersion of E f. Our design concept provides an effective strategy for customizing novel optoelectronic devices by combining an electrically-tunable 2D material with a functional metasurface.
Details
- ISSN :
- 21928614
- Volume :
- 12
- Database :
- OpenAIRE
- Journal :
- Nanophotonics
- Accession number :
- edsair.doi...........492c1877a88d62b1849fc73011d541a1