title: Critical coupling with graphene-based hyperbolic metamaterials.
abstract: In order to effectively realize and control the critical coupling, a graphene-based hyperbolic metamaterial has been proposed to replace the absorbing thin film in the critically coupled resonance structure. Our calculations demonstrate that the critical coupling effect (near-perfect light absorption) can be achieved at the near-infrared wavelength by using this layered structure, while the critical coupling frequency can be tuned by varying the Fermi energy level of graphene sheets via electrostatic biasing. Moreover, we show that the critical coupling frequency can be tuned by changing the thickness of the dielectric or layer number of the graphene sheets in the unit cell of the graphene-dielectric HMM. The optimization performance has also been indicated, which may offer an opportunity towards the experimental designs of high efficient graphene based critical coupling devices.
authors: 1] School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798 [2] SZU-NUS Collaborative Innovation Centre for Optoelectronic Science & Technology, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China [3].
authors: Yuanjiang
authors: Y
authors: Xiang
authors: 1] SZU-NUS Collaborative Innovation Centre for Optoelectronic Science & Technology, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China [2].
authors: Xiaoyu
authors: X
authors: Dai
authors: 1] School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798 [2] Key Laboratory for Micro-/Nano-Optoelectronic Devices of Ministry of Education, College of Physics and Microelectronic Science, Hunan University, Changsha 410082, China.
authors: Jun
authors: J
authors: Guo
authors: SZU-NUS Collaborative Innovation Centre for Optoelectronic Science & Technology, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
authors: Han
authors: H
authors: Zhang
authors: Key Laboratory for Micro-/Nano-Optoelectronic Devices of Ministry of Education, College of Physics and Microelectronic Science, Hunan University, Changsha 410082, China.
authors: Shuangchun
authors: S
authors: Wen
authors: School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798.
authors: Dingyuan
authors: D
authors: Tang