Electrically tunable nonlinear plasmonics in graphene nanoislands

摘要: 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 small response of conventional materials. Metallic nanostructures partially alleviate this situation, as large light enhancement associated localized plasmons amplifies to record high levels. Graphene hosts long-lived, electrically tunable that also interact strongly light. Here we show polarizabilities graphene nanoislands can be tuned surpass several orders magnitude those metal nanoparticles similar size. This extraordinary behaviour extends over visible and near-infrared spectrum for islands consisting hundreds carbon atoms doped moderate carrier densities. Our quantum-mechanical simulations plasmon-enhanced nanographene reveal material an ideal platform development nanodevices.