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Double-layer graphene for enhanced tunable infrared plasmonics

查看全文 作　　者：Daniel [1]Rodrigo;Andreas [1]Tittl;Odeta [1]Limaj;F Javier García de [2,3]Abajo;Valerio [2,3]Pruneri;Hatice [1]Altug 高影响力作者 机构地区：[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-InstitucióCatalana de Recerca i Estudis Avançats,08010 Barcelona,Spain高影响力机构 出　　处：《Light(Science & Applications)》索引2017年第6卷第1期,共8页高影响力期刊 基　　金：the European Union Seventh Framework Programme under grant agreements no.625673 GRYPHON,no.604391;European Union H2020 Programme under grant agreement no.696656 Graphene Flagship;financial support from the Swiss National Science Foundation through project no.133583,NATO’s Public Diplomacy Division in the framework of‘Science for Peace’,European Union’s Horizon 2020 research and innovation program under grant agreement no.644956,FundacióPrivada Cellex,AGAUR 2014 SGR 1400 and 1623;the Spanish Ministry of Economy and Competitiveness(grants SEV-2015-0522 and MAT2014-59096-P);the‘Fondo Europeo de Desarrollo Regional’(FEDER)through grant TEC2013-46168-R。 摘　　要：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. 关 键 词：GRAPHENE INFRARED NANOPHOTONICS OPTOELECTRONIC PLASMONICS
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