title: Tunable mid-infrared coherent perfect absorption in a graphene meta-surface.
abstract: Graphene has drawn considerable attention due to its intriguing properties in photonics and optoelectronics. However, its interaction with light is normally rather weak. Meta-surfaces, artificial structures with single planar function-layers, have demonstrated exotic performances in boosting light-matter interactions, e.g., for absorption enhancement. Graphene based high efficiency absorber is desirable for its potential applications in optical detections and signal modulations. Here we exploit graphene nanoribbons based meta-surface to realize coherent perfect absorption (CPA) in the mid-infrared regime. It was shown that quasi-CPA frequencies, at which CPA can be demonstrated with proper phase modulations, exist for the grapheme meta-surface with strong resonant behaviors. The CPA can be tuned substantially by merging the geometric design of the meta-surface and the electrical tunability of graphene. Furthermore, we found that the graphene nanoribbon meta-surface based CPA is realizable with experimentally achievable graphene sample.
authors.affiliation: Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education and Department of Applied Physics, School of Science, Northwestern Polytechnical University, Xi'an 710129, China.
authors.forename: Yuancheng
authors.initials: Y
authors.lastname: Fan
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Zhe
authors.initials: Z
authors.lastname: Liu
authors.affiliation: Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education and Department of Applied Physics, School of Science, Northwestern Polytechnical University, Xi'an 710129, China.
authors.forename: Fuli
authors.initials: F
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Zhao
authors.affiliation: Key Laboratory of Advanced Micro-structure Materials (MOE) and School of Physics Science and Engineering, Tongji University, Shanghai 200092, China.
authors.forename: Zeyong
authors.initials: Z
authors.lastname: Wei
authors.affiliation: Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education and Department of Applied Physics, School of Science, Northwestern Polytechnical University, Xi'an 710129, China.
authors.forename: Quanhong
authors.initials: Q
authors.lastname: Fu
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Junjie
authors.initials: J
authors.lastname: Li
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Changzhi
authors.initials: C
authors.lastname: Gu
authors.affiliation: Key Laboratory of Advanced Micro-structure Materials (MOE) and School of Physics Science and Engineering, Tongji University, Shanghai 200092, China.
authors.forename: Hongqiang
authors.initials: H
authors.lastname: Li