Investigation of plasmonic whispering-gallery mode characteristics for graphene monolayer coated dielectric nanodisks.
Opt Lett
; 39(19): 5527-30, 2014 Oct 01.
Article
en En
| MEDLINE
| ID: mdl-25360919
ABSTRACT
In this Letter, we theoretically studied high-quality (Q) factor plasmonic whispering-gallery modes (WGMs) with ultrasmall mode volumes in graphene monolayer coated semiconductor nanodisks in the mid-infrared range. The influence of the chemical potential, the relaxation time of graphene, and the radius of the nanodisk on the cavity Q factor and the mode volume was numerically investigated. The numerical simulations showed that the plasmonic WGMs excited in this cavity had a deep subwavelength mode volume of 1.4×10(-5)(λ(0)/2n)(3), a cavity Q factor as high as 266 at a temperature lower than 250 K, and, consequently, a large Purcell factor of â¼1.2×10(7) when the chemical potential and relaxation time were assumed to be 0.9 eV and 1.4 ps, respectively. The results provide a possible application of plasmonic WGMs in the integration of nano-optoelectronic devices based on graphene.
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1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Semiconductores
/
Nanoestructuras
/
Fenómenos Ópticos
/
Grafito
Idioma:
En
Revista:
Opt Lett
Año:
2014
Tipo del documento:
Article