Plasmonically enhanced light absorption in graphene nanoribbons
[ANGLÈS] Light absorption plays a crucial role in both optical detectors and photovoltaics. In order to improve the light absorption properties of materials different measures can be taken. This thesis considers light absorption of graphene in the mid infrared region of the electromagnetic spectrum....
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| Tipo de recurso: | tesis de maestría |
| Fecha de publicación: | 2012 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2099.1/16108 |
| Acceso en línea: | https://hdl.handle.net/2099.1/16108 |
| Access Level: | acceso abierto |
| Palabra clave: | Light absorption Nanostructures Optoelectronics photonics optical properties of nanostructures optics nanoestructuras - propiedades ópticas fotònica nanoestructures -- propietats òptiques òptica Absorció de la llum Nanoestructures Optoelectrònica Àrees temàtiques de la UPC::Enginyeria electrònica::Optoelectrònica |
| Sumario: | [ANGLÈS] Light absorption plays a crucial role in both optical detectors and photovoltaics. In order to improve the light absorption properties of materials different measures can be taken. This thesis considers light absorption of graphene in the mid infrared region of the electromagnetic spectrum. A numerical study of light absorption and of localized plasmons in nanostructured graphene is presented and discussed. We show that for nanostructured graphene in the mid infrared region of the spectrum light absorption can increase significantly due to plasmon resonances. We perform photocurrent measurements in graphene in the mid infrared region of the spectrum. We show the first proof of concept measurements showing photocurrent in the midinfrared from simple graphene devices. We find a photodetection responsivity of 10^-4 A/W in unpatterned graphene in the mid-infrared. |
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