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• W2621032257 endingPage "e16277" @default.
• W2621032257 startingPage "e16277" @default.
• W2621032257 abstract "Graphene is emerging as a promising material for photonic applications owing to its unique optoelectronic properties. Graphene supports tunable, long-lived and extremely confined plasmons that have great potential for applications such as biosensing and optical communications. However, in order to excite plasmonic resonances in graphene, this material requires a high doping level, which is challenging to achieve without degrading carrier mobility and stability. Here, we demonstrate that the infrared plasmonic response of a graphene multilayer stack is analogous to that of a highly doped single layer of graphene, preserving mobility and supporting plasmonic resonances with higher oscillator strength than previously explored single-layer devices. Particularly, we find that the optically equivalent carrier density in multilayer graphene is larger than the sum of those in the individual layers. Furthermore, electrostatic biasing in multilayer graphene is enhanced with respect to single layer due to the redistribution of carriers over different layers, thus extending the spectral tuning range of the plasmonic structure. The superior effective doping and improved tunability of multilayer graphene stacks should enable a plethora of future infrared plasmonic devices with high optical performance and wide tunability. Using multilayered stacks of graphene in place of highly doped single sheets makes it easier to tune plasmonic light-concentrating devices. The elevated dopant concentrations needed to generate surface plasmons in single-layer graphene cause problems with carrier mobility and stability. Daniel Rodrigo from the École Polytechnique Fédérale de Lausanne in Switzerland and colleagues fabricated double-layered graphene nanostructures and they found that its infrared plasmonic response exceeds that of a doped single sheet. By stacking the graphene layers to ensure low crystallographic overlap, each grapheme sheet retained its band structure and contributed to plasmon resonances. This set-up could be electrostatically biased to deliver much wider spectral tuning ranges than single graphene sheets. The team's theoretical analysis suggests that multilayered graphene stacks may offer even better plasmonic performance." @default.
• W2621032257 created "2017-06-09" @default.
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• W2621032257 date "2017-01-09" @default.
• W2621032257 modified "2023-10-12" @default.
• W2621032257 title "Double-layer graphene for enhanced tunable infrared plasmonics" @default.
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• W2621032257 doi "https://doi.org/10.1038/lsa.2016.277" @default.
• W2621032257 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6062234" @default.
• W2621032257 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30167262" @default.
• W2621032257 hasPublicationYear "2017" @default.
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