title: Strong tunable absorption enhancement in graphene using dielectric-metal core-shell resonators.
abstract: We theoretically investigate light absorption by a graphene monolayer that is coated on the outside of dielectric-metal core-shell resonators (DMCSRs). We demonstrate that light absorption of graphene can be greatly enhanced in such multi-layered core-shell architectures as a result of the excitation of the hybridized bonding plasmon resonance supported by the DMCSRs. We also demonstrate that the absorption enhancement in graphene can be easily tuned over a wide range from the visible to the near-infrared, and particularly the enhancement factor can be optimally maximized at any selective wavelength, by simultaneously varying the dielectric core size and the metal shell thickness. Our results suggest that the graphene-wrapped DMCSRs with strong and highly wavelength-tunable absorption enhancement in graphene could be attractive candidates for applications in graphene-based photodetectors and image sensors.
authors.affiliation: School of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, China.
authors.forename: Mingjie
authors.initials: M
authors.lastname: Wan
authors.affiliation: Department of Mathematics and Physics, Zhengzhou Institute of Aeronautical Industry Management, Zhengzhou, 450015, China. lyfree2010@163.com.
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.affiliation: School of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, China.
authors.forename: Jiawei
authors.initials: J
authors.lastname: Chen
authors.affiliation: School of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, China.
authors.forename: Wenyang
authors.initials: W
authors.lastname: Wu
authors.affiliation: School of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, China. zchen@nju.edu.cn.|Collaborative Innovation Center of Advanced Microstructures, Nanjing, 210093, China. zchen@nju.edu.cn.
authors.forename: Zhuo
authors.initials: Z
authors.lastname: Chen
authors.affiliation: School of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, China.|Collaborative Innovation Center of Advanced Microstructures, Nanjing, 210093, China.
authors.forename: Zhenlin
authors.initials: Z
authors.lastname: Wang
authors.affiliation: School of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, China.|Collaborative Innovation Center of Advanced Microstructures, Nanjing, 210093, China.
authors.forename: Huitian
authors.initials: H
authors.lastname: Wang