title: Investigation of plasmonic whispering-gallery mode characteristics for graphene monolayer coated dielectric nanodisks.
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 ∼1.2×10(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.
authors.forename: Jing
authors.initials: J
authors.lastname: Zhao
authors.forename: Weibin
authors.initials: W
authors.lastname: Qiu
authors.forename: Yixin
authors.initials: Y
authors.lastname: Huang
authors.forename: Jia-Xian
authors.initials: JX
authors.lastname: Wang
authors.forename: Qiang
authors.initials: Q
authors.lastname: Kan
authors.forename: Jiao-Qing
authors.initials: JQ
authors.lastname: Pan
mesh_terms: D006108:Graphite / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D055620:Optical Phenomena; D012666:Semiconductors
chemical_list: D006108:Graphite