Plasmonic control of nonlinear two-photon absorption in graphene nanocomposites
Nonlinear two-photon absorption in a quantum dot–graphene nanoflake nanocomposite system has been investigated. An external laser field is applied to the nanocomposite to simultaneously observe two-photon processes in the quantum dot and excite localized surface plasmons in the graphene nanodisk. Th...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2013 |
| País: | España |
| Institución: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Idioma: | inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/34657 |
| Acceso en línea: | https://hdl.handle.net/20.500.14352/34657 |
| Access Level: | acceso abierto |
| Palabra clave: | 535 535.14 535.374 533.951 External laser fields Graphene nanocomposites Localized surface plasmon Nanocomposite systems Nonlinear optical applications Nonlinear optical process Plasmon resonance frequencies Two-photon absorptions Nonlinear Dynamics Quantum Dots Static Electricity Electromagnetismo Física de materiales Óptica (Física) 2202 Electromagnetismo 2209.19 Óptica Física |
| Sumario: | Nonlinear two-photon absorption in a quantum dot–graphene nanoflake nanocomposite system has been investigated. An external laser field is applied to the nanocomposite to simultaneously observe two-photon processes in the quantum dot and excite localized surface plasmons in the graphene nanodisk. This resonance condition can be achieved by tuning the plasmon resonance frequency in the graphene nanoflake via electrostatic gating. It is found that the strong local field of the graphene plasmons can enhance and control nonlinear optical processes in the quantum dot. Specifically, we show that the two-photon absorption coefficient in the quantum dot can be switched between single- and double-peaked spectra by modifying the graphene–quantum dot separation. Two-photon processes in the quantum dot can also be switched on or off by slightly changing the gate voltage applied to the graphene. Our findings indicate that this system can be used for nonlinear optical applications such as all-optical switching, biosensing and signal processing. |
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