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Abstract:

The present work deals with a theoretical research on the emission and radiation properties of a dipole emitter source close to a dimer graphene plasmonic antenna. Modification of the radiation and the quantum efficiencies resulting from varying the position of the emitter and the orientation of its dipole moment are calculated by using a rigorous electromagnetic method based on Green's second identity. Large enhancements in the emission and the radiation of the emitter occur due to the coupling with the antenna surface plasmons in the spectral region from ≈4 THz to ≈15 THz. Our results show that the radiation efficiency can be enhanced by four orders of magnitude and that the quantum efficiency reaches values close to 0.8 when the emission frequency coincides with one of the resonant dipolar frequencies. On the other hand, these quantities can be reduced in a great measure at a specific frequency for a given emitter location. We present calculations of the near–field distribution and the far field intensity which reveal the role of the plasmonic antenna resonance in the emitter enhanced radiation. We show that the spectral region where the radiation is enhanced can be chosen over a wide range by varying the chemical potential of graphene from 0.2eV to 1eV. © 2018 Elsevier Ltd

Registro:

Documento: Artículo
Título:Theoretical investigation of the spontaneous emission on graphene plasmonic antenna in THz regime
Autor:Cuevas, M.
Filiación:Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) and Facultad de Ingeniería y Tecnología Informática, Universidad de Belgrano, Villanueva 1324, Buenos Aires, C1426BMJ, Argentina
Grupo de Electromagnetismo Aplicado, Departamento de Física, FCEN, Universidad de Buenos Aires and IFIBA, Ciudad Universitaria, Pabellón I, Buenos Aires, C1428EHA, Argentina
Palabras clave:42.25.Fx; 73.20.Mf; 78.68.+m; 81.05.ue; Graphene; Spontaneous emission; Surface plasmon; Antennas; Dimers; Directional patterns (antenna); Efficiency; Graphene; Plasmonics; Radiation; Spontaneous emission; Surface plasmons; Terahertz waves; 42.25.Fx; 73.20.Mf; 78.68.+m; 81.05.ue; Electromagnetic methods; Specific frequencies; Theoretical investigations; Theoretical research; Quantum efficiency
Año:2018
Volumen:122
Página de inicio:216
Página de fin:227
DOI: http://dx.doi.org/10.1016/j.spmi.2018.08.006
Título revista:Superlattices and Microstructures
Título revista abreviado:Superlattices Microstruct
ISSN:07496036
CODEN:SUMIE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07496036_v122_n_p216_Cuevas

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Citas:

---------- APA ----------
(2018) . Theoretical investigation of the spontaneous emission on graphene plasmonic antenna in THz regime. Superlattices and Microstructures, 122, 216-227.
http://dx.doi.org/10.1016/j.spmi.2018.08.006
---------- CHICAGO ----------
Cuevas, M. "Theoretical investigation of the spontaneous emission on graphene plasmonic antenna in THz regime" . Superlattices and Microstructures 122 (2018) : 216-227.
http://dx.doi.org/10.1016/j.spmi.2018.08.006
---------- MLA ----------
Cuevas, M. "Theoretical investigation of the spontaneous emission on graphene plasmonic antenna in THz regime" . Superlattices and Microstructures, vol. 122, 2018, pp. 216-227.
http://dx.doi.org/10.1016/j.spmi.2018.08.006
---------- VANCOUVER ----------
Cuevas, M. Theoretical investigation of the spontaneous emission on graphene plasmonic antenna in THz regime. Superlattices Microstruct. 2018;122:216-227.
http://dx.doi.org/10.1016/j.spmi.2018.08.006