
1.Institute of BioEngineering, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
2.ICFO—Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels (Barcelona), Spain
3.ICREA—Institució Catalana de Recerca i Estudis Avançats, 08010 Barcelona, Spain
H Altug, Email: hatice.altug@epfl.ch
Published:2017-06,
Published Online:09 January 2017,
Received:19 April 2016,
Revised:03 January 2017,
Accepted:05 January 2017
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Rodrigo, D. et al. Double-layer graphene for enhanced tunable infrared plasmonics. Light: Science & Applications, 6, e16277 (2017).
Rodrigo, D. et al. Double-layer graphene for enhanced tunable infrared plasmonics. Light: Science & Applications, 6, e16277 (2017). DOI: 10.1038/lsa.2016.277.
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.
grapheneinfrarednanophotonicsoptoelectronicplasmonics
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