title: Plasmon coupling in vertical split-ring resonator metamolecules.
abstract: The past decade has seen a number of interesting designs proposed and implemented to generate artificial magnetism at optical frequencies using plasmonic metamaterials, but owing to the planar configurations of typically fabricated metamolecules that make up the metamaterials, the magnetic response is mainly driven by the electric field of the incident electromagnetic wave. We recently fabricated vertical split-ring resonators (VSRRs) which behave as magnetic metamolecules sensitive to both incident electric and magnetic fields with stronger induced magnetic dipole moment upon excitation in comparison to planar SRRs. The fabrication technique enabled us to study the plasmon coupling between VSRRs that stand up side by side where the coupling strength can be precisely controlled by varying the gap in between. The resulting wide tuning range of these resonance modes offers the possibility of developing frequency selective functional devices such as sensors and filters based on plasmon coupling with high sensitivity.
authors.affiliation: Department of Physics, National Taiwan University, Taipei 10617, Taiwan.
authors.forename: Pin Chieh
authors.initials: PC
authors.lastname: Wu
authors.affiliation: Department of Physics, National Taiwan University, Taipei 10617, Taiwan.
authors.forename: Wei-Lun
authors.initials: WL
authors.lastname: Hsu
authors.affiliation: Department of Physics, National Taiwan University, Taipei 10617, Taiwan.
authors.forename: Wei Ting
authors.initials: WT
authors.lastname: Chen
authors.affiliation: Department of Physics, National Taiwan University, Taipei 10617, Taiwan.
authors.forename: Yao-Wei
authors.initials: YW
authors.lastname: Huang
authors.affiliation: Department of Physics, National Taiwan University, Taipei 10617, Taiwan.
authors.forename: Chun Yen
authors.initials: CY
authors.lastname: Liao
authors.affiliation: School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore.
authors.forename: Ai Qun
authors.initials: AQ
authors.lastname: Liu
authors.affiliation: Optoelectronics Research Centre and Centre for Photonic Metamaterials, University of Southampton, Southampton SO17 1BJ, UK.|TPI and Centre for Disruptive Photonic Technologies, Nanyang Technological University, Singapore 637371, Singapore.
authors.forename: Nikolay I
authors.initials: NI
authors.lastname: Zheludev
authors.affiliation: Department of Engineering, University of Massachusetts Boston, Boston, MA 02125, U.S.A.
authors.forename: Greg
authors.initials: G
authors.lastname: Sun
authors.affiliation: Department of Physics, National Taiwan University, Taipei 10617, Taiwan.|Research Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan.
authors.forename: Din Ping
authors.initials: DP
authors.lastname: Tsai