title: Tunable Terahertz Deep Subwavelength Imaging Based on a Graphene Monolayer.
abstract: The resolution of conventional terahertz (THz) imaging techniques is limited to about half wavelength, which is not fine enough for applications of biomedical sensing and nondestructive testing. To improve the resolution, a new superlens, constructed by a monolayer graphene sheet combining with a grating voltage gate, are proposed in this paper to achieve deep super-resolution imaging in the THz frequency range. The main idea is based on the Fabry-Perot resonance of graphene edge plasmon waves. By shaping the voltage gate into a radial pattern, magnified images of subwavelength targets can be obtained. With this approach, the finest resolution can achieve up to λ/150. Besides, the superlens can be conveniently tuned to work in a large frequency band ranging from 4.3 THz to 9 THz. The proposal could find potential applications in THz near-field imaging systems.
authors.affiliation: School of Electronics Engineering and Computer Science, Peking University, Beijing, 100871, China.
authors.forename: Heng-He
authors.initials: HH
authors.lastname: Tang
authors.affiliation: School of Electronics Engineering and Computer Science, Peking University, Beijing, 100871, China.
authors.forename: Tie-Jun
authors.initials: TJ
authors.lastname: Huang
authors.affiliation: School of Electronics Engineering and Computer Science, Peking University, Beijing, 100871, China.
authors.forename: Jiang-Yu
authors.initials: JY
authors.lastname: Liu
authors.affiliation: School of Electronics Engineering and Computer Science, Peking University, Beijing, 100871, China.
authors.forename: Yunhua
authors.initials: Y
authors.lastname: Tan
authors.affiliation: School of Electronics Engineering and Computer Science, Peking University, Beijing, 100871, China.
authors.forename: Pu-Kun
authors.initials: PK
authors.lastname: Liu