title: Tunable terahertz reflection of graphene via ionic liquid gating.
abstract: We report a highly efficient tunable THz reflector in graphene. By applying a small gate voltage (up to ±3 V), the reflectance of graphene is modulated from a minimum of 0.79% to a maximum of 33.4% using graphene/ionic liquid structures at room temperature, and the reflection tuning is uniform within a wide spectral range (0.1-1.5 THz). Our observation is explained by the Drude model, which describes the THz wave-induced intraband transition in graphene. This tunable reflectance of graphene may contribute to broadband THz mirrors, deformable THz mirrors, variable THz beam splitters and other optical components.
authors.affiliation: Department of Electrical and Computer Engineering, National University of Singapore, 117576, Singapore. Centre for Advanced 2D Materials, National University of Singapore, 6 Science Drive 2, 117546 Singapore. Institute of Materials Research and Engineering (IMRE), 3, Research Link, 117602, Singapore.
authors.forename: Yang
authors.initials: Y
authors.lastname: Wu
authors.forename: Xuepeng
authors.initials: X
authors.lastname: Qiu
authors.forename: Hongwei
authors.initials: H
authors.lastname: Liu
authors.forename: Jingbo
authors.initials: J
authors.lastname: Liu
authors.forename: Yuanfu
authors.initials: Y
authors.lastname: Chen
authors.forename: Lin
authors.initials: L
authors.lastname: Ke
authors.forename: Hyunsoo
authors.initials: H
authors.lastname: Yang