Electrically tunable nonlinear plasmonics in graphene nanoislands
Tipus de documentArticle
EditorNature Publishin group
Condicions d'accésAccés obert
Projecte de la Comissió EuropeaGRAPHENE - Graphene-Based Revolutions in ICT And Beyond (EC-FP7-604391)
GRASP - GRAPHENE-BASED SINGLE-PHOTON NONLINEAR OPTICAL DEVICES (EC-FP7-613024)
Nonlinear optical processes rely on the intrinsically weak interactions between photons enabled by their coupling with matter. Unfortunately, many applications in nonlinear optics are severely hindered by the small response of conventional materials. Metallic nanostructures partially alleviate this situation, as the large light enhancement associated with their localized plasmons amplifies their nonlinear response to record high levels. Graphene hosts long-lived, electrically tunable plasmons that also interact strongly with light. Here we show that the nonlinear polarizabilities of graphene nanoislands can be electrically tuned to surpass by several orders of magnitude those of metal nanoparticles of similar size. This extraordinary behaviour extends over the visible and near-infrared spectrum for islands consisting of hundreds of carbon atoms doped with moderate carrier densities. Our quantum-mechanical simulations of the plasmon-enhanced optical response of nanographene reveal this material as an ideal platform for the development of electrically tunable nonlinear optical nanodevices.
CitacióGarcia de Abajo, Francisco Javier; Cox, Joel D. Electrically tunable nonlinear plasmonics in graphene nanoislands. "Nature Communications", 11 Desembre 2014, vol. 5, núm. 5725.
Versió de l'editorhttp://www.nature.com/ncomms/2014/141211/ncomms6725/full/ncomms6725.html